Data / Nonprofits / California / San Mateo
Nonprofits in San Mateo, CA: 614 registered with the IRS
614 nonprofits are registered with the IRS in San Mateo, CA, 509 of them 501(c)(3) charities; the 225 that report revenue took in $456 million. The largest by revenue: Caminar ($49.3 million), Samaritan House ($35.6 million), Peninsula Family Service ($26 million). Most common causes: human services (76), education (59), philanthropy, voluntarism and grantmaking foundations (42).
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The 500 largest by revenue
| Organization | Category | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Caminar | Mental health and crisis intervention | 501(c)(3) | 1968 | $49.3 million | $47.4 million | 2025-06 |
| Samaritan House | 501(c)(3) | 1975 | $35.6 million | $38.1 million | 2025-06 | |
| Peninsula Family Service | Human services | 501(c)(3) | 1950 | $26 million | $15.3 million | 2025-06 |
| Bay Area Senior Services Inc | Housing and shelter | 501(c)(3) | 1993 | $22.3 million | $59.2 million | 2025-09 |
| Friends of 40 Baywood Avenue | Arts, culture and humanities | 501(c)(3) | 2025 | $21.8 million | $21.4 million | 2024-12 |
| Peninsula Golf & Country Club | 501(c)(7) | 1950 | $21 million | $35.1 million | 2024-12 | |
| St Johns Volunteers | 501(c)(3) | 1978 | $17.2 million | $14.8 million | 2025-12 | |
| The Carey School | 501(c)(3) | 1990 | $16.6 million | $40.1 million | 2025-06 | |
| San Mateo County Expostion and Fair Association | Recreation and sports | 501(c)(3) | 1948 | $15 million | $19.8 million | 2024-12 |
| Mission Hospice & Home Care Inc | Human services | 501(c)(3) | 1979 | $14.4 million | $10.1 million | 2025-06 |
| Family Housing and Adult Resources Inc | Human services | 501(c)(3) | 1970 | $11.6 million | $19.4 million | 2024-12 |
| Cora Community Overcoming Relationship Abuse | 501(c)(3) | 1978 | $9.3 million | $11 million | 2025-06 | |
| International Brotherhood of Electrical Workers | 501(c)(5) | 1940 | $9.2 million | $38.8 million | 2025-06 | |
| Next Level Sports Foundation Inc | Recreation and sports | 501(c)(3) | 2014 | $8.5 million | $101,762 | 2024-12 |
| Peking University Education Foundation USA | International, foreign affairs and national security | 501(c)(3) | 2000 | $8.3 million | $72.6 million | 2024-12 |
| Sonrisas Dental Health Inc | Health care | 501(c)(3) | 2001 | $7.2 million | $4.8 million | 2025-06 |
| Newton Center | Human services | 501(c)(3) | 2002 | $6.6 million | $2.1 million | 2024-12 |
| Peninsula Bridge Program | 501(c)(3) | 1995 | $6.5 million | $8.5 million | 2025-06 | |
| Stanbridge Academy | 501(c)(3) | 1975 | $6.1 million | $8.8 million | 2025-06 | |
| San Mateo County Community Colleges Foundation | Education | 501(c)(3) | 1967 | $5.8 million | $41.7 million | 2025-06 |
| Housing Endowment & Trust of San Mateo County | Religion-related | 501(c)(3) | 2008 | $5.8 million | $29.3 million | 2025-06 |
| Curiodyssey | Arts, culture and humanities | 501(c)(3) | 1955 | $5.3 million | $13.5 million | 2025-09 |
| Hip Housing Development Corporation | Housing and shelter | 501(c)(3) | 1992 | $5.1 million | $14.5 million | 2025-06 |
| Human Investment Project Inc | Housing and shelter | 501(c)(3) | 1972 | $4.9 million | $18.6 million | 2025-06 |
| Avalon Academy | Education | 501(c)(3) | 2005 | $4.6 million | $12.3 million | 2025-06 |
| Ferrari Club of America Inc | 501(c)(7) | 1976 | $4.6 million | $2.8 million | 2025-12 | |
| Waikoloa Mauka Land Corp | 501(c)(2) | 2016 | $3.7 million | $24.7 million | 2025-12 | |
| Society of St Vincent de Paul Particular Council of San Mateo | Human services | 501(c)(3) | 2009 | $3.5 million | $572,589 | 2025-09 |
| Society of St Vincent de Paul Particular Council of San Mateo | Human services | 501(c)(3) | 2009 | $3.3 million | $14.4 million | 2025-09 |
| Field Middle School | Education | 501(c)(3) | 2021 | $2.7 million | $2 million | 2025-06 |
| Odyssey School | Education | 501(c)(3) | 1998 | $2.5 million | $7.4 million | 2025-06 |
| San Mateo County Health Foundation | 501(c)(3) | 1994 | $2.5 million | $7.9 million | 2025-06 | |
| Empowerment Through Action | Education | 501(c)(3) | 2024 | $2.4 million | $2.3 million | 2025-06 |
| Chai Preschool Inc | Education | 501(c)(3) | 2007 | $2.4 million | $688,596 | 2025-06 |
| Canyon Springs Marketplace North Corp | Community improvement and capacity building | 501(c)(25) | 2007 | $2.3 million | $45 million | 2025-12 |
| Inplay Learning Network | Education | 501(c)(3) | 2024 | $2.2 million | $1.3 million | 2025-06 |
| San Mateo County Association of Realtors Inc | Community improvement and capacity building | 501(c)(6) | 2000 | $2 million | $4.3 million | 2024-12 |
| Center for Independence of Individuals With Disabitilites Inc | Human services | 501(c)(3) | 1979 | $2 million | $1.1 million | 2025-09 |
| Cake4kids | Youth development | 501(c)(3) | 2011 | $2 million | $315,909 | 2025-12 |
| Burkard School | Education | 501(c)(3) | 2017 | $2 million | $1.2 million | 2025-06 |
| International Brotherhood of Electrical Workers Building Inc | 501(c)(2) | 1956 | $1.8 million | $8.3 million | 2025-06 | |
| Housing Leadership Council of San Mateo County | Housing and shelter | 501(c)(3) | 2003 | $1.8 million | $1.8 million | 2025-12 |
| The Gathering | Arts, culture and humanities | 501(c)(3) | 1998 | $1.8 million | $1.8 million | 2024-12 |
| The Olympic Club Foundation | Religion-related | 501(c)(3) | 1992 | $1.8 million | $6.8 million | 2024-12 |
| Canyon Springs Marketplace Corp | 501(c)(25) | 1993 | $1.7 million | $144.2 million | 2025-12 | |
| Menlo Park Legends Baseball | 501(c)(3) | 2013 | $1.7 million | $116,259 | 2024-12 | |
| St Johns Cemetry Graves Association | 501(c)(13) | 1953 | $1.6 million | $11.7 million | 2025-12 | |
| Up Academy Inc | Education | 501(c)(3) | 2015 | $1.5 million | $234,800 | 2025-12 |
| Peninsula Conflict Resolution Center | Crime and legal-related | 501(c)(3) | 1992 | $1.4 million | $936,859 | 2025-06 |
| San Mateo County Colleges Educational Housing Corporation | Housing and shelter | 501(c)(3) | 2006 | $1.4 million | $184,006 | 2025-06 |
| City of San Mateo Retiree Funded Hra Trust | Mutual and membership benefit | 501(c)(9) | 2017 | $1.4 million | $16.7 million | 2024-12 |
| Hip Housing Affordable Ventures Inc Hhav | Housing and shelter | 501(c)(3) | 1998 | $1.4 million | $2.3 million | 2025-06 |
| Day School Foundation | Education | 501(c)(3) | 1996 | $1.3 million | $5.7 million | 2025-06 |
| Benevolent & Protective Order of Elks of the USA | 501(c)(8) | 1970 | $1.2 million | $3.2 million | 2026-03 | |
| 6510 General Drive Corporation | 501(c)(25) | 2001 | $1.2 million | $31.4 million | 2025-12 | |
| Parkridge Avenue 517 Corp | Community improvement and capacity building | 501(c)(2) | 2015 | $1.2 million | $15.7 million | 2025-12 |
| Leon A & Esther F Blum Foundation Inc | 501(c)(3) | 1982 | $1.2 million | $12.9 million | 2025-06 | |
| Peninsula Automotive Machinist Local 1414 | 501(c)(5) | 1940 | $1.1 million | $2.8 million | 2024-12 | |
| Hillsdale High School Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2009 | $1.1 million | $984,599 | 2025-06 |
| American Federation of Teachers | 501(c)(5) | 1967 | $1.1 million | $2.2 million | 2025-06 | |
| Bizworld Foundation | Education | 501(c)(3) | 1998 | $990,826 | $886,261 | 2025-08 |
| Bay Area Cancer Connections | Diseases, disorders and medical disciplines | 501(c)(3) | 1996 | $973,929 | $6 million | 2025-06 |
| American Federation of Labor & Congress of Industrial Orgs | 501(c)(5) | 1956 | $969,849 | $1.3 million | 2024-12 | |
| Christian Counseling Centers Inc | Human services | 501(c)(3) | 1984 | $962,032 | $1 million | 2025-12 |
| Peninsula Ballet Theatre | Arts, culture and humanities | 501(c)(3) | 1967 | $895,702 | $343,189 | 2025-06 |
| San Mateo County Economic Development Association Incorporat | 501(c)(4) | 1955 | $891,486 | $592,597 | 2026-06 | |
| San Mateo Consolidated Fire Department Funded Hra Trust | Mutual and membership benefit | 501(c)(9) | 2021 | $882,232 | $4.1 million | 2024-12 |
| Naturalena Foundation | Health care | 501(c)(3) | 2023 | $867,539 | $199,959 | 2024-12 |
| Peninsula Girls Fastpitch Association | Recreation and sports | 501(c)(3) | 2023 | $835,598 | $96,032 | 2025-12 |
| Ocean Ranch Boulevard 3605 Corp | Community improvement and capacity building | 501(c)(25) | 2015 | $813,761 | $23.3 million | 2025-12 |
| Foundation for San Mateo County Libraries | Community improvement and capacity building | 501(c)(3) | 2019 | $799,222 | $1.3 million | 2025-06 |
| Porsche Club of America | 501(c)(7) | 1977 | $789,411 | $228,724 | 2025-12 | |
| Woodlawn Foundation | Public and societal benefit | 501(c)(4) | 2008 | $764,165 | $59.5 million | 2025-12 |
| Pharmaceutical & Bioscience Society International | 501(c)(3) | 2010 | $758,106 | $729,154 | 2025-08 | |
| Blue Banner Volleyball | Recreation and sports | 501(c)(3) | 2023 | $754,714 | $142,262 | 2025-12 |
| California Clubhouse | Mental health and crisis intervention | 501(c)(3) | 2013 | $753,015 | $387,428 | 2025-06 |
| Indian Schools Alumni and Friends Insaf | 501(c)(3) | 1974 | $748,505 | $387,519 | 2025-12 | |
| Addiction Education Society Inc | Mental health and crisis intervention | 501(c)(3) | 2014 | $729,464 | $883,245 | 2025-06 |
| San Mateo County Parks and Recreation Foundation | Recreation and sports | 501(c)(3) | 1999 | $711,421 | $571,702 | 2025-06 |
| San Mateo Police Activities League | Youth development | 501(c)(3) | 1998 | $711,181 | $1.8 million | 2025-06 |
| Asiya Shriners | 501(c)(10) | 1940 | $710,204 | $6 million | 2024-12 | |
| Coyote Point Yacht Club | Recreation and sports | 501(c)(7) | 2017 | $702,689 | $308,759 | 2025-12 |
| 282 Harbor Drive Corp | Community improvement and capacity building | 501(c)(2) | 2013 | $693,472 | $6.7 million | 2025-12 |
| Nus America Inc | Education | 501(c)(3) | 2002 | $690,844 | $659,838 | 2025-03 |
| Homework Central | Education | 501(c)(3) | 2001 | $676,866 | $359,036 | 2025-06 |
| California Society of Facial Plastic Surgery Inc | Community improvement and capacity building | 501(c)(6) | 2001 | $580,808 | $289,584 | 2024-12 |
| Lebnet | Education | 501(c)(3) | 2011 | $579,022 | $658,509 | 2025-12 |
| Mpact Foundation | Human services | 501(c)(3) | 2024 | $564,671 | $748,577 | 2025-12 |
| Aragon High School Ptso Inc A California NPFT Public BNFT Corp | Education | 501(c)(3) | 2008 | $548,044 | $665,000 | 2025-06 |
| De Colores Arts | Arts, culture and humanities | 501(c)(3) | 2014 | $526,226 | $24,431 | 2025-12 |
| Larkspur Landing 100 Corp | Mutual and membership benefit | 501(c)(2) | 2014 | $500,807 | $3.3 million | 2025-12 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1943 | $470,803 | $720,045 | 2025-06 | |
| San Mateo Parents Nursery School Inc | 501(c)(3) | 1956 | $465,799 | $985,936 | 2025-06 | |
| Bay Area Charter School Athletic Conference | Education | 501(c)(3) | 2010 | $444,251 | $213,740 | 2025-06 |
| San Mateo Rotary Foundation | Community improvement and capacity building | 501(c)(3) | 1971 | $434,202 | $2 million | 2025-06 |
| Norma Gist Peoples Free Child Development Program Inc | Human services | 501(c)(3) | 1973 | $424,900 | $0 | 2024-12 |
| Northern California State Softball Assoc Inc | 501(c)(4) | 1980 | $419,003 | $305,946 | 2025-12 | |
| Sustainable San Mateo County | Environment | 501(c)(3) | 2002 | $412,049 | $287,688 | 2025-12 |
| Friends of the Mandarin Scholars in the SMFCSD | Education | 501(c)(3) | 2012 | $410,373 | $3.4 million | 2025-06 |
| San Mateo Chamber of Commerce | 501(c)(6) | 1977 | $408,858 | $226,152 | 2024-12 | |
| West Coast Federals Baseball Club | Recreation and sports | 501(c)(3) | 2014 | $406,257 | $175,629 | 2025-06 |
| Downtown San Mateo Association | 501(c)(6) | 1967 | $406,174 | $377,634 | 2025-06 | |
| San Mateo County Union Community Alliance | Human services | 501(c)(3) | 2004 | $405,250 | $528,644 | 2025-06 |
| The Mystical Humanity of Christ | Religion-related | 501(c)(3) | 2021 | $403,051 | $487,247 | 2024-12 |
| Franklin Street 1714 Corp | Community improvement and capacity building | 501(c)(2) | 2025 | $400,628 | $5.4 million | 2025-12 |
| Basil Technologies | 501(c)(3) | 2022 | $397,098 | $476,228 | 2025-12 | |
| Heart-Sv | Community improvement and capacity building | 501(c)(3) | 2025 | $393,453 | $3.6 million | 2025-06 |
| San Mateo Youth Softball Association | Recreation and sports | 501(c)(3) | 1995 | $386,253 | $156,627 | 2025-09 |
| Linear Park Inc | Recreation and sports | 501(c)(4) | 2003 | $385,046 | $321,213 | 2025-12 |
| Executive Ridge 3210 Corp | Community improvement and capacity building | 501(c)(2) | 2016 | $375,341 | $16.2 million | 2025-12 |
| San Mateo Public Library Foundation | 501(c)(3) | 1994 | $371,553 | $1.7 million | 2025-06 | |
| North Peninsula Mandarin School | 501(c)(3) | 1979 | $361,021 | $1.2 million | 2025-06 | |
| Iglesia Mision Pentecostes Cristo Viene | Religion-related | 501(c)(3) | 2016 | $350,176 | $608,431 | 2024-12 |
| San Mateo High School Foundation | Education | 501(c)(3) | 2003 | $324,735 | $351,942 | 2025-06 |
| Little Wonders A Parent-Child Center | Education | 501(c)(3) | 1995 | $310,290 | $679,922 | 2025-05 |
| California Teachers Association | 501(c)(5) | 1976 | $291,245 | $792,052 | 2025-08 | |
| Assistance League of San Mateo County | Human services | 501(c)(3) | 1954 | $287,266 | $717,942 | 2025-06 |
| San Mateo Police Officers Association | Community improvement and capacity building | 501(c)(5) | 2009 | $285,738 | $442,873 | 2024-12 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1943 | $280,640 | $368,264 | 2025-06 | |
| Utility Workers Union of America Afl-Cio | 501(c)(5) | 1944 | $272,437 | $508,592 | 2025-12 | |
| Taulama for Tongans | Health care | 501(c)(3) | 2002 | $267,690 | $60,012 | 2023-12 |
| Ibew Local 617 Benevolent Fund | Human services | 501(c)(3) | 2019 | $266,825 | $231,131 | 2024-12 |
| 130 North Brand Boulevard Inc | 501(c)(25) | 1997 | $264,296 | $10.3 million | 2025-12 | |
| International Association of Lions Clubs | Recreation and sports | 501(c)(4) | 1940 | $263,252 | $146,492 | 2025-06 |
| Norcal Cge Baseball Corp | Recreation and sports | 501(c)(3) | 2023 | $254,359 | $244,841 | 2024-12 |
| St James Community Development Corporation | Community improvement and capacity building | 501(c)(3) | 2023 | $245,392 | $301,970 | 2024-12 |
| Little League Baseball Inc | 501(c)(3) | 1967 | $242,422 | $325,647 | 2025-09 | |
| Ibew Local 617 Scholarship Fund | Education | 501(c)(3) | 2019 | $239,908 | $253,960 | 2024-12 |
| Bunker Hill Parents Participation Nursery School | 501(c)(3) | 1964 | $233,060 | $83,854 | 2025-06 | |
| Unitedly | Human services | 501(c)(3) | 2022 | $232,317 | $238,284 | 2024-12 |
| Autism Society of America | 501(c)(3) | 1992 | $229,867 | $212,146 | 2024-12 | |
| Orchid Conservation Alliance | Environment | 501(c)(3) | 2006 | $229,360 | $353,142 | 2025-12 |
| Bridging Tech Charitable Fund | Human services | 501(c)(3) | 2020 | $227,625 | $78,115 | 2024-12 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $225,748 | $172,934 | 2025-06 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $221,970 | $378,835 | 2025-06 | |
| California Teachers Associatin | 501(c)(5) | 1976 | $208,713 | $495,932 | 2025-08 | |
| American Federation of Teachers | 501(c)(5) | 1973 | $198,756 | $119,356 | 2024-06 | |
| Register Her | Civil rights, social action and advocacy | 501(c)(3) | 2022 | $198,285 | $34,187 | 2025-12 |
| San Mateo High School Athletic Boosters | Recreation and sports | 501(c)(3) | 2014 | $196,755 | $194,164 | 2025-06 |
| Townsend Street 130 Corp | Community improvement and capacity building | 501(c)(2) | 2025 | $196,461 | $17.4 million | 2025-12 |
| Silicon Valley Showcase Foundation Corporation | Recreation and sports | 501(c)(3) | 2024 | $190,754 | $5,873 | 2024-12 |
| Western Institute of Legal Medicine | Education | 501(c)(3) | 2013 | $188,875 | $55,936 | 2025-12 |
| San Mateo Fire Department Widows and Orphans Mutual Aid Fund | 501(c)(5) | 2004 | $188,644 | $2.5 million | 2025-12 | |
| Village Hope Partnership Inc | Human services | 501(c)(3) | 2015 | $184,929 | $30,387 | 2025-06 |
| San Mateo Dog Training Club Inc | Animal-related | 501(c)(4) | 2000 | $181,657 | $132,812 | 2025-12 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $181,542 | $155,454 | 2025-06 | |
| San Mateo Nippon Gakuyen | Arts, culture and humanities | 501(c)(3) | 1964 | $179,588 | $358,820 | 2024-12 |
| Achieve Employee Care Fund Inc | Human services | 501(c)(3) | 2021 | $174,489 | $261,774 | 2024-12 |
| Rotary Haciendas Inc | Housing and shelter | 501(c)(3) | 1986 | $171,397 | $13.6 million | 2025-06 |
| 650 Xtreme Volleyball Club | Youth development | 501(c)(3) | 2011 | $166,629 | $13,161 | 2024-12 |
| Tahdah Foundation | Youth development | 501(c)(3) | 2016 | $158,986 | $142,310 | 2025-06 |
| Royal Order of Jesters | 501(c)(10) | 1972 | $158,270 | $659,497 | 2025-12 | |
| Zawaya | Arts, culture and humanities | 501(c)(3) | 2003 | $154,776 | $333,663 | 2024-12 |
| San Mateo High School Music Boosters | 501(c)(3) | 1980 | $147,801 | $218,941 | 2025-06 | |
| Aragon High School Athletic Boosters | Recreation and sports | 501(c)(3) | 2014 | $142,793 | $74,753 | 2025-06 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1943 | $140,190 | $183,384 | 2025-06 | |
| Little League Baseball Inc | 501(c)(3) | 1967 | $139,224 | $58,328 | 2025-09 | |
| San Mateo County Fellowship Inc | 501(c)(3) | 1986 | $131,013 | $133,108 | 2025-12 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $129,515 | $252,633 | 2025-06 | |
| Endue Foundation | Human services | 501(c)(3) | 2003 | $124,788 | $1.3 million | 2025-12 |
| San Mateo County Labor Publishing Company | 501(c)(5) | 1983 | $123,665 | $12,191 | 2024-12 | |
| San Mateo Arboretum Society Inc | Environment | 501(c)(3) | 1976 | $117,763 | $265,572 | 2025-06 |
| One Hundred Club of San Mateo County Edwin Johnson | 501(c)(3) | 1973 | $111,969 | $809,574 | 2025-10 | |
| Feelosophers Path | Education | 501(c)(3) | 2014 | $110,012 | $66,944 | 2025-12 |
| Foster City Little League Incorporated | 501(c)(3) | 1967 | $106,947 | $89,937 | 2025-09 | |
| San Mateo Consolidated Fire Department Firefighters Associatio | Employment | 501(c)(5) | 2020 | $106,425 | $71,488 | 2025-12 |
| Chinese Christian Church Music Institute | Arts, culture and humanities | 501(c)(3) | 2000 | $104,020 | $41,147 | 2024-12 |
| San Mateo County Chapter of the American Institute of Architects | 501(c)(6) | 1988 | $103,970 | $92,003 | 2025-12 | |
| Prevent Cruelty To Animals | Animal-related | 501(c)(3) | 2009 | $101,361 | $354,749 | 2025-12 |
| Team Max Together Against Alexander Disease | Medical research | 501(c)(3) | 2024 | $90,184 | $116,012 | 2025-12 |
| California State Division Intrnatl Association for Identification | 501(c)(6) | 1965 | $88,821 | $279,697 | 2026-04 | |
| Peninsula Social Club Foundation | Education | 501(c)(3) | 2002 | $85,809 | $135,282 | 2025-12 |
| New Time Church Inc | Religion-related | 501(c)(3) | 2025 | $81,254 | $40,721 | 2025-12 |
| Economic Vitality Education and Rsearch Foundation | 501(c)(3) | 1977 | $80,693 | $106,577 | 2026-06 | |
| Peninsula Bay Volleyball Officials | Recreation and sports | 501(c)(3) | 2022 | $80,250 | $17,617 | 2025-12 |
| Aragon High School Music Boosters | Education | 501(c)(3) | 2001 | $78,583 | $7,169 | 2025-06 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $78,348 | $43,692 | 2025-06 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1943 | $77,479 | $75,129 | 2025-06 | |
| San Mateo Garden Center | Environment | 501(c)(3) | 1972 | $75,376 | $170,104 | 2024-12 |
| Nisei Ski Club | 501(c)(7) | 1969 | $75,061 | $55,390 | 2026-05 | |
| National League of Young Men Inc | 501(c)(3) | 2010 | $70,192 | $111,596 | 2026-06 | |
| Coastside Fishing Club | Recreation and sports | 501(c)(7) | 2003 | $67,430 | $316,197 | 2025-12 |
| Delta San Francisco-Peninsula Foundation | Education | 501(c)(3) | 1999 | $66,926 | $910,890 | 2024-12 |
| Rotary Internaional | 501(c)(4) | 1942 | $65,666 | $30,492 | 2025-06 | |
| Looking Glass Korean School | Education | 501(c)(3) | 2015 | $60,771 | $74,321 | 2025-06 |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $54,788 | $128,345 | 2025-06 | |
| San Mateo Masonic Temple Inc | 501(c)(2) | 1964 | $54,660 | $37,071 | 2025-12 | |
| Consumer Federation of California Education Foundation | Public and societal benefit | 501(c)(3) | 2001 | $52,685 | $366,954 | 2025-12 |
| Via Vetera | Religion-related | 501(c)(3) | 2019 | $51,590 | $10,324 | 2025-12 |
| Palisades of San Mateo Owners Association | Human services | 501(c)(4) | 2020 | $51,353 | $191,234 | 2025-12 |
| Cidr Foundation | Science and technology | 501(c)(3) | 2020 | $50,944 | $213,360 | 2024-12 |
| San Bruno Dog Obedience School Inc | 501(c)(7) | 1994 | $48,692 | $17,109 | 2025-12 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $47,071 | $58,633 | 2026-06 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $46,123 | $84,074 | 2025-06 | |
| Rotary International | 501(c)(4) | 1958 | $45,318 | $16,010 | 2025-06 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1943 | $45,111 | $66,030 | 2025-06 | |
| Parent Booster USA Inc | Education | 501(c)(3) | 2005 | $42,514 | $31,479 | 2025-06 |
| The Evergreen Education Foundation | Education | 501(c)(3) | 2001 | $38,701 | $1.8 million | 2024-12 |
| California Teachers Association | 501(c)(5) | 1976 | $37,787 | $29,585 | 2025-08 | |
| San Mateo High School Drama | 501(c)(3) | 1992 | $37,324 | $90,955 | 2025-06 | |
| San Mateo City Parks and Recreation Foundation | Recreation and sports | 501(c)(3) | 2012 | $37,209 | $292,125 | 2025-12 |
| San Mateo County Realtors Foundation | 501(c)(3) | 1992 | $37,084 | $14,467 | 2024-12 | |
| Aragon High School Drama Boosters | Education | 501(c)(3) | 2011 | $36,930 | $96,769 | 2025-07 |
| FCTC Inc | Recreation and sports | 501(c)(7) | 2024 | $32,990 | $36,406 | 2025-12 |
| Italian-American Womens Guild | 501(c)(7) | 1998 | $31,526 | $77,717 | 2024-12 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $30,643 | $65,191 | 2025-06 | |
| Tzu Hsiang Tao Yuan | Religion-related | 501(c)(3) | 2007 | $20,740 | $427,724 | 2025-12 |
| Persian American Society | 501(c)(3) | 1993 | $19,125 | $22,629 | 2025-12 | |
| San Mateo Sister City Association Inc | International, foreign affairs and national security | 501(c)(3) | 2023 | $15,010 | $75,364 | 2024-12 |
| San Francisco Sheriffs Air Squadron | 501(c)(3) | 1975 | $14,298 | $14,083 | 2025-12 | |
| Theology Academy | Education | 501(c)(3) | 2023 | $11,869 | $2,879 | 2024-12 |
| Gate Parents Group of the San Mateo Union High School District | Education | 501(c)(3) | 1996 | $9,428 | $270,044 | 2025-07 |
| Dreams in Action International | Education | 501(c)(3) | 2004 | $7,383 | $5,752 | 2025-05 |
| Birds of Life Foundation | Human services | 501(c)(3) | 2018 | $3,831 | $397 | 2023-12 |
| San Francisco Peninsula Organ Academy | Arts, culture and humanities | 501(c)(3) | 2014 | $3,143 | $42,724 | 2025-12 |
| Microsurgical Transplantation Research Foundation | Medical research | 501(c)(3) | 1965 | $3,009 | $268,269 | 2025-12 |
| Coastside Fishing Foundation | Animal-related | 501(c)(3) | 2015 | $2,850 | $52,838 | 2025-12 |
| The Spring Inc | Religion-related | 501(c)(3) | 2002 | $2,100 | $100 | 2025-04 |
| Tracy Capital Park Corp | 501(c)(2) | 2016 | $1,765 | $8.7 million | 2024-12 | |
| Bioneomed Research Foundation | Medical research | 501(c)(3) | 2019 | $527 | $2,227 | 2025-12 |
| Bairex Corp | Education | 501(c)(3) | 2023 | $2 | $19,703 | 2025-12 |
| 4022 Chino Hills Pkwy Inc | Mutual and membership benefit | 501(c)(2) | 2013 | $0 | $0 | 2025-12 |
| 7400 Stewart & Gray Inc | Community improvement and capacity building | 501(c)(2) | 2013 | $0 | $0 | 2025-12 |
| Abbott Middle School Drama Boosters Inc | Arts, culture and humanities | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Ac Water Polo Inc | Recreation and sports | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Agi and Asi Research Foundation | Education | 501(c)(3) | 2025 | |||
| Align Scoliosis Foundation | Diseases, disorders and medical disciplines | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Amasdar Foundation | Public and societal benefit | 501(c)(3) | 2025 | $0 | $0 | 2025-10 |
| Ambassador S Light Network Inc | Mental health and crisis intervention | 501(c)(3) | 2024 | $0 | $0 | 2023-12 |
| American Asians Collaborating and Empowering | Civil rights, social action and advocacy | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| American Association of University Women | Education | 501(c)(4) | 2010 | $0 | $0 | 2025-06 |
| American Association of University Women | Education | 501(c)(4) | 2010 | $0 | $0 | 2025-06 |
| American Legion Auxiliary | 501(c)(19) | 1946 | $0 | $0 | 2025-09 | |
| American Orff-Schulwerk Association | 501(c)(3) | 1976 | $0 | $0 | 2026-06 | |
| American Postal Workers Union | 501(c)(5) | 1973 | $0 | $0 | 2025-12 | |
| Angel of Ours Inc | Human services | 501(c)(3) | 2025 | |||
| Animal Run | Animal-related | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Art of Healing | Mental health and crisis intervention | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Asian American Curriculum Project Inc | International, foreign affairs and national security | 501(c)(3) | 1970 | $0 | $0 | 2024-12 |
| Association for Women in Science Inc | 501(c)(3) | 1990 | $0 | $0 | 2023-06 | |
| Association for Women in Science Inc | 501(c)(3) | 1990 | $0 | $0 | 2026-06 | |
| Association for Women in Science Inc | 501(c)(3) | 1990 | $0 | $0 | 2025-06 | |
| Association for Women in Science Inc | Science and technology | 501(c)(3) | 1990 | $0 | $0 | 2026-06 |
| Baszucki Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $39.5 million | 2024-12 | |
| Baywood Neighborhood Association | 501(c)(4) | 1990 | $0 | $0 | 2025-12 | |
| Beilin-Makagon Art Foundation | Arts, culture and humanities | 501(c)(3) | 2021 | $26.7 million | 2024-12 | |
| Benevolent & Protective Order of Elks of the USA 1112 Building Inc | 501(c)(8) | 1951 | $0 | $1.6 million | 2026-03 | |
| Beresford-Hillsdale Homeowners Association | 501(c)(4) | 1991 | $0 | $0 | 2025-09 | |
| Beyond Bars Coaching | Human services | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Blockchain By Women | Science and technology | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Blume Foundation | 501(c)(3) | 1959 | $17.2 million | 2024-11 | ||
| Bohannon Foundation | 501(c)(3) | 1952 | $2.5 million | 2024-11 | ||
| Brazilian Women Collective Inc | Human services | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Broadcast Legends | Recreation and sports | 501(c)(7) | 2001 | $0 | $0 | 2025-12 |
| Butimar Productions | Arts, culture and humanities | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| California Optometric Association | 501(c)(6) | 1966 | $0 | $0 | 2025-12 | |
| California State Friendship Committee | International, foreign affairs and national security | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Casa de Dios Puerta Del Cielo | 501(c)(3) | 1972 | ||||
| Casting A Rise Foundation | Recreation and sports | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Centennial Montessori Children S Fund Inc | Youth development | 501(c)(3) | 2021 | $0 | $406,167 | 2025-12 |
| Center for Balanced Land Use Inc | Environment | 501(c)(3) | 2010 | $0 | $0 | 2024-12 |
| Central Neighborhood Assc | Community improvement and capacity building | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Centro Cristiano Internacional Kingsway Inc | 501(c)(3) | 1970 | ||||
| Chabad NP | Religion-related | 501(c)(3) | 2010 | |||
| Chance To Excel | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $649,831 | 2024-12 | |
| Chemical Dependency Center Alumni Association | Mental health and crisis intervention | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Cherry Blossom Alumnae Association | Arts, culture and humanities | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| China Times Cultural Foundation | 501(c)(3) | 1986 | $4.4 million | 2025-12 | ||
| Christian Family Fellowship | 501(c)(3) | 1986 | ||||
| Christians of the Evangelical Faith Pentecostal | 501(c)(3) | 1971 | ||||
| Church of God and Saints of Christ | 501(c)(3) | 1973 | ||||
| Church of the Living God Christian Workers for Fellowship | 501(c)(3) | 1965 | ||||
| Church of the Living God Christian Workers for Fellowship | 501(c)(3) | 1965 | ||||
| Claremont Art Guild | Arts, culture and humanities | 501(c)(3) | 2014 | $0 | $0 | 2025-06 |
| Cleaning Cali Foundation Inc | Environment | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Clement Chen Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1995 | $222,526 | 2025-12 | |
| Code Blue and White | Arts, culture and humanities | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Coleman Research Group | Social science | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Community Baptist Church | 501(c)(3) | 1955 | ||||
| Concilio Iglesia Mision Evangelica Principe de Paz Pentecostes Intern | Religion-related | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Congregational Church of San Mateo | 501(c)(3) | 1965 | ||||
| Convoy for A Cause | 501(c)(3) | 2024 | ||||
| Coyote Point Rifle & Pistol Club Inc | Education | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Creative Fellowship Church | 501(c)(3) | 1979 | ||||
| Dave Stiles Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Deluna Ventures Inc | Diseases, disorders and medical disciplines | 501(c)(3) | 2025 | $0 | $4,611 | 2025-12 |
| Dennis and Gloria Obrien Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2003 | $845,699 | 2025-12 | |
| District 21 American Contract Bridge League | 501(c)(4) | 2010 | $0 | $0 | 2025-12 | |
| Draper Foundation | Education | 501(c)(3) | 1998 | $188.3 million | 2024-12 | |
| Drysdale Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2019 | $1.3 million | 2024-12 | |
| Elfenworks Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2007 | $5.4 million | 2025-12 | |
| Elks Bay District Per Association | Community improvement and capacity building | 501(c)(10) | 2018 | $0 | $0 | 2025-05 |
| Emsen House | Human services | 501(c)(3) | 2025 | $0 | $1 | 2025-12 |
| Eric Roberts Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2007 | $259,029 | 2025-12 | |
| Erik S Cassel Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2019 | $7 million | 2024-12 | |
| Ethics San Mateo | Community improvement and capacity building | 501(c)(4) | 2024 | $0 | $0 | 2025-12 |
| Everflow Sanctuary | Environment | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Faith Community Church of Peninsula | 501(c)(3) | 1965 | ||||
| Fard Foundation Trust Dated December 15 2023 | 501(c)(3) | 2024 | $184,500 | 2024-12 | ||
| Firebirds Youth Baseball Academy | Recreation and sports | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Firefighters Toys for Tots Inc | Human services | 501(c)(3) | 2004 | $0 | $0 | 2024-12 |
| First Presbyterian Church of San Mateo | 501(c)(3) | 1964 | 2015-12 | |||
| First Samoan Christian Church in San Mateo | 501(c)(3) | 1982 | ||||
| Five Spot Dance Club Inc | 501(c)(7) | 1986 | $0 | $0 | 2025-12 | |
| Flossin for Smiles Inc | Health care | 501(c)(3) | 2025 | |||
| Flourish Hope Project | Human services | 501(c)(3) | 2025 | |||
| Forest Rose Leaf Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2022 | $305,608 | 2025-12 | |
| Forge Literary Press | Arts, culture and humanities | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Foster City Flyers | Youth development | 501(c)(3) | 2001 | $0 | $0 | 2023-08 |
| Foundation for Latin American Scientists | Medical research | 501(c)(3) | 2024 | |||
| Foundation for the Smac Education and Leadership Programs | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Frank Livermore Trust | 501(c)(3) | 1985 | $1.6 million | 2026-06 | ||
| Franklin Templeton Charitable Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2000 | $1.8 million | 2025-09 | |
| Free & Accepted Masons of California | 501(c)(10) | 1940 | $0 | $0 | 2024-12 | |
| Freeschools World Literacy USA Inc | International, foreign affairs and national security | 501(c)(3) | 2009 | $0 | $0 | 2024-12 |
| Friends of Troop 42 San Mateo Inc | Youth development | 501(c)(3) | 2026 | |||
| Full Gospel Fellowship of Churches and Ministers Intl Inc | 501(c)(3) | 1964 | ||||
| Future Education Foundation | Education | 501(c)(3) | 2023 | $4,146 | 2023-12 | |
| G W Williams Foundation | 501(c)(3) | 1956 | $440,442 | 2025-11 | ||
| Gate International Ministry Center | 501(c)(3) | 1964 | ||||
| Gather and Give | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2026 | |||
| Get Dirty | Environment | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Ginn Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2006 | $19 million | 2024-12 | |
| Global Academy Alliance | Education | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Golden Gate Society of Enrolled Agents Inc | Employment | 501(c)(6) | 2014 | $0 | $0 | 2025-06 |
| Golden State Adaptive Sports | Recreation and sports | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Golden State Football Coaches Community Inc | Recreation and sports | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Goshen Foundation | Religion-related | 501(c)(3) | 2006 | $122,695 | 2024-12 | |
| Grace Gospel Christian Church Rca | Religion-related | 501(c)(3) | 2006 | |||
| Grace Lutheran Church | 501(c)(3) | 1941 | ||||
| Greater Life Ministries | 501(c)(3) | 1958 | ||||
| Greater San Mateo Kiwanis Club Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2005 | $0 | $0 | 2025-09 |
| Green Apple Foundation Inc | Environment | 501(c)(3) | 2020 | $713,079 | 2025-12 | |
| Green Thumb Foundation | Arts, culture and humanities | 501(c)(3) | 2012 | $0 | $17,068 | 2024-12 |
| Greene Van Arsdale Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1997 | $42.3 million | 2025-12 | |
| Hands That Help-Ministry Inc | Food, agriculture and nutrition | 501(c)(3) | 2025 | |||
| Head Start Auxiliary | 501(c)(3) | 1968 | $0 | $0 | 2026-06 | |
| Heart of Wisdom Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | $103,126 | 2024-12 | |
| Helen and Sanford Diller Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $812,090 | 2024-12 | |
| Hillcrest Chaplancy and Ministries of San Mateo | 501(c)(3) | 1974 | ||||
| Hillsdale High School Athletic Booster Club | Recreation and sports | 501(c)(3) | 2025 | $0 | $0 | 2025-07 |
| Hope Uniforms Program | Human services | 501(c)(3) | 2026 | |||
| Hotel Gildford Preservation & Scholarship Society Inc | Education | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Humanity Through Education | Civil rights, social action and advocacy | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Hungarian American Chamber of Commerce in the U S Inc | 501(c)(6) | 1992 | $0 | $0 | 2025-12 | |
| Hypopara Research Foundation | Health care | 501(c)(3) | 2019 | $0 | $53,365 | 2025-12 |
| Ice Preservation | Science and technology | 501(c)(3) | 2025 | |||
| Iep Collaborative Inc | Human services | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Iglesia Biblica Bautista Vida Nueva | Religion-related | 501(c)(3) | 2015 | |||
| Iglesia Cristiana Dios de Pactos Inc | Religion-related | 501(c)(3) | 2022 | |||
| Iglesia Internacional Principe de Paz Inc | Religion-related | 501(c)(3) | 2024 | |||
| Iglesia Mision Evangelica Principe de Paz Pentecostes | Religion-related | 501(c)(3) | 2022 | $0 | $0 | 2023-12 |
| Iglesia Mission Pentecostes Restaurando Vidas Para Cristo | Religion-related | 501(c)(3) | 2015 | |||
| Iglesia Pentecostal | 501(c)(3) | 1964 | ||||
| Iglesia de Restauracion El Dios Eterno | Religion-related | 501(c)(3) | 2024 | |||
| Immersive Fiction | Arts, culture and humanities | 501(c)(3) | 2026 | $1 | 2025-12 | |
| Impact Therapy | Mental health and crisis intervention | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Imup Recovery | Human services | 501(c)(3) | 2024 | $0 | $0 | 2023-12 |
| International Association of Lions Clubs | Community improvement and capacity building | 501(c)(4) | 1940 | $0 | $0 | 2025-06 |
| International Association of Lions Clubs | 501(c)(4) | 1940 | $0 | $0 | 2024-06 | |
| International Fire Service Foundation | Public safety, disaster preparedness and relief | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| International Foundation for Education and Relief | International, foreign affairs and national security | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Ipul San Francisco Inc | Religion-related | 501(c)(3) | 2026 | |||
| Islamic Society of San Mateo | Religion-related | 501(c)(3) | 2000 | |||
| It Takes A Village Children & Family Services Inc | Community improvement and capacity building | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| J H Robbins Foundation | 501(c)(3) | 1984 | $1 million | 2025-06 | ||
| Jacobs Impact Fund Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | |||
| Japanese American Citizens League San Mateo Chapter | 501(c)(3) | 1964 | $0 | $0 | 2025-12 | |
| Jewish Center of North Peninsula Inc | Religion-related | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Jewish Legal News Inc | Religion-related | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| John & Arlette Monfredini Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2016 | $1.3 million | 2025-12 | |
| June Watanabe in Company | Arts, culture and humanities | 501(c)(3) | 1981 | $0 | $0 | 2026-06 |
| Justin Parker Warrior House | Human services | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Kallen and Helen Chan Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $10,006 | 2025-12 | |
| Keizai Silicon Valley | Community improvement and capacity building | 501(c)(6) | 2011 | $0 | $0 | 2026-06 |
| Knowcash | Education | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Kusoma International | Education | 501(c)(3) | 2020 | $0 | $0 | 2025-09 |
| Kyros Ministry | 501(c)(3) | 1984 | ||||
| Latinos Unidos Encristo | 501(c)(3) | 1964 | ||||
| League of Women Voters of North & Central San Mateo County | Public and societal benefit | 501(c)(3) | 2016 | $0 | $0 | 2025-06 |
| Li & Liu Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $2.5 million | 2025-08 | |
| Lijin Gouhua Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2007 | $7.2 million | 2024-12 | |
| Living Word Chruch of the Deaf Incorporated | 501(c)(3) | 1984 | ||||
| Lost Cats | Animal-related | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Luna Grove Inc | Food, agriculture and nutrition | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Luso-American Financial A Fraternal Benefit Society | 501(c)(8) | 1958 | $0 | $0 | 2024-12 | |
| Lyda-Rico Deluca Foundation Inc | 501(c)(3) | 1971 | $520,810 | 2024-12 | ||
| MTG Health and Wellness Inc | Health care | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Makeknowledge | Education | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Making Pivotal Strides Inc | Human services | 501(c)(3) | 2021 | |||
| Manos Unidas Contigo Peru | International, foreign affairs and national security | 501(c)(3) | 2009 | $0 | $0 | 2023-12 |
| Maranatha Assembly of God of San Mateo | 501(c)(3) | 1987 | ||||
| Marie Kendrick Otto Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $621,284 | 2025-12 | |
| Masjid-Ul-Haqq | Religion-related | 501(c)(3) | 2024 | |||
| Mayoguatemala Foundation Co | International, foreign affairs and national security | 501(c)(3) | 2024 | $0 | $0 | 2026-01 |
| Medlend Org | Health care | 501(c)(3) | 2000 | $374,280 | 2025-06 | |
| Melodic Outreach Endeavor | Arts, culture and humanities | 501(c)(3) | 2024 | |||
| Message Church of the Assemblies of God | 501(c)(3) | 1964 | ||||
| Mid Peninsula Parish | 501(c)(3) | 1971 | ||||
| Mid-Peninsula Ice Rink Foundation 2021 | Recreation and sports | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Middleton Foundation | 501(c)(3) | 1990 | $14.1 million | 2024-12 | ||
| Minister the Independent Church of the Incarnation Inc | 501(c)(3) | 1971 | ||||
| Minority Television Project Inc | Arts, culture and humanities | 501(c)(3) | 2019 | $109.3 million | 2024-12 | |
| Mision Pentecostes Restaurando Vida Para Cristo | Human services | 501(c)(3) | 2014 | |||
| More Than Qualified | Employment | 501(c)(3) | 2014 | $0 | $4,385 | 2023-12 |
| Mosaic Vineyard Church | Religion-related | 501(c)(3) | 2014 | |||
| National Spiritual Assembly of the Bahais of the Us | 501(c)(3) | 1965 | ||||
| Nature Bloomers | Environment | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| New Age Awareness Foundation | 501(c)(3) | 1976 | ||||
| New Community Mission Church | Religion-related | 501(c)(3) | 2003 | |||
| New Courant | Education | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| New Life Mission Church of Silicon Valley | Religion-related | 501(c)(3) | 2003 | |||
| Newcomers Club of San Mateo County | Recreation and sports | 501(c)(7) | 2000 | $0 | $0 | 2026-04 |
| Night Out Night Off | Arts, culture and humanities | 501(c)(3) | 2021 | $0 | $0 | 2026-06 |
| Norcal Shomrim | Human services | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| North Central Neighborhood Association | Community improvement and capacity building | 501(c)(3) | 1996 | $0 | $0 | 2025-06 |
| Northern California Coalition of Genetic Counselors | Diseases, disorders and medical disciplines | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Northern California Community College Track and Cross Country Co | Education | 501(c)(3) | 2018 | |||
| Nuoc Solutions | Environment | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Omg Flyers | Recreation and sports | 501(c)(7) | 2026 | |||
| Ongley R Ocon Inc | Health care | 501(c)(3) | 2019 | $0 | $1 | 2023-12 |
| Organization of Chinese-Americans Inc | 501(c)(3) | 1975 | $0 | $0 | 2025-12 | |
| Our Neighborhood Voices - Education Corporation | Education | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Panamanian Society of Arts and Culture | Arts, culture and humanities | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Paul J Boschetto Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $87,518 | 2024-12 | |
| Pay It Foreward | Recreation and sports | 501(c)(3) | 2025 | |||
| Peace Action of San Mateo County | International, foreign affairs and national security | 501(c)(4) | 2013 | $0 | $0 | 2025-12 |
| Peninsula Ballet Arts | Arts, culture and humanities | 501(c)(3) | 2026 | |||
| Peninsula Chinese Alliance Church of the C&MA | 501(c)(3) | 1972 | ||||
| Peninsula Chinese Church Inc | Religion-related | 501(c)(3) | 2018 | |||
| Peninsula Chinese Family Foundation | Education | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Peninsula Dance Company | Arts, culture and humanities | 501(c)(3) | 2025 | |||
| Peninsula Multifaith Coalition Inc | Religion-related | 501(c)(3) | 2016 | $0 | $0 | 2026-06 |
| Peninsula Orchid Society Inc | Food, agriculture and nutrition | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Peninsula Soccer Referee Association | Recreation and sports | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Peninsula Temple Beth El | 501(c)(3) | 1968 | ||||
| Pharmaceutical & Bioscience Society International | 501(c)(3) | 2010 | $0 | $0 | 2025-08 | |
| Pharmaceutical & Bioscience Society International | Education | 501(c)(3) | 2010 | |||
| Piedemonte Charitable Trust 020497 | Human services | 501(c)(3) | 1999 | $1 | 2025-12 | |
| Pinnacle Foundation | Crime and legal-related | 501(c)(3) | 2025 | |||
| Porter Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $1,215 | 2025-07 | |
| Post Agi Education Foundation | Education | 501(c)(3) | 2026 | |||
| Potter Family Foundation | Education | 501(c)(3) | 2017 | $38,089 | 2026-06 | |
| Prophet Elijah Media | Religion-related | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Protestant Episcopal Church in the Diocese of California | 501(c)(3) | 1976 | ||||
| Protestant Episcopal Church in the Diocese of California | 501(c)(3) | 1976 | ||||
| Pta California Congress of Parents Teachers & Students | 501(c)(3) | 1967 | $0 | $0 | 2024-06 | |
| Pta California Congress of Parents Teachers & Students Inc | 501(c)(3) | 1967 | $0 | $0 | 2025-06 | |
| Public Data Library Inc | Public and societal benefit | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Raising Light Foundation Inc | Human services | 501(c)(3) | 2025 | $350,200 | 2025-12 | |
| Recovery Road Online Inc | Mental health and crisis intervention | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Redwood Future Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Refuge Community Church | Religion-related | 501(c)(3) | 2020 | |||
| Reinventmd Foundation | 501(c)(3) | 2026 | $0 | $0 | 2025-12 | |
| Responsible Development for Water Tank Hill | Environment | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Revival International Community | Religion-related | 501(c)(3) | 2014 | |||
| Robert I & Lien Q Chen Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $3.1 million | 2024-12 | |
| Roberts Foundation | 501(c)(3) | 1985 | $324.1 million | 2024-12 | ||
| Rupert H Johnson Jr Foundation | 501(c)(3) | 1993 | $2 million | 2025-12 | ||
| SJ3 16alfa Y Omega | Religion-related | 501(c)(3) | 2010 | |||
| SRCS | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Saint Gregory Church | 501(c)(3) | 1946 | ||||
| Saint Matthew Church | 501(c)(3) | 1946 | ||||
| San Francisco Accordion Club | Arts, culture and humanities | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| San Francisco Bay Area Reformed Evangelical Church | Religion-related | 501(c)(3) | 2001 | |||
| San Francisco Bay Area Water Users Association | 501(c)(4) | 1991 | $0 | $0 | 2024-06 | |
| San Francisco Tabernacle | 501(c)(3) | 1964 | ||||
| San Mateo Adult School Federation of Teachers Aft CFT Afl-Cio Local | Employment | 501(c)(5) | 2014 | $0 | $0 | 2026-06 |
| San Mateo Baptist Temple | 501(c)(3) | 1975 | ||||
| San Mateo Buddhist Church | 501(c)(3) | 1967 | ||||
| San Mateo Charities Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| San Mateo County Astronomical Society | 501(c)(3) | 1977 | $0 | $0 | 2025-12 | |
| San Mateo County Community College District Financing Corporation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(4) | 2005 | $0 | $0 | 2025-06 |
| San Mateo County Genealogical Society | 501(c)(3) | 1983 | $0 | $0 | 2025-12 | |
| San Mateo County Women Lawyers Section Educational Foundation | Civil rights, social action and advocacy | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| San Mateo Crta - Scholarship and Educational Foundation Inc | Education | 501(c)(3) | 2009 | $0 | $0 | 2023-06 |
| San Mateo Heritage Alliance Inc | Community improvement and capacity building | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| San Mateo Highlands Community Association | 501(c)(4) | 1986 | $0 | $0 | 2024-12 | |
| San Mateo Japanese-American Community Center | Human services | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| San Mateo Kendo Dojo | Recreation and sports | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| San Mateo Master Marlins Inc | 501(c)(3) | 1990 | $0 | $0 | 2025-12 | |
| San Mateo Medical Center Volunteers | 501(c)(3) | 1976 | $0 | $79,693 | 2025-12 | |
| San Mateo Parents Club | 501(c)(7) | 1994 | $0 | $0 | 2025-12 | |
| San Mateo Park Neighborhood Association | Community improvement and capacity building | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| San Mateo Police Department K-9 Unit Inc | Crime and legal-related | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| San Mateo Pony-Colt Baseball League | Recreation and sports | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| San Mateo Track Club | Recreation and sports | 501(c)(3) | 2020 | $0 | $0 | 2025-09 |
| Sankari Education Alliance Inc | Education | 501(c)(3) | 2025 | |||
| School Nurses Association of Santa Clara County | Health care | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Second Chance Project | Youth development | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Shaker S Charitable Foundation | Youth development | 501(c)(3) | 2020 | $0 | $0 | 2023-12 |
| Shao - Li Charitable Trust | Education | 501(c)(3) | 2022 | $4,174 | 2026-06 | |
| Shi and Xu Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | $22,168 | 2025-12 | |
| Sholom Fund | Religion-related | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Shriners International | 501(c)(10) | 1940 | $0 | $0 | 2025-12 | |
| Shriners International | 501(c)(10) | 1940 | $0 | $0 | 2025-12 | |
| Shriners International | 501(c)(10) | 1940 | $0 | $0 | 2025-12 | |
| Shriners International | 501(c)(10) | 1940 | ||||
| Shriners International | 501(c)(10) | 1940 | $0 | $0 | 2025-12 | |
| Shriners International | 501(c)(10) | 1940 | $0 | $0 | 2025-12 |
By cause in San Mateo, CA
- Human services 76
- Education 59
- Philanthropy, voluntarism and grantmaking foundations 42
- Religion-related 39
- Recreation and sports 36
- Arts, culture and humanities 33
- Community improvement and capacity building 28
- Environment 12
- Youth development 10
- Health care 10
- Mental health and crisis intervention 10
- International, foreign affairs and national security 9
- Housing and shelter 8
- Animal-related 6
- Public and societal benefit 5
- Diseases, disorders and medical disciplines 5
- Medical research 5
- Civil rights, social action and advocacy 4
- Science and technology 4
- Crime and legal-related 4
- Food, agriculture and nutrition 4
- Mutual and membership benefit 4
- Employment 4
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.