Data / Nonprofits / Wisconsin / Windsor
Nonprofits in Windsor, WI: 31 registered with the IRS
31 nonprofits are registered with the IRS in Windsor, WI, 28 of them 501(c)(3) charities; the 14 that report revenue took in $6.8 million. The largest by revenue: Psychonomic Society Inc ($2.8 million), Society for Research On Nicotine and Tobacco ($1.5 million), Psychometric Society Educational Testing Service ($433,523). Most common causes: recreation and sports (4), arts, culture and humanities (3).
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Every organization, largest by revenue first
| Organization | Category | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Psychonomic Society Inc | Mental health and crisis intervention | 501(c)(3) | 1962 | $2.8 million | $13.5 million | 2025-12 |
| Society for Research On Nicotine and Tobacco | Medical research | 501(c)(3) | 1999 | $1.5 million | $1.6 million | 2024-12 |
| Psychometric Society Educational Testing Service | Social science | 501(c)(3) | 2020 | $433,523 | $787,998 | 2024-12 |
| Mycological Society of America the | 501(c)(3) | 1965 | $327,543 | $2.5 million | 2024-12 | |
| American Osteopathic Academy of Sports Medicine Inc | 501(c)(3) | 1993 | $296,530 | $151,272 | 2025-12 | |
| American Association of Veterinary Parasitologists | Science and technology | 501(c)(3) | 2007 | $267,026 | $326,498 | 2024-12 |
| American Society for Veterinary Clinical Pathology | 501(c)(3) | 1969 | $240,481 | $458,823 | 2025-06 | |
| International Society of Psych Mental Health Nurses | 501(c)(6) | 1977 | $225,927 | $84,420 | 2025-06 | |
| Association of University Cardiologists Inc | 501(c)(3) | 1985 | $213,500 | $218,321 | 2025-03 | |
| Society of Systematic Biologists | 501(c)(3) | 1951 | $190,078 | $1.9 million | 2024-12 | |
| Association of Ringside Physicians Inc | Community improvement and capacity building | 501(c)(6) | 2002 | $145,738 | $212,637 | 2024-12 |
| Society for Clinical and Medical Hair Removal Inc | 501(c)(6) | 1991 | $52,317 | $108,848 | 2025-06 | |
| Deforest Windsor Food Pantry Inc | Food, agriculture and nutrition | 501(c)(3) | 2019 | $38,217 | $80,281 | 2025-12 |
| Ispn Foundation | Community improvement and capacity building | 501(c)(3) | 2004 | $8,117 | $62,942 | 2025-06 |
| Association of Professors of Cardiology | Education | 501(c)(3) | 1991 | $0 | $0 | 2024-12 |
| Boy Scout Troop 155 Foundation Inc | Youth development | 501(c)(3) | 2023 | $33,503 | 2026-03 | |
| Capital City Dance Collective Inc | Arts, culture and humanities | 501(c)(3) | 2024 | $0 | $0 | 2026-06 |
| Clack Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $35.6 million | 2025-12 | |
| Council for Tobacco Treatment Training Programs Inc | Mental health and crisis intervention | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Cultural Connections Foundation Inc | Arts, culture and humanities | 501(c)(3) | 2026 | |||
| Deforest Area Tennis Association | Recreation and sports | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Deforest Area Youth Boys Basketball Inc | Recreation and sports | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Deforest Boys Volleyball Club Inc | Recreation and sports | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| International Society for Animal Clinical Pathology | Animal-related | 501(c)(3) | 2004 | $0 | $0 | 2025-06 |
| Legaci Inc | Human services | 501(c)(3) | 2024 | |||
| Malcolm Stack Foundation Inc | Environment | 501(c)(3) | 2001 | $8.9 million | 2025-12 | |
| Raza-E-Mustafa Islamic Center Inc | Religion-related | 501(c)(3) | 2010 | |||
| Token Creek Watershed Association | Arts, culture and humanities | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Windsor Community Boys Baseball League | Recreation and sports | 501(c)(3) | 2016 | $0 | $0 | 2025-09 |
| Windsor Parent Teacher Organization | Education | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| Wisconsin Wildlife Rehabilitators Association Inc | Animal-related | 501(c)(3) | 1994 | $0 | $0 | 2025-12 |
By cause in Windsor, WI
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.