Data / Nonprofits / Connecticut / Greenwich
Nonprofits in Greenwich, CT: 570 registered with the IRS
570 nonprofits are registered with the IRS in Greenwich, CT, 511 of them 501(c)(3) charities; the 197 that report revenue took in $1.33 billion. The largest by revenue: Greenwich Hospital ($591.8 million), Greenwich Country Day School Inc ($139.7 million), Brunswick School Inc ($95.3 million). Most common causes: philanthropy, voluntarism and grantmaking foundations (132), education (50), arts, culture and humanities (47).
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The 500 largest by revenue
| Organization | Category | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Greenwich Hospital | Health care | 501(c)(3) | 1972 | $591.8 million | $910 million | 2025-09 |
| Greenwich Country Day School Inc | Education | 501(c)(3) | 1939 | $139.7 million | $457.4 million | 2025-06 |
| Brunswick School Inc | Education | 501(c)(3) | 1934 | $95.3 million | $509.6 million | 2025-06 |
| Greenwich Academy Inc | Education | 501(c)(3) | 1938 | $61 million | $326.3 million | 2025-06 |
| Abilis Inc | Mental health and crisis intervention | 501(c)(3) | 1954 | $44.1 million | $38.8 million | 2025-06 |
| Family Centers Inc | 501(c)(3) | 1955 | $34.6 million | $32.8 million | 2025-06 | |
| Greenwich Country Club | 501(c)(7) | 1968 | $25.6 million | $53.1 million | 2025-12 | |
| Eagle Hill Foundation Inc | Education | 501(c)(3) | 1984 | $24.5 million | $50.7 million | 2025-06 |
| Whitby School Inc | Education | 501(c)(3) | 1959 | $18.3 million | $35.2 million | 2025-06 |
| Burning Tree Country Club Inc | 501(c)(7) | 1965 | $18.1 million | $43.3 million | 2025-09 | |
| The Stanwich Club Incorporated | 501(c)(7) | 1965 | $17.6 million | $45.9 million | 2025-10 | |
| Round Hill Club Incorporated | 501(c)(7) | 1955 | $16.5 million | $27.4 million | 2024-12 | |
| Tamarack Country Club Inc | 501(c)(7) | 1942 | $16.5 million | $26.7 million | 2025-03 | |
| Fairview Country Club | 501(c)(7) | 1943 | $14.5 million | $12.9 million | 2024-12 | |
| YWCA Greenwich Connecticut Inc | Human services | 501(c)(3) | 1943 | $12.9 million | $24.5 million | 2025-06 |
| Boys & Girls Club of Greenwich Inc | Youth development | 501(c)(3) | 1945 | $11.4 million | $60.2 million | 2025-06 |
| Milbrook Club Inc | 501(c)(7) | 1942 | $10.1 million | $19.5 million | 2024-12 | |
| Belle Haven Club Inc | 501(c)(7) | 1970 | $9.9 million | $15.6 million | 2025-12 | |
| Young Mens Christian Assoc of Greenwich | Human services | 501(c)(3) | 1934 | $9.8 million | $34.7 million | 2025-12 |
| Field Club of Greenwich Inc | 501(c)(7) | 1955 | $9 million | $25.8 million | 2024-12 | |
| The Greenwich Hospital Endowment Fund | Health care | 501(c)(3) | 1998 | $8.7 million | $139 million | 2025-09 |
| Bruce Museum Inc | Arts, culture and humanities | 501(c)(3) | 1971 | $7.8 million | $96.2 million | 2025-06 |
| Garden Conservancy Inc | Environment | 501(c)(3) | 1990 | $7.7 million | $44.9 million | 2025-12 |
| Jewish Family Services of Greenwich Inc | 501(c)(3) | 1984 | $7.3 million | $2.9 million | 2024-12 | |
| Lyford Cay Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1969 | $7 million | $39.6 million | 2024-12 |
| Indian Harbor Yacht Club Inc | 501(c)(7) | 1942 | $6.8 million | $12.6 million | 2025-09 | |
| Jennings Terrace Inc | 501(c)(3) | 1951 | $6 million | $3.8 million | 2025-06 | |
| Putnam-Indian Field School Inc | Education | 501(c)(3) | 1951 | $5.2 million | $19.2 million | 2025-06 |
| Merry Go Round Inc | Housing and shelter | 501(c)(3) | 2003 | $5.2 million | $18.4 million | 2024-12 |
| Partnership To Address Global Emissions Inc | Arts, culture and humanities | 501(c)(6) | 2023 | $5 million | $208,761 | 2025-12 |
| Uja Federation of Greenwich Inc | 501(c)(3) | 1956 | $4.3 million | $5.4 million | 2024-12 | |
| Greenwich Library | Education | 501(c)(3) | 1943 | $3.6 million | $87.5 million | 2025-06 |
| Greenwich Skating Club Inc | 501(c)(7) | 1977 | $3.6 million | $6.7 million | 2026-04 | |
| Fibrolamellar Cancer Foundation | Diseases, disorders and medical disciplines | 501(c)(3) | 2010 | $3.4 million | $10.2 million | 2024-12 |
| Walking With Purpose Inc | 501(c)(3) | 2008 | $3.3 million | $2 million | 2025-04 | |
| Neighbor To Neighbor Inc | 501(c)(3) | 1948 | $3.3 million | $8.9 million | 2025-06 | |
| Pathways Inc | Mental health and crisis intervention | 501(c)(3) | 1982 | $2.8 million | $7.9 million | 2025-06 |
| United Way of Greenwich Inc | 501(c)(3) | 1941 | $2.8 million | $5.8 million | 2025-06 | |
| Breast Cancer Alliance Inc | Health care | 501(c)(3) | 1998 | $1.9 million | $3.2 million | 2026-03 |
| Town Hall Annex Corporation | 501(c)(4) | 1982 | $1.8 million | $13.7 million | 2024-12 | |
| Inclusive Abundance Initiative Inc | Public and societal benefit | 501(c)(3) | 2024 | $1.7 million | $439,438 | 2024-12 |
| Bailiwick Club Inc | 501(c)(7) | 1989 | $1.5 million | $3.4 million | 2025-12 | |
| Natalie Foundation | Health care | 501(c)(3) | 2024 | $1.5 million | $1.5 million | 2024-12 |
| Boy Scouts of America | Youth development | 501(c)(3) | 1965 | $1.5 million | $9.1 million | 2024-12 |
| Girls With Impact Inc | Education | 501(c)(3) | 2019 | $1.4 million | $1.1 million | 2025-07 |
| Roxbury Swim & Tennis Club Inc | 501(c)(7) | 1960 | $1.4 million | $2.6 million | 2025-12 | |
| Greenwich Ballet Academy Inc | Education | 501(c)(3) | 2007 | $1.3 million | $1.7 million | 2024-12 |
| Soldiers for the Truth Foundation | Education | 501(c)(3) | 1998 | $1.3 million | $1.4 million | 2024-12 |
| Round Hill Nursery School Inc | 501(c)(3) | 1968 | $1.3 million | $3.2 million | 2025-06 | |
| Stamford Youth Soccer League Inc | 501(c)(3) | 1979 | $1.2 million | $1.4 million | 2025-08 | |
| Greenwich Center for Hope & Renewal Inc | Human services | 501(c)(3) | 2007 | $1.2 million | $825,920 | 2025-06 |
| Adopt A Dog Inc | Animal-related | 501(c)(3) | 1982 | $1.1 million | $4 million | 2025-12 |
| The Greenwich Land Trust Inc | Environment | 501(c)(3) | 1977 | $1 million | $115 million | 2024-12 |
| Greenwich Alliance for Educationfoundation Inc | Education | 501(c)(3) | 2006 | $983,398 | $2 million | 2025-06 |
| Mill Reef Fund | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1950 | $951,422 | $1.1 million | 2025-12 |
| Pat-A-Cake Inc | Human services | 501(c)(3) | 2008 | $950,164 | $270,629 | 2024-12 |
| Hope for Poor Children Foundationincorporated | Human services | 501(c)(3) | 2006 | $945,543 | $9.2 million | 2024-12 |
| Greenwich Scholarship Association Inc | Education | 501(c)(3) | 1997 | $940,367 | $7.4 million | 2025-06 |
| Whamnow Inc | Human services | 501(c)(3) | 2021 | $926,291 | $689,560 | 2025-12 |
| Global Citizens Initiative Inc | Education | 501(c)(3) | 2014 | $918,931 | $655,309 | 2025-12 |
| Quarry Knoll II Corporation | Housing and shelter | 501(c)(4) | 1978 | $902,916 | $5.2 million | 2024-12 |
| Pi Lambda Phi Fraternity Inc | 501(c)(7) | 1941 | $853,921 | $1.3 million | 2025-08 | |
| The Uhnw Institute | Education | 501(c)(3) | 2019 | $818,581 | $35,745 | 2024-12 |
| Barbaras House Inc | 501(c)(3) | 1957 | $785,949 | $635,837 | 2025-06 | |
| Greenwich Christian Preschool Inc | Education | 501(c)(3) | 2014 | $754,410 | $756,209 | 2025-12 |
| Greenwich Symphony Orchestra Inc | Arts, culture and humanities | 501(c)(3) | 1959 | $730,131 | $2.2 million | 2025-06 |
| Coffee for Good Inc | Employment | 501(c)(3) | 2020 | $604,671 | $1.1 million | 2025-06 |
| Sharing Sacred Spaces Incorporated | Religion-related | 501(c)(3) | 2020 | $577,449 | $336,994 | 2025-06 |
| Parks & Recreation Foundation of the Town of Greenwich Connecticut | Recreation and sports | 501(c)(3) | 2002 | $574,673 | $310,244 | 2025-12 |
| Greenwich Youth Lacrosse Inc | Recreation and sports | 501(c)(3) | 1998 | $534,091 | $630,841 | 2024-12 |
| Impact 100 Fairfield County | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $493,474 | $558,620 | 2025-06 |
| Club Management Association of America Connecticut Chapter Inc | Community improvement and capacity building | 501(c)(6) | 2020 | $485,130 | $120,198 | 2025-10 |
| Ons Foundation for Clinical Research and Education Inc | Health care | 501(c)(3) | 2008 | $458,221 | $1.9 million | 2025-12 |
| Greenwich Riding & Trails Association Inc | 501(c)(3) | 1963 | $451,261 | $887,808 | 2024-12 | |
| Purposeful Growth Institute Inc | Education | 501(c)(3) | 2022 | $439,857 | $138,959 | 2025-12 |
| Open Arts Alliance Inc | Health care | 501(c)(3) | 2012 | $435,833 | $624,439 | 2025-06 |
| Amer Friends of the Archbishop of Cantrbrys Angl Communion Fund Inc | Religion-related | 501(c)(3) | 2000 | $431,739 | $1.7 million | 2024-12 |
| Volunteer Health Program LTD | Health care | 501(c)(3) | 1994 | $415,580 | $95,700 | 2025-06 |
| At Home in Greenwich Inc | Human services | 501(c)(3) | 2008 | $405,862 | $880,357 | 2025-06 |
| Silver Shield Association Inc | 501(c)(5) | 1984 | $404,384 | $1 million | 2024-06 | |
| Round Hill Volunteer Fire Company Incorporated | Public safety, disaster preparedness and relief | 501(c)(3) | 2023 | $397,694 | $1.7 million | 2025-04 |
| Backcountry Concerts Inc | Arts, culture and humanities | 501(c)(3) | 2007 | $386,745 | $158,139 | 2025-06 |
| Meals-On-Wheels Inc of Greenwich Connecticut | 501(c)(3) | 1966 | $384,840 | $1.4 million | 2025-09 | |
| Greenwich Choral Society Inc | Arts, culture and humanities | 501(c)(3) | 1957 | $372,629 | $629,083 | 2025-06 |
| Parkinsons Body and Mind Inc | Health care | 501(c)(3) | 2022 | $359,945 | $394,825 | 2024-12 |
| Abilis Community Foundation Inc | Human services | 501(c)(3) | 1997 | $350,180 | $7.8 million | 2025-06 |
| Alliance Francaise of Greenwich Inc | Arts, culture and humanities | 501(c)(3) | 1971 | $339,804 | $113,192 | 2025-07 |
| Greenwich Tree Conservancy Inc | Environment | 501(c)(3) | 2007 | $332,641 | $1.5 million | 2025-12 |
| Greenwich Arts Council Inc | Arts, culture and humanities | 501(c)(3) | 1973 | $328,339 | $584,946 | 2025-06 |
| Pathways Futures Inc | 501(c)(3) | 1989 | $326,955 | $756,222 | 2025-12 | |
| Committee To Reduce Infection Deaths Inc | Health care | 501(c)(3) | 2005 | $324,291 | $464,123 | 2025-09 |
| Greenwich Association of Realtors Inc | 501(c)(6) | 1968 | $319,770 | $1.2 million | 2024-12 | |
| Common Circles | Human services | 501(c)(3) | 2015 | $315,701 | $274,633 | 2024-12 |
| Junior League of Greenwich Conn Inc | Community improvement and capacity building | 501(c)(3) | 1961 | $315,639 | $2.4 million | 2025-06 |
| Friends of Nathaniel Witherell Inc | Public safety, disaster preparedness and relief | 501(c)(3) | 2006 | $300,929 | $675,959 | 2025-06 |
| Byram Archibald Neighborhood Center Trust Inc | 501(c)(3) | 1978 | $300,312 | $1.6 million | 2025-09 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $293,305 | $185,987 | 2025-06 | |
| Greenwich Cardinals Youth Hockey Association | 501(c)(3) | 1986 | $273,564 | $92,663 | 2025-06 | |
| Greenwich Chamber of Commerce Inc | 501(c)(6) | 1928 | $269,986 | $294,181 | 2025-12 | |
| Greenwich Art Society Inc | Arts, culture and humanities | 501(c)(3) | 1961 | $268,043 | $199,809 | 2025-08 |
| Connecticut Education Association | 501(c)(5) | 1971 | $251,432 | $400,527 | 2025-06 | |
| Friends of the Greenwich Senior Center Inc | Community improvement and capacity building | 501(c)(3) | 2010 | $249,644 | $5.7 million | 2025-08 |
| The Walkabout Foundation Inc | Medical research | 501(c)(3) | 2009 | $248,536 | $514,321 | 2025-12 |
| B More Incorporated | Medical research | 501(c)(3) | 2019 | $247,950 | $18,067 | 2025-12 |
| Greenwich Boat and Yacht Club Incorporated | 501(c)(7) | 1974 | $246,740 | $875,741 | 2025-12 | |
| Greenwich Basketball Association Inc | 501(c)(3) | 1995 | $229,987 | $349,747 | 2025-08 | |
| Heffter Research Institute | Science and technology | 501(c)(3) | 2021 | $228,716 | $490,260 | 2024-12 |
| International Association of Fire Fighters | 501(c)(5) | 1940 | $215,734 | $2.2 million | 2024-12 | |
| Garrett B Smith Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1995 | $212,351 | $1.7 million | 2025-12 |
| Greenwich Association of Realtors Community Foundation Inc | Community improvement and capacity building | 501(c)(3) | 2023 | $210,465 | $105,665 | 2024-12 |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $209,556 | $195,146 | 2026-06 | |
| Silver Shield Association Education Fund Inc | Education | 501(c)(3) | 2016 | $204,943 | $801,341 | 2025-06 |
| Bemc 4 Association | Civil rights, social action and advocacy | 501(c)(4) | 2022 | $204,001 | $2.7 million | 2024-12 |
| Danas Angels Research Trust | Diseases, disorders and medical disciplines | 501(c)(3) | 2003 | $195,953 | $759,986 | 2025-12 |
| Greenwich Department of Human Services Fund Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2018 | $195,328 | $395,780 | 2025-06 |
| Glenville Volunteer Fire Company No 1 Inc | Public safety, disaster preparedness and relief | 501(c)(3) | 2009 | $194,075 | $366,281 | 2025-12 |
| Glenville Child Care Inc | Human services | 501(c)(3) | 1995 | $193,501 | $63,547 | 2025-06 |
| Chamber Players of the Greenwich Symphony Inc | Arts, culture and humanities | 501(c)(3) | 2005 | $193,364 | $344,372 | 2025-06 |
| Pathways Vision Inc | Housing and shelter | 501(c)(3) | 2004 | $179,216 | $1.7 million | 2025-12 |
| Roundhill Scholarship Foundation Inc | Education | 501(c)(3) | 2013 | $160,704 | $289,260 | 2025-12 |
| Money Marketeers of New York University Inc | Education | 501(c)(7) | 1949 | $152,645 | $259,799 | 2025-12 |
| Ptsa Connecticut Inc | Education | 501(c)(3) | 1955 | $151,660 | $109,547 | 2025-06 |
| Cardinal Quarterback Club Inc | Recreation and sports | 501(c)(3) | 2014 | $145,693 | $44,026 | 2025-12 |
| Greenwich Catholic Education Trust Fund | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1971 | $145,017 | $4.1 million | 2026-06 |
| Feathers Project Inc | International, foreign affairs and national security | 501(c)(3) | 2016 | $142,171 | $89,173 | 2025-12 |
| Living Donor Support Foundation Inc | Diseases, disorders and medical disciplines | 501(c)(3) | 2023 | $133,328 | $1.5 million | 2024-06 |
| Greenwich Flag Football Association Inc | Recreation and sports | 501(c)(3) | 2025 | $125,000 | $5,598 | 2025-12 |
| Greenwich Green and Clean Inc | Environment | 501(c)(3) | 1987 | $124,449 | $438,254 | 2025-12 |
| American College of Healthcare Executives | Community improvement and capacity building | 501(c)(6) | 1983 | $123,991 | $161,998 | 2025-12 |
| Especially Everyone Inc | Arts, culture and humanities | 501(c)(3) | 2024 | $123,602 | $3,447 | 2024-12 |
| Ninth District Veteran Assoc Inc | Education | 501(c)(7) | 2024 | $123,582 | $101,617 | 2025-12 |
| Inclusive Abundance Action Inc | Civil rights, social action and advocacy | 501(c)(4) | 2024 | $120,267 | $102,861 | 2024-12 |
| Black Fives Foundation | Education | 501(c)(3) | 2014 | $120,168 | $167,933 | 2024-12 |
| Society of Cincinnati in the State of Connecticut | Arts, culture and humanities | 501(c)(3) | 1942 | $117,410 | $1.4 million | 2024-05 |
| Greenwich Girls Flag Football Inc | Youth development | 501(c)(3) | 2025 | $116,145 | $14,111 | 2025-12 |
| Heartbeat International Ministries Inc | Human services | 501(c)(3) | 2019 | $113,945 | $194,484 | 2025-12 |
| Columbia Business School Club of Ny Inc | Education | 501(c)(3) | 1979 | $109,548 | $609,473 | 2025-05 |
| Laborers International Union of North America | 501(c)(5) | 1968 | $109,462 | $116,035 | 2024-12 | |
| Womans Club of Greenwich Inc | 501(c)(3) | 1967 | $108,198 | $769,471 | 2025-05 | |
| Greenwich Chaplaincy Services Inc | Health care | 501(c)(3) | 1968 | $105,445 | $139,568 | 2024-12 |
| Greenwich Police Dept Scholarship Fund Inc Greenwich Police Dept | Education | 501(c)(3) | 1963 | $100,690 | $628,091 | 2024-12 |
| Indian Harbor Yacht Club Foundation Inc | Arts, culture and humanities | 501(c)(3) | 2011 | $96,808 | $741,480 | 2025-09 |
| Call A Ride of Greenwich | Community improvement and capacity building | 501(c)(3) | 1992 | $94,533 | $689,029 | 2025-06 |
| Beljanski Foundation Inc | Science and technology | 501(c)(3) | 2001 | $94,093 | $659,871 | 2024-12 |
| Mothers for Others Inc | Human services | 501(c)(3) | 2017 | $91,000 | $54,416 | 2024-12 |
| VWM Families Foundation Inc | Diseases, disorders and medical disciplines | 501(c)(3) | 2016 | $89,400 | $68,173 | 2025-12 |
| Ready To Empower Inc | International, foreign affairs and national security | 501(c)(3) | 2014 | $88,389 | $26,812 | 2025-12 |
| Ptsa Connecticut Inc | 501(c)(3) | 1995 | $88,133 | $124,368 | 2025-06 | |
| Pitch in for Puerto Rico Inc | Recreation and sports | 501(c)(3) | 2023 | $83,000 | $2,306 | 2025-12 |
| Triumph Fund Inc | Recreation and sports | 501(c)(3) | 2024 | $76,197 | $22,999 | 2024-12 |
| Knights of Columbus | 501(c)(8) | 1940 | $72,205 | $214,733 | 2025-12 | |
| Greenwich Municipal Employees Association Inc | Employment | 501(c)(5) | 1990 | $69,792 | $408,207 | 2025-06 |
| Friends of Briland Aid Inc | International, foreign affairs and national security | 501(c)(3) | 2020 | $69,300 | $9,239 | 2025-12 |
| Retired Mens Association of Greenwich Inc | Recreation and sports | 501(c)(7) | 2014 | $68,942 | $78,760 | 2026-04 |
| William B Nollman Memorial Caddy Scholarship Fund Inc | Education | 501(c)(3) | 2016 | $68,741 | $71,625 | 2025-12 |
| Hortulus Inc | Environment | 501(c)(3) | 1967 | $68,345 | $284,027 | 2026-06 |
| Federated Garden Clubs of Connecticut Inc | Environment | 501(c)(3) | 1967 | $68,039 | $295,624 | 2025-06 |
| Federated Garden Clubs of Connecticut Inc | Environment | 501(c)(3) | 1967 | $66,526 | $202,984 | 2025-06 |
| Amogerone Fire Co 1 Inc | Public safety, disaster preparedness and relief | 501(c)(3) | 2002 | $64,161 | $832,142 | 2025-06 |
| Byram Shore Boat Club Inc C/o Byram Park | 501(c)(7) | 1994 | $62,407 | $73,823 | 2024-12 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $62,365 | $23,124 | 2025-06 | |
| Banksville Community House Inc | 501(c)(3) | 1955 | $59,976 | $52,750 | 2025-12 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $57,007 | $140,826 | 2025-06 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $55,607 | $166,029 | 2026-06 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $54,657 | $155,880 | 2025-06 | |
| Hawthorne Beach Maintenance Assoc Inc | 501(c)(7) | 1990 | $53,000 | $69,031 | 2024-12 | |
| Greenwich Exchange for Womens Work Inc | Human services | 501(c)(3) | 1937 | $52,913 | $124,572 | 2024-03 |
| Circularity Project Inc | Arts, culture and humanities | 501(c)(3) | 2024 | $50,949 | $60,852 | 2025-12 |
| Bush Cup Corp | Recreation and sports | 501(c)(3) | 2016 | $46,500 | $9,886 | 2025-12 |
| Glenville Mavericks Inc | Recreation and sports | 501(c)(3) | 2014 | $46,391 | $59,385 | 2025-12 |
| B Cured Inc | Diseases, disorders and medical disciplines | 501(c)(3) | 2008 | $46,103 | $74,680 | 2025-12 |
| Parsonage Cottage Home for the Aged Inc | Housing and shelter | 501(c)(3) | 1994 | $42,517 | $275,238 | 2025-12 |
| Association of Divorce Financial Planners Inc | Community improvement and capacity building | 501(c)(6) | 2017 | $40,730 | $103,588 | 2025-12 |
| Slovak Heritage Festival | Arts, culture and humanities | 501(c)(3) | 2024 | $39,691 | $5,690 | 2025-12 |
| Israel Putnam House Association of Connecticut Inc | 501(c)(3) | 1974 | $38,107 | $64,637 | 2026-02 | |
| Dartmouth Lawyers Association | 501(c)(6) | 1985 | $33,621 | $326,838 | 2026-04 | |
| Metropolitan New York Association for Applied Psychology | 501(c)(3) | 1971 | $32,771 | $89,129 | 2025-07 | |
| Sos Eb Kids Corp | Health care | 501(c)(3) | 2015 | $27,461 | $128,238 | 2025-12 |
| Greenwich Community Gardens | Food, agriculture and nutrition | 501(c)(3) | 2012 | $25,511 | $128,537 | 2025-12 |
| National Society of the Daughters of the American Revolution | Arts, culture and humanities | 501(c)(3) | 1938 | $24,193 | $107,475 | 2026-02 |
| Catholic Parish Initiatives Inc | Religion-related | 501(c)(3) | 2024 | $17,715 | $35,806 | 2025-12 |
| Byram Veterans Association Inc | 501(c)(4) | 1963 | $14,741 | $95,374 | 2026-02 | |
| Sweet Blue Foundation | Recreation and sports | 501(c)(3) | 2024 | $14,000 | $5,272 | 2025-12 |
| Stamford Junior Wrestling Club Inc | Recreation and sports | 501(c)(3) | 2009 | $13,294 | $58,216 | 2024-08 |
| Williams Syndrome Charitable Foundation USA Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $9,049 | $4,701 | 2024-12 |
| Greenwich Heritage Foundation Inc | Arts, culture and humanities | 501(c)(3) | 2010 | $8,918 | $10,216 | 2025-06 |
| GHS Band Boosters Inc | Education | 501(c)(3) | 2010 | $8,097 | $53,944 | 2026-06 |
| Ahlan-Ny | Community improvement and capacity building | 501(c)(3) | 2023 | $7,025 | $14,349 | 2025-12 |
| Citizens Policy Forum of Connecticut | Public and societal benefit | 501(c)(3) | 2023 | $5,000 | $16,472 | 2025-12 |
| Leaders of the Next Generation Inc | Education | 501(c)(3) | 2024 | $4,604 | $3,395 | 2024-12 |
| Leadership Exchange | International, foreign affairs and national security | 501(c)(3) | 2013 | $3,831 | $9,709 | 2024-12 |
| Wonder Walls Inc | Public and societal benefit | 501(c)(3) | 2017 | $2,001 | $1,646 | 2025-12 |
| Challenged People in Motion Inc | Human services | 501(c)(3) | 2002 | $1,300 | $15,611 | 2024-12 |
| Stanwich Club Inc Supplemental Unemployment Benefits Plan & Trust | Mutual and membership benefit | 501(c)(17) | 2022 | $1,000 | $2,671 | 2024-12 |
| Shahgustafsson Foundation | Community improvement and capacity building | 501(c)(3) | 2025 | $714 | $52,507 | 2023-12 |
| Helene Urfirer Memorial Literacy Fund Inc | Arts, culture and humanities | 501(c)(3) | 1998 | $566 | $30,310 | 2025-12 |
| Guberti Giving Inc | Youth development | 501(c)(3) | 2018 | $150 | $1 | 2025-12 |
| 9-11 Legacy Foundation Inc | Arts, culture and humanities | 501(c)(3) | 2025 | $0 | $0 | 2026-06 |
| A & C de Coster Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2021 | $9.8 million | 2026-01 | |
| Aaib Inc | 501(c)(4) | 1969 | $0 | $0 | 2025-12 | |
| Aaron and Betty Lee Stern Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2010 | $3.4 million | 2025-12 | |
| Accesscircles Inc | Human services | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Adventures in Astronomy Inc | Science and technology | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Alec and Tamar Ellison Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $411,187 | 2025-12 | |
| Alexander Host Foundation Inc | 501(c)(3) | 1985 | $2.3 million | 2025-12 | ||
| Alfa Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $24.1 million | 2025-12 | |
| Allen Museum of Art | Arts, culture and humanities | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Allen Research Endowment Inc | 501(c)(3) | 2018 | $112,130 | 2025-12 | ||
| Allwin Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1997 | $1,877 | 2025-12 | |
| Alpha-Omega Charitable Foundation Inc | 501(c)(3) | 1994 | $5.3 million | 2025-12 | ||
| Alumni Association of Psi Chapter of Psi Upsilon Inc | Recreation and sports | 501(c)(7) | 2025 | $0 | $0 | 2026-06 |
| American Contract Bridge League Unit 126 Inc | 501(c)(7) | 1986 | $0 | $0 | 2025-12 | |
| American Friends of Teatro Alla Scala Inc | Arts, culture and humanities | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| American Hot Rod Foundation Inc | Arts, culture and humanities | 501(c)(3) | 2003 | $409,884 | 2025-12 | |
| American Legion | 501(c)(19) | 1946 | $0 | $0 | 2025-12 | |
| Anantaa-Om Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $28.1 million | 2024-12 | |
| Angel Choir | Arts, culture and humanities | 501(c)(3) | 2011 | $0 | $0 | 2024-12 |
| Anikstein Family Fund Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $2.4 million | 2024-12 | |
| Animal Rescue Flights | Animal-related | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Anne Li McGraw and Charles Robert McGraw Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2019 | $1 | 2025-12 | |
| Ansell Family Foundation Inc | Health care | 501(c)(3) | 2017 | $33,793 | 2024-12 | |
| Aphrodite & Peter Skeadas Charitable Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | |||
| Arora Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2007 | $3.2 million | 2025-12 | |
| Ask Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $55,932 | 2025-12 | |
| August Family Foundation Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $2,027 | 2024-12 | |
| Azcat Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $66.2 million | 2025-12 | |
| Bar Association of Greenwich Inc | 501(c)(6) | 1994 | $0 | $0 | 2024-12 | |
| Barbara and Gary Brandt Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $2.8 million | 2024-12 | |
| Beba Innovation and Entrepreneurship Foundation Inc | International, foreign affairs and national security | 501(c)(3) | 2019 | $2.1 million | 2024-12 | |
| Bel Canto Society Inc | Arts, culture and humanities | 501(c)(3) | 1987 | $0 | $0 | 2025-03 |
| Bemc Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2021 | $33.4 million | 2024-12 | |
| Berkley Foundation for Historical Books and Documents | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | $100 million | 2024-12 | |
| Berrien House Trust | Education | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Big Day Gifts | Human services | 501(c)(3) | 2016 | $0 | $1 | 2025-12 |
| Bimah Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2012 | $14.5 million | 2024-12 | |
| Black IV Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2019 | $1.2 million | 2025-12 | |
| Blessed Dressed Inc | Religion-related | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Blue Knights CT VII | 501(c)(10) | 1989 | $0 | $0 | 2025-12 | |
| Bondi Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1999 | $7 million | 2025-12 | |
| Brant Foundation Inc | Arts, culture and humanities | 501(c)(3) | 1998 | $94.6 million | 2024-12 | |
| Braver Foundation Inc | 501(c)(3) | 1968 | $32,349 | 2025-12 | ||
| Brille Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2005 | $83,691 | 2025-12 | |
| Bristol Blues | Recreation and sports | 501(c)(3) | 2022 | $4,013 | 2024-12 | |
| Brookfield Burke Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $205,549 | 2025-12 | |
| Brotherhood of Railroad Signalmen | Employment | 501(c)(5) | 1941 | $0 | $0 | 2025-12 |
| Brucato Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2021 | $7,282 | 2025-12 | |
| Bruised Camel Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2013 | $813,668 | 2024-12 | |
| Buddy White Project Inc | Education | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Burn Support Bangladesh Inc | Health care | 501(c)(3) | 2024 | $0 | $0 | 2023-12 |
| Bursky Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | $25.3 million | 2024-12 | |
| Business Insurance Foundation Inc | Employment | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Byram Neighborhood Association Corp | Community improvement and capacity building | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Byram Volunteer Fire Department Inc | Public safety, disaster preparedness and relief | 501(c)(3) | 2026 | $0 | $0 | 2021-12 |
| C S Craig Fam Foundation Inc | Education | 501(c)(3) | 1998 | $519,453 | 2026-04 | |
| Calf Island Foundation | 501(c)(3) | 1988 | $171,640 | 2025-01 | ||
| Cameron Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $564,227 | 2025-09 | |
| Candidate Development Training Inc | Public and societal benefit | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Caplan Fam Foundation Trust Agreement 102700 | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $478,968 | 2024-12 | |
| Carl & Dorothy Bennett Foundation Inc | 501(c)(3) | 1963 | $18.4 million | 2025-06 | ||
| Carl Forstmann Memorial Foundation | Education | 501(c)(3) | 2023 | $1.1 million | 2025-12 | |
| Casa Club the Spanish School | Education | 501(c)(3) | 2025 | $0 | $0 | 2025-06 |
| Center for Contemporary Domentation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2023 | $105,327 | 2025-12 | |
| Centro Espirita Gotinha de Luz | Religion-related | 501(c)(3) | 2017 | |||
| Chabad Lubavitch of Connecticut Inc | Religion-related | 501(c)(3) | 2021 | |||
| Chabad Lubavitch of Greenwich Inc | Religion-related | 501(c)(3) | 2002 | |||
| Chantecaille Family Foundation | Environment | 501(c)(3) | 2022 | $154.4 million | 2024-12 | |
| Christ Episcopal Church | 501(c)(3) | 1944 | ||||
| College Help and Individual Needs | Public and societal benefit | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Combined Organization of Police | 501(c)(3) | 1992 | $0 | $0 | 2025-12 | |
| Community Concerts of Greenwich Inc | Arts, culture and humanities | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Concerned Homeowners of Greenwich | Community improvement and capacity building | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Connecticut Book Festivals Inc | Recreation and sports | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Connecticut State Rifle & Revolver Association Inc | Recreation and sports | 501(c)(3) | 2003 | $0 | $0 | 2025-09 |
| Convent of the Sacred Heart | 501(c)(3) | 1946 | ||||
| Curry Classic Corp | Education | 501(c)(3) | 2024 | |||
| Dahesh Museum of Art | 501(c)(3) | 1988 | $43.9 million | 2025-05 | ||
| Dartmouth Free Speech Alliance Inc | Education | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| David & Karen Pecker Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $5.5 million | 2024-12 | |
| David and Caole Caplan Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2011 | $4 million | 2024-12 | |
| Dellora A & Lester J Norris Foundation | 501(c)(3) | 1980 | $33.9 million | 2025-12 | ||
| Derek and Leora Kaufman Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2019 | $1.3 million | 2024-12 | |
| Dollars To Scholars Inc | Education | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Domina Nostra Viae Association | Religion-related | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Dorsky Gallery Curatorial Programs | Arts, culture and humanities | 501(c)(3) | 2002 | $455,608 | 2025-06 | |
| Dr Joseph J Lawrence Trust | 501(c)(3) | 1953 | $319,332 | 2025-12 | ||
| E Matilda Ziegler FDN for the Blind | 501(c)(3) | 1936 | $10.3 million | 2024-12 | ||
| Edward John Noble Foundation Inc | 501(c)(3) | 1981 | $121 million | 2024-12 | ||
| Eleanor A Campbell Charitable Fund | Education | 501(c)(3) | 2025 | $860,633 | 2023-05 | |
| Elinor Patterson Baker Foundation | 501(c)(3) | 1986 | $51.7 million | 2025-05 | ||
| Ellen and Gary Davis Foundation | 501(c)(3) | 1993 | $3.4 million | 2024-12 | ||
| Emerald Society of the Police Dept Town of Greenwich CT the | 501(c)(7) | 1978 | $0 | $0 | 2023-11 | |
| Emwiga Foundation | 501(c)(3) | 1986 | $14 million | 2026-02 | ||
| Enhanced Geothermal Systems Deployment Coalition Inc | Community improvement and capacity building | 501(c)(6) | 2025 | |||
| Enthoven Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $372,933 | 2025-06 | |
| Entre Todos Co | 501(c)(3) | 2005 | $0 | $0 | 2025-12 | |
| Equanimitas Health Foundation Inc | Medical research | 501(c)(3) | 2025 | |||
| Eyecare From the Heart Inc | Health care | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| FMR Wellness Foundation | Health care | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Family First in Education Inc | Education | 501(c)(3) | 2019 | $36,472 | 2025-12 | |
| Federated Garden Clubs of Connecticut Inc | 501(c)(3) | 1967 | $0 | $0 | 2025-05 | |
| Federated Garden Clubs of Connecticut Inc | 501(c)(3) | 1967 | $0 | $0 | 2026-04 | |
| Feinberg Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $2 million | 2025-12 | |
| Filipino Womens Club of Connecticut Incorporated | Youth development | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Finninsula Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2000 | $452,051 | 2025-05 | |
| First Baptist Church | 501(c)(3) | 1991 | ||||
| First Church of Round Hill Inc | 501(c)(3) | 1974 | ||||
| First Lutheran Church | 501(c)(3) | 1941 | ||||
| Floren Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $2.7 million | 2025-10 | |
| Flower Petals Adaptive Dance Company | Arts, culture and humanities | 501(c)(3) | 2022 | $0 | $0 | 2025-06 |
| Food Access Network | Food, agriculture and nutrition | 501(c)(3) | 2024 | $0 | $1 | 2024-12 |
| Foundation of Hope | Human services | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Frascella Family Foundationcorporation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2007 | $692,996 | 2024-12 | |
| Fred J Epstein Pediatric Carefoundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2009 | $47,076 | 2025-06 | |
| GHS Water Polo Boosters Inc | Education | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Gateway Classical Music Society Inc | Arts, culture and humanities | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Gateway Classical Music Society of New York | Arts, culture and humanities | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Georges Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1999 | $376,840 | 2025-12 | |
| Gilbert Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2003 | $26,739 | 2024-12 | |
| Girlgolf Inc | Recreation and sports | 501(c)(3) | 2023 | $0 | $0 | 2026-06 |
| Giving Through Smiles Inc | International, foreign affairs and national security | 501(c)(3) | 2011 | $0 | $41,653 | 2025-12 |
| Golden Lights Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $0 | $0 | 2025-01 |
| Gosin Fam Foundation Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $5.4 million | 2025-12 | |
| Grace Church of Greenwich | Religion-related | 501(c)(3) | 1996 | |||
| Great Inner City Schools Inc | Education | 501(c)(4) | 2005 | $0 | $0 | 2025-12 |
| Greenwich Catholic Elementary School LLC | 501(c)(3) | 1946 | ||||
| Greenwich Catholic School | 501(c)(3) | 1971 | ||||
| Greenwich Catholic School Inc | 501(c)(3) | 1946 | ||||
| Greenwich Dental Society Inc | Community improvement and capacity building | 501(c)(6) | 2014 | $0 | $0 | 2023-12 |
| Greenwich Distinguished Teachers Award Committee Inc | Education | 501(c)(3) | 1986 | $0 | $0 | 2024-06 |
| Greenwich Flag Football Inc | Youth development | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Greenwich Forward Inc | Public and societal benefit | 501(c)(3) | 2019 | $0 | $0 | 2026-06 |
| Greenwich Girls Rugby | Recreation and sports | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Greenwich Neurological Institute Inc | Diseases, disorders and medical disciplines | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Greenwich Preservation Trust Inc | Arts, culture and humanities | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Greenwich Professional Firefighters Benevolent Fund Inc | Public and societal benefit | 501(c)(3) | 2014 | $0 | $0 | 2024-12 |
| Greenwich Public Schools Honor Choir Booster Club Inc | Arts, culture and humanities | 501(c)(3) | 2012 | $0 | $0 | 2023-06 |
| Greenwich Retirees Eating & Tarrying Society | 501(c)(3) | 1989 | $0 | $0 | 2026-04 | |
| Greenwich Track and Field Club Inc | Recreation and sports | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Griff Harris Mens Golf Club | Recreation and sports | 501(c)(7) | 2014 | $0 | $0 | 2024-12 |
| Grip Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $9,050 | 2025-12 | |
| Gusti Brandt Foundation | 501(c)(3) | 1950 | $2.5 million | 2024-12 | ||
| Happy Birthday Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2020 | $25,351 | 2025-12 | |
| Harteveldt Foundation Inc | 501(c)(3) | 1946 | $2.2 million | 2025-11 | ||
| Hartong Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2023 | $5.9 million | 2025-12 | |
| Harvest Time Assembly of God | 501(c)(3) | 1964 | ||||
| Hazels House Rescue Inc | Animal-related | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Heaven On Earth Charitable Foundati On | Arts, culture and humanities | 501(c)(3) | 2026 | |||
| Huminus Foundation | Education | 501(c)(3) | 2026 | |||
| Ianniello Family Charitable Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2020 | $2.5 million | 2025-12 | |
| If Hummingbird Foundation Inc | 501(c)(3) | 1992 | $3.5 million | 2025-06 | ||
| Iftikar Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2012 | $7,184 | 2025-09 | |
| Iglesia Casa Del Alfarero | Religion-related | 501(c)(3) | 2009 | |||
| Iglesia Hispana Tiempo de Cosecha Inc | Religion-related | 501(c)(3) | 2005 | |||
| Institute for Life Coping Skills Incorporated | Employment | 501(c)(3) | 1974 | $0 | $0 | 2025-12 |
| Isaac Ziering Foundation Inc | 501(c)(3) | 1987 | $962,055 | 2024-12 | ||
| Iva Inc | Youth development | 501(c)(3) | 2026 | |||
| Ivanhoe Charitable Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2018 | $1,770 | 2024-12 | |
| JDJ Charitable Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2002 | $962,708 | 2025-06 | |
| James and Sophie Zimmerman Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2021 | $129,200 | 2023-09 | |
| Jane and Daniel Och Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2009 | $570.1 million | 2024-12 | |
| Jesse Bayer Foundation | 501(c)(3) | 1987 | $86,118 | 2025-12 | ||
| Johan Santana Foundation | 501(c)(3) | 2010 | $0 | $0 | 2025-04 | |
| Johnson-Stillman Family Foundation Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1996 | $6 million | 2024-12 | |
| Jon & Kathy Savitz Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2000 | $1.5 million | 2025-10 | |
| Jones Foundation Inc | Arts, culture and humanities | 501(c)(3) | 1996 | $524 | 2025-09 | |
| Joseph and Claire Morrow Charitable Foundation | 501(c)(3) | 1994 | $2.3 million | 2025-06 | ||
| Kanarek Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2007 | $958,675 | 2025-06 | |
| Kasama Crinkles Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Keefe Family Foundation | 501(c)(3) | 1989 | $4.4 million | 2025-12 | ||
| Kim and Martin Sands Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2018 | $213,123 | 2024-12 | |
| Kirmar Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $3.4 million | 2024-12 | |
| Kozlowski Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $75,295 | 2025-12 | |
| Kurzrok Foundation Inc | 501(c)(3) | 1993 | $1.1 million | 2025-10 | ||
| La Leche League International Inc | 501(c)(3) | 1979 | $0 | $0 | 2026-03 | |
| Lady Cards Golf Inc | Education | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Langford Foundation | 501(c)(3) | 1984 | $54,882 | 2025-10 | ||
| League of Women Voters of Connecticut Inc | 501(c)(4) | 1964 | $0 | $0 | 2023-06 | |
| League of Women Voters of Greenwich Inc | 501(c)(3) | 1971 | $0 | $0 | 2025-06 | |
| Lehrman Institute | 501(c)(3) | 1972 | $143,319 | 2025-07 | ||
| Lenore & Howard Klein Foundation Inc | 501(c)(3) | 1992 | $2.7 million | 2024-12 | ||
| Limpe Foundation | 501(c)(3) | 1992 | $569,809 | 2025-12 | ||
| Little Wings Foundation Inc | Human services | 501(c)(3) | 2009 | $0 | $0 | 2024-12 |
| Living Science Center Foundation | Health care | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Lone Pine Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2002 | $58.6 million | 2024-12 | |
| Louis & Virginia Clemente Foundation Inc | 501(c)(3) | 1975 | $3 million | 2025-12 | ||
| Lucky Dog Refuge Inc | Animal-related | 501(c)(3) | 2020 | $210,818 | 2024-12 | |
| Ludecus Press | Arts, culture and humanities | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Luke Harkness Memorial Fund | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $0 | $0 | 2024-12 |
| Magnaverde Foundation Inc | Environment | 501(c)(3) | 1996 | $47,876 | 2025-12 | |
| Marie Fauth Charitable Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2005 | $6.9 million | 2025-09 | |
| Marsha Lilien Gladstein Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2000 | $12.8 million | 2025-12 | |
| Martin V Alonzo Foundation | Education | 501(c)(3) | 2008 | $421,456 | 2025-10 | |
| Massive Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | $847,914 | 2024-12 | |
| Math and Ai 4 Girls Inc | Education | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Mattis Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2005 | $3.4 million | 2025-12 | |
| Mattis Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $336,536 | 2025-12 | |
| Maurice J & Jane M Cunniffe Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1996 | $960,204 | 2025-12 | |
| Mayer Family Foundation | 501(c)(3) | 1990 | $3.6 million | 2025-12 | ||
| McAvity Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2009 | $4.1 million | 2024-12 | |
| Menstrual Hygiene Equity Project | Human services | 501(c)(3) | 2026 | |||
| Mervat Zahid Cultural Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2014 | $10.1 million | 2024-12 | |
| Metropoulos Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2020 | $2.6 million | 2025-12 | |
| Michael Whittingham Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2023 | $835,388 | 2025-12 | |
| Michael and Carol Lowenstein Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2009 | $89.4 million | 2025-10 | |
| Mile 26 Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $1.7 million | 2025-12 | |
| Moms Club | Human services | 501(c)(3) | 2001 | $0 | $0 | 2026-06 |
| Morris S & Florence H Bender Foundation Inc | 501(c)(3) | 1978 | $2.9 million | 2025-06 | ||
| Mountain Laurel Drive Owners Association Inc | 501(c)(4) | 1992 | $0 | $0 | 2025-12 | |
| Mulberry Essence Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2016 | $49.7 million | 2024-12 | |
| Nancy S Offit Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $22,946 | 2025-12 | |
| National Association of Guardsmen Inc | 501(c)(7) | 1982 | 2024-12 | |||
| National Association of Letter Carriers | 501(c)(5) | 1944 | $0 | $0 | 2025-12 | |
| National League of Young Men Inc | Human services | 501(c)(3) | 2010 | $0 | $0 | 2024-06 |
| National Society of the Children of the American Revolution | 501(c)(3) | 1973 | $0 | $0 | 2026-02 | |
| National Society of the Daughters of the American Revolution | 501(c)(3) | 1949 | $0 | $0 | 2024-12 | |
| National Sorority of Phi Delta Kappa | 501(c)(3) | 1976 | $0 | $0 | 2025-06 | |
| New Rochelle Aquatic Club Inc | Recreation and sports | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| New York Grand Opera | Arts, culture and humanities | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Noroton Wrestling Inc | Education | 501(c)(3) | 2024 | |||
| North Greenwich Congregational Church | 501(c)(3) | 1968 | ||||
| Nourish Now Foundation Inc | Health care | 501(c)(3) | 2026 | |||
| Nuevo Amanecer | Religion-related | 501(c)(3) | 1964 | |||
| Oak Tree Inc | Housing and shelter | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Oakmere Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $490,309 | 2025-12 | |
| Oconnell Family Foundation Inc | 501(c)(3) | 1994 | $2.4 million | 2024-12 | ||
| Ohnell Family Foundation | 501(c)(3) | 1993 | $6.8 million | 2025-12 | ||
| Orfeo Project | Arts, culture and humanities | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Outbox Education Inc | Civil rights, social action and advocacy | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Page Not Found | Education | 501(c)(3) | 2026 | |||
| Palladium Musicum Inc | Arts, culture and humanities | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Pamela Posen Memorial Fund | Education | 501(c)(3) | 1991 | $41,617 | 2024-12 | |
| Pan University Jewish Action Coalition Inc | Education | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Panwy Foundation Inc | 501(c)(3) | 1989 | $3.3 million | 2024-12 | ||
| Peak Wellness Foundation Incorporated | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $56 | 2025-12 | |
| Pemberwick Glenville Association Inc | Environment | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Permanent Commission On the Status of Women in CT Education Fund Inc | Civil rights, social action and advocacy | 501(c)(3) | 2018 | $0 | $0 | 2025-06 |
| Permanent Commission On the Status of Women in Connecticut Inc | 501(c)(4) | 2018 | $0 | $0 | 2025-06 | |
| Perryridge Corporation | Health care | 501(c)(3) | 1989 | $0 | $1.1 million | 2025-09 |
| Plepler Family Foundation | 501(c)(3) | 2026 | $1 | 2024-12 | ||
| Pohly Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $2.3 million | 2025-12 | |
| Ponderosa Drive Homeowners Association Inc | Housing and shelter | 501(c)(4) | 2014 | $0 | $0 | 2025-12 |
| Prabhu Family Foundation | Community improvement and capacity building | 501(c)(3) | 2012 | $5.8 million | 2024-12 | |
| Professor Enoka Rukare Scholarship Foundation | Arts, culture and humanities | 501(c)(3) | 2024 | |||
| Proust Society of Greenwich | Arts, culture and humanities | 501(c)(3) | 2016 | $0 | $0 | 2024-12 |
| Ptsa Connecticut Inc | 501(c)(3) | 1979 | $0 | $0 | 2025-06 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $0 | $0 | 2026-06 | |
| Quill Entertainment Company | Arts, culture and humanities | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| RHR Charitable Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $4 million | 2025-12 | |
| RLB League Inc | Youth development | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Raymond Falk Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $6.3 million | 2025-12 | |
| Redbird Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $1 | 2025-12 | |
| Redress Inc | Employment | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Resonance Horsemanship Inc | Animal-related | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Richard Paul and Ellen S Richman Private Family Foundation Trust Agre | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2009 | $107,649 | 2025-12 | |
| Riversville Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2001 | $35.9 million | 2024-12 | |
| Road Runners Club of America | 501(c)(3) | 1976 | $0 | $0 | 2025-12 | |
| Robert E Enslein Foundation Inc | 501(c)(3) | 1968 | $328,979 | 2026-06 | ||
| Robert G Burton Charitable Foundation | 501(c)(3) | 1993 | $580,078 | 2025-06 | ||
| Robert W Matschullat Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2002 | $781 | 2025-12 | |
| Ronald N Dubin Foundation | 501(c)(3) | 1992 | $326,423 | 2025-12 | ||
| Rosencrans Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $340,024 | 2025-12 | |
| Rouhana Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1997 | $501 | 2025-11 | |
| Round Hill Association Inc | Community improvement and capacity building | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Round Hill Cemetery Association Inc | 501(c)(13) | 1982 | $0 | $0 | 2025-12 | |
| Round Hill Community Church Inc | 501(c)(3) | 1978 | 2025-12 | |||
| Round Hill Preservation Society Inc | Arts, culture and humanities | 501(c)(3) | 2026 | |||
| Rowamerica Bridgeport Inc | Recreation and sports | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Rowamerica Pittsburgh Inc | Recreation and sports | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Royce Family Fund Inc | 501(c)(3) | 1986 | $97.4 million | 2024-12 | ||
| Russel R Taylor Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1997 | $2.6 million | 2025-04 | |
| Russell Maguire Foundation Inc | 501(c)(3) | 1941 | $2.6 million | 2025-12 | ||
| Ruth Lloyd Trust Uw Fbo Metro Museum of Art | 501(c)(3) | 1986 | $5.6 million | 2026-02 | ||
| Ruth W Brown Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1995 | $1.9 million | 2025-12 | |
| Rutledge Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2016 | $43.5 million | 2025-11 | |
| S & L Marx Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $83.1 million | 2024-12 | |
| Sacred Heart Church | 501(c)(3) | 1946 | ||||
| Saint Marys Roman Catholic Church | 501(c)(3) | 1946 | 2014-06 | |||
| Saint Michael Roman Catholic Church Corporation | 501(c)(3) | 1946 | 2014-06 | |||
| Saint Paul Lutheran Church | 501(c)(3) | 1941 | ||||
| Santoro Family Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $87,090 | 2025-12 | |
| Sarah Bodman Greenhill Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2023 | $790,327 | 2025-12 | |
| Schiele Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2000 | $15,392 | 2024-12 | |
| Schwarz Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $204,023 | 2025-12 | |
| Selander Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2005 | $35.3 million | 2024-11 | |
| Self Care for Recovery | Mental health and crisis intervention | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Serenity Hour Fellowship | Religion-related | 501(c)(3) | 2024 | |||
| Seven Bridges Foundation Inc | Arts, culture and humanities | 501(c)(3) | 1998 | $61.4 million | 2025-09 | |
| Sheldon and Marilyn Fireman Familyfoundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $1 | 2024-12 | |
| Silverbird 29 Fund | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2018 | $16.7 million | 2024-12 | |
| Simmons Family Foundation Inc | 501(c)(3) | 1994 | $4.1 million | 2025-12 | ||
| Simpson Lighthouse Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2019 | $508,663 | 2024-12 | |
| Sleepy Cat Farm Foundation | Arts, culture and humanities | 501(c)(3) | 2016 | $1.8 million | 2025-12 | |
| Smith College Club of Greenwich Smith College Club of Greenwich & | 501(c)(3) | 1966 | $0 | $0 | 2025-06 | |
| Society of St Hugh of Cluny Inc | Religion-related | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Soderstrom Scholars Fund Inc | Education | 501(c)(3) | 2023 | $0 | $59,285 | 2025-12 |
| Sonja Foundation Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $123,018 | 2025-12 | |
| Sophia Foundation for Dipg | Diseases, disorders and medical disciplines | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Spanish United Pentacostal Church | Religion-related | 501(c)(3) | 2017 | |||
| Squash Out Skin Cancer Inc | Medical research | 501(c)(3) | 2026 | |||
| St Barnabas Episcopal Church | 501(c)(3) | 1944 |
By cause in Greenwich, CT
- Philanthropy, voluntarism and grantmaking foundations 132
- Education 50
- Arts, culture and humanities 47
- Human services 22
- Recreation and sports 22
- Health care 19
- Community improvement and capacity building 16
- Religion-related 16
- Environment 12
- International, foreign affairs and national security 10
- Youth development 9
- Diseases, disorders and medical disciplines 7
- Public and societal benefit 7
- Housing and shelter 6
- Animal-related 6
- Employment 6
- Public safety, disaster preparedness and relief 5
- Medical research 5
- Mental health and crisis intervention 4
- Civil rights, social action and advocacy 4
- Science and technology 3
Nonprofits in every city of the state
Read from the IRS Exempt Organizations Business Master File, updated by the IRS on October 24, 2026 and rebuilt here every morning. Revenue and assets are from each organization's latest filing as the IRS lists it; the IRS record is the official one. Organizations only: no people are named on these pages.