Data / Nonprofits / Connecticut / Riverside
Nonprofits in Riverside, CT: 75 registered with the IRS
75 nonprofits are registered with the IRS in Riverside, CT, 72 of them 501(c)(3) charities; the 22 that report revenue took in $31.8 million. The largest by revenue: Greenwich Emergency Medical Service Incorporated ($10.5 million), Riverside Yacht Club Inc ($8.7 million), Childrens Day School Inc ($4.4 million). Most common causes: philanthropy, voluntarism and grantmaking foundations (20), education (11), recreation and sports (8).
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Every organization, largest by revenue first
| Organization | Category | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Greenwich Emergency Medical Service Incorporated | 501(c)(3) | 1986 | $10.5 million | $13.9 million | 2025-04 | |
| Riverside Yacht Club Inc | 501(c)(7) | 1935 | $8.7 million | $12.4 million | 2025-09 | |
| Childrens Day School Inc | Education | 501(c)(3) | 1985 | $4.4 million | $4.2 million | 2025-08 |
| The Transportation Association of Greenwich Inc | Human services | 501(c)(3) | 1999 | $1.9 million | $1.6 million | 2024-06 |
| Hill House Inc | Housing and shelter | 501(c)(3) | 1979 | $1.6 million | $12.5 million | 2025-06 |
| Heart Care International Inc | International, foreign affairs and national security | 501(c)(3) | 1998 | $1.4 million | $5.1 million | 2024-12 |
| Religion Media Company | Arts, culture and humanities | 501(c)(3) | 2021 | $867,223 | $667,230 | 2025-12 |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $561,184 | $396,273 | 2026-06 | |
| Greenwich Sailing School Inc | Recreation and sports | 501(c)(3) | 2022 | $288,730 | $102,131 | 2024-12 |
| Jenga USA Inc | International, foreign affairs and national security | 501(c)(3) | 2019 | $258,943 | $24,890 | 2025-12 |
| Pta Connecticut Congress | 501(c)(3) | 1955 | $210,513 | $194,424 | 2026-06 | |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $193,512 | $221,908 | 2026-06 | |
| Humanitarian Organization for Physical Education Inc | Youth development | 501(c)(3) | 2016 | $191,405 | $189,678 | 2025-12 |
| Ptsa Connecticut Inc | 501(c)(3) | 1955 | $146,036 | $153,127 | 2026-06 | |
| Shidogakuin LTD | 501(c)(3) | 1993 | $112,872 | $39,070 | 2025-06 | |
| Opin Inc | Animal-related | 501(c)(3) | 2007 | $112,779 | $640,736 | 2024-12 |
| Chinese Language School of Connecticut Inc | Education | 501(c)(3) | 2003 | $104,167 | $97,273 | 2025-07 |
| GHS Diamond Club Inc | Recreation and sports | 501(c)(3) | 2022 | $100,581 | $43,873 | 2025-10 |
| GHS Boys Hockey | Recreation and sports | 501(c)(3) | 2018 | $97,197 | $50,613 | 2025-12 |
| Fairfield County Swimming League | Recreation and sports | 501(c)(3) | 2008 | $42,723 | $67,714 | 2025-12 |
| Cookie for A Cause Inc | Human services | 501(c)(3) | 2025 | $25,921 | $17,971 | 2025-12 |
| The Complex Sag Harbor Inc | Arts, culture and humanities | 501(c)(3) | 2021 | $29 | $15.4 million | 2024-06 |
| Accessitas Inc | Medical research | 501(c)(3) | 2026 | |||
| Armstrong Angel Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2016 | $13.1 million | 2024-12 | |
| Bags To Riches Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2026 | |||
| Berger Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2012 | $6.2 million | 2025-12 | |
| Bytebloom Robotics Inc | Education | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Children Helping Children Association | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Coleman Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $12.3 million | 2025-12 | |
| Columbia University Club Foundation Inc | Education | 501(c)(3) | 1949 | $1.9 million | 2025-10 | |
| Congregation Shir Ami | Religion-related | 501(c)(3) | 2004 | |||
| Connecticut Society of Portrait Artists | Arts, culture and humanities | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Consultation On Common Texts Inc | Religion-related | 501(c)(3) | 2002 | |||
| Crow Hill Foundation Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1997 | $10.9 million | 2025-12 | |
| Digital Dreamers Foundation Inc | Education | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Dogwood Park Association Inc | Environment | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Eleni Vavas Memorial Fund Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $0 | $0 | 2024-12 |
| Fairfield County Womens Tennis League | Recreation and sports | 501(c)(7) | 2014 | $0 | $0 | 2025-12 |
| Federated Garden Clubs of Connecticut Inc | 501(c)(3) | 1967 | $0 | $0 | 2025-09 | |
| Figgie Family Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2020 | $791,230 | 2025-12 | |
| Food for Fairfield Inc | Human services | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Friends Lake Property Owners Association Inc | 501(c)(3) | 1988 | $0 | $0 | 2025-06 | |
| Fulton Michalik Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2016 | $8.2 million | 2025-12 | |
| GHS Orchestra Association | Education | 501(c)(3) | 2015 | $0 | $0 | 2026-06 |
| Genyx Society for Reproductive Medicine Inc | Education | 501(c)(3) | 2025 | |||
| Greenwich Newcomers & Neighbors Inc | 501(c)(7) | 1994 | $0 | $0 | 2026-06 | |
| Harvard Club of Fairfield County Inc | 501(c)(3) | 1976 | $0 | $0 | 2025-06 | |
| Helping Hand Foundation Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $1.4 million | 2024-12 | |
| Henry & Birdie Cohen Fund | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2002 | $75,021 | 2025-04 | |
| I3 Foundation Inc | Community improvement and capacity building | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Ibex Peak Foundation Inc | Education | 501(c)(3) | 2017 | $2,489 | 2025-12 | |
| KDK Charitable Trust | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $4.8 million | 2024-12 | |
| Korobkin Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1998 | $250,222 | 2024-12 | |
| Mollie Parnis Livingston Foundation Inc | 501(c)(3) | 1969 | $3.9 million | 2025-12 | ||
| My Stem Help Inc | Education | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Ocean Blue Sailing Foundation | Recreation and sports | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Ogc Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2015 | $7 million | 2025-12 | |
| Ok To Delay Incorporated | Youth development | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Old Greenwich Riverside Cheerleading Inc | Recreation and sports | 501(c)(3) | 2021 | $7,882 | 2023-12 | |
| Pardi Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2026 | |||
| Parent Booster USA Inc | Education | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Pitch Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $157.3 million | 2025-12 | |
| Pto of the Japanese School of New York Inc | Education | 501(c)(3) | 2022 | $0 | $0 | 2026-03 |
| Raymond Han and Paul Kellogg Foundation Inc | Arts, culture and humanities | 501(c)(3) | 2019 | $3 million | 2025-12 | |
| Remnant Ministries Inc | Religion-related | 501(c)(3) | 2022 | |||
| Save the Choc Corporation | Environment | 501(c)(3) | 2025 | $0 | $0 | 2026-01 |
| Slaters Lane Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| St Catherine of Siena and St Agnes Parish Corp | 501(c)(3) | 1946 | ||||
| Stevens McCormack Family Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2026 | |||
| TRC Assist Inc | Human services | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| The Curtis Foundation | Youth development | 501(c)(3) | 2019 | $16,876 | 2024-12 | |
| Westchester Speech Hearing and Language Association | Mental health and crisis intervention | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Wild Works Connects | Recreation and sports | 501(c)(3) | 2022 | $0 | $0 | 2025-01 |
| William J and Frances E Deutsch Charitable Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2004 | $21.8 million | 2025-12 | |
| Winderful Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2023 | $22.2 million | 2024-12 |
By cause in Riverside, CT
- Philanthropy, voluntarism and grantmaking foundations 20
- Education 11
- Recreation and sports 8
- Arts, culture and humanities 4
- Human services 4
- Religion-related 3
- Youth development 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.