Data / Nonprofits / Wisconsin / Mazomanie
Nonprofits in Mazomanie, WI: 33 registered with the IRS
33 nonprofits are registered with the IRS in Mazomanie, WI, 28 of them 501(c)(3) charities; the 6 that report revenue took in $1.1 million. The largest by revenue: Wisconsin State Firefighters Association Inc of Wisconsin ($351,127), Amazon Medical Project Inc ($326,004), Mazomanie Charitable Alliance Inc ($324,046). Most common causes: arts, culture and humanities (6), education (3), recreation and sports (3).
SpecStream is the live web data engine for teams and agents. It reads the IRS register of exempt organizations as the IRS updates it, and this page is that reading. Ask for the nonprofits you need by place, cause and size, with their latest Form 990 figures and websites, and they arrive in your sheet, CRM, Slack or agent.
Every organization, largest by revenue first
| Organization | Category | Type | Since | Revenue | Assets | Filing |
|---|
| Wisconsin State Firefighters Association Inc of Wisconsin | | 501(c)(4) | 1969 | $351,127 | $315,729 | 2025-06 |
| Amazon Medical Project Inc | International, foreign affairs and national security | 501(c)(3) | 1996 | $326,004 | $418,227 | 2024-12 |
| Mazomanie Charitable Alliance Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2013 | $324,046 | $33,425 | 2024-12 |
| Mazomanie Wild West Days Assoc Inc | Public and societal benefit | 501(c)(3) | 2017 | $91,315 | $44,319 | 2025-12 |
| Wolf Run Association Incorporated | Environment | 501(c)(3) | 2012 | $18,296 | $25,107 | 2024-12 |
| University of Wisconsin Employees Inc University of Wisconsin | | 501(c)(9) | 1961 | $6,084 | $14,792 | 2025-09 |
| American Legion Auxiliary | | 501(c)(19) | 1946 | $0 | $0 | 2025-12 |
| Calvary Community Chapel of Mazomanie Inc | | 501(c)(3) | 1989 | | | |
| Center for Knit and Crochet Inc | Arts, culture and humanities | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Curtiss Street Bible Fellowship | | 501(c)(3) | 1964 | | | |
| Friends of Ukraine - Madison Inc | Arts, culture and humanities | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Friends of the Mazomanie Free Library | | 501(c)(3) | 1982 | $0 | $0 | 2023-04 |
| Holy Cross Congregation Iowa Dane County Wi Inc | | 501(c)(3) | 1946 | | | 2012-12 |
| International Association of Lions Clubs | | 501(c)(4) | 1966 | $0 | $0 | 2026-06 |
| Knights of Columbus | | 501(c)(8) | 1940 | $0 | $0 | 2025-12 |
| Mazomanie Barracudas Swim Booster Club Inc | Recreation and sports | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Mazomanie Historical Society Inc | | 501(c)(3) | 1968 | $0 | $0 | 2025-12 |
| Mazomanie Music Conservancy | Arts, culture and humanities | 501(c)(3) | 2014 | $0 | $0 | 2026-02 |
| National Society of the Children of the American Revolution | Arts, culture and humanities | 501(c)(3) | 1973 | $0 | $0 | 2026-02 |
| National Society of the Children of the American Revolution | | 501(c)(3) | 1973 | $0 | $0 | 2026-02 |
| National Society of the Children of the American Revolution | | 501(c)(3) | 1973 | $0 | $0 | 2026-02 |
| National Society of the Children of the American Revolution | | 501(c)(3) | 1973 | $0 | $0 | 2026-02 |
| National Society of the Children of the American Revolution | | 501(c)(3) | 1973 | $0 | $0 | 2026-02 |
| New Heights Lutheran Church | | 501(c)(3) | 1988 | | | |
| Shenanigans | Arts, culture and humanities | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| St John-St Paul Lutheran Church | | 501(c)(3) | 1988 | | | |
| St Johns Lutheran Church | | 501(c)(3) | 1988 | | | |
| Wisconsin Heights Baseball Club Inc | Recreation and sports | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Wisconsin Heights Music Parents Association | Education | 501(c)(3) | 2017 | $0 | $0 | 2025-06 |
| Wisconsin Heights Parent-Teacher Organization | Education | 501(c)(3) | 2011 | $0 | $0 | 2026-06 |
| Wisconsin Heights School District Endowment Fund | Education | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Wisconsin Heights Youth Basketball Inc | Recreation and sports | 501(c)(3) | 2023 | | $25,449 | 2024-12 |
| Wisconsin Screenwriters Forum Inc | Arts, culture and humanities | 501(c)(3) | 1993 | $0 | $0 | 2024-12 |
By cause in Mazomanie, 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.