Data / Nonprofits / Illinois / O Fallon
Nonprofits in O Fallon, IL: 164 registered with the IRS
164 nonprofits are registered with the IRS in O Fallon, IL, 120 of them 501(c)(3) charities; the 38 that report revenue took in $83.2 million. The largest by revenue: Washington University Physicians in Illinois Inc ($41.4 million), Employers and Operating Engineers-520 Health and Welfare F ($29.4 million), International Union of Bricklayers and Allied Craftworkers ($2.4 million). Most common causes: education (21), human services (17), recreation and sports (14).
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Every organization, largest by revenue first
| Organization | Category | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Washington University Physicians in Illinois Inc | Health care | 501(c)(3) | 2019 | $41.4 million | $17.1 million | 2025-06 |
| Employers and Operating Engineers-520 Health and Welfare F | 501(c)(9) | 1964 | $29.4 million | $64.1 million | 2024-12 | |
| International Union of Bricklayers and Allied Craftworkers | 501(c)(5) | 1940 | $2.4 million | $2.6 million | 2025-12 | |
| Southern Illinois Builders Association | 501(c)(6) | 1991 | $1.7 million | $2.7 million | 2025-12 | |
| Southern Illinois Construction Advancement Program | 501(c)(6) | 1991 | $1.3 million | $5.3 million | 2025-08 | |
| Si Ice Hawks Hockey | Recreation and sports | 501(c)(3) | 2024 | $922,940 | $439,757 | 2025-09 |
| Discovery | 501(c)(3) | 1980 | $850,399 | $847,265 | 2025-06 | |
| Bricklayers Local 8 of Illinois Apprenticeship | Education | 501(c)(3) | 2021 | $759,642 | $2.3 million | 2025-12 |
| Ofallon Panther Band Boosters Inc | Education | 501(c)(3) | 2002 | $595,629 | $613,192 | 2025-04 |
| Karla Smith Foundation | Mental health and crisis intervention | 501(c)(3) | 2024 | $521,456 | $440,157 | 2025-12 |
| Knights of Columbus Council Ofallon | 501(c)(7) | 1964 | $337,039 | $381,255 | 2025-06 | |
| Ofallon-Shiloh Chamber of Commerce Incorporated | 501(c)(6) | 1976 | $333,219 | $249,537 | 2025-12 | |
| Ofallon Fire Department of Ofallon Illinois | 501(c)(3) | 1989 | $237,503 | $996,807 | 2025-12 | |
| Fraternal Order of Police | 501(c)(8) | 1952 | $201,285 | $612,639 | 2025-12 | |
| Society of St Vincent de Paul | Human services | 501(c)(3) | 2019 | $191,677 | $66,904 | 2025-09 |
| Royal Order of Jesters | 501(c)(10) | 1941 | $183,057 | $149,884 | 2025-12 | |
| Central Youth Outreach NFP | Religion-related | 501(c)(3) | 2008 | $163,265 | $4,051 | 2025-12 |
| Soulcial Solutions Foundation | Human services | 501(c)(3) | 2022 | $160,738 | $26,081 | 2025-12 |
| O Fallon Community Food Pantry Inc | Human services | 501(c)(3) | 2004 | $144,024 | $308,695 | 2024-12 |
| Ofallon Little Panthers Football & Cheerleading Club | Recreation and sports | 501(c)(3) | 2003 | $141,645 | $83,281 | 2024-12 |
| Ofallon High School Endowment Fund LTD | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 1999 | $138,233 | $1.6 million | 2025-12 |
| Mike Kelley Foundation | Recreation and sports | 501(c)(3) | 2016 | $115,860 | $298,503 | 2022-12 |
| Ancient Free & Accepted Masons of Illinois | 501(c)(10) | 1972 | $79,024 | $469,404 | 2025-12 | |
| American Legion 0137 Fischer- Sollis Post | 501(c)(19) | 1946 | $75,620 | $115,684 | 2025-06 | |
| Joshuas Great Things Foundation | Diseases, disorders and medical disciplines | 501(c)(3) | 2013 | $74,424 | $47,705 | 2025-12 |
| Metro East Landlords Association | Employment | 501(c)(6) | 2014 | $71,158 | $322,190 | 2024-12 |
| Swing Fore Hope | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2008 | $70,933 | $36,432 | 2024-12 |
| Friends of the Ofallon Public Library | Education | 501(c)(3) | 2020 | $68,471 | $204,007 | 2025-12 |
| St Clair County VBC | Recreation and sports | 501(c)(3) | 2026 | $66,693 | $77,306 | 2024-10 |
| Ofallon Sportsmans Club | Recreation and sports | 501(c)(7) | 2024 | $64,851 | $345,807 | 2025-12 |
| Rotary Intennational | 501(c)(4) | 1958 | $60,533 | $48,773 | 2025-06 | |
| Living LFS Inc | Diseases, disorders and medical disciplines | 501(c)(3) | 2015 | $60,198 | $42,062 | 2024-12 |
| St Louis Agri Business Club | 501(c)(6) | 1998 | $50,236 | $58,919 | 2026-06 | |
| Pto Il Ofallon Estelle Kampmeyer | Education | 501(c)(3) | 2024 | $43,863 | $21,135 | 2025-06 |
| District 90 PTD Presidents | Education | 501(c)(3) | 2022 | $31,716 | $41,629 | 2024-06 |
| Once Upon A Prayer | Animal-related | 501(c)(3) | 2016 | $30,971 | $36,839 | 2023-12 |
| Operating Engineers 520 Vacation Fund | 501(c)(9) | 1980 | $16,316 | $489,270 | 2024-12 | |
| Douthitt Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2021 | $6,000 | $722 | 2024-12 |
| 618 No Days Off Foundation | Youth development | 501(c)(3) | 2026 | |||
| 72 Acts of Kindness | Education | 501(c)(3) | 2026 | |||
| A Kut of Kindness NFP | Education | 501(c)(3) | 2024 | |||
| Aesops Attic Inc | Education | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Air Force Sergeants Association | 501(c)(19) | 1972 | ||||
| American Federation of State County & Municipal Employees | 501(c)(5) | 1957 | $0 | $0 | 2024-12 | |
| American Federation of Teachers | 501(c)(5) | 1945 | $0 | $0 | 2024-06 | |
| American Federation of Teachers | 501(c)(5) | 1945 | $0 | $0 | 2026-06 | |
| American Federation of Teachers | 501(c)(5) | 1945 | $0 | $0 | 2025-06 | |
| American Federation of Teachers | 501(c)(5) | 1945 | $0 | $0 | 2025-08 | |
| American Federation of Teachers | 501(c)(5) | 1967 | $0 | $0 | 2025-07 | |
| American Federation of Teachers | 501(c)(5) | 1945 | $0 | $0 | 2024-12 | |
| American Federation of Theachers | Education | 501(c)(5) | 1967 | $0 | $0 | 2024-06 |
| American Wolkssport Association Inc | 501(c)(3) | 1987 | $0 | $0 | 2025-12 | |
| Ancient Order of Hibernians in America | 501(c)(8) | 1945 | $0 | $0 | 2026-06 | |
| Assembly of God | 501(c)(3) | 1964 | ||||
| Aubrey Osullivan Foundation - To Cure Reducing Body Myopathy Inc | Medical research | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Believe Memorial Foundation | Medical research | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Belle Clair Rotary Foundation | Education | 501(c)(3) | 2002 | $0 | $0 | 2025-06 |
| Benefits4life Inc | Education | 501(c)(3) | 2026 | |||
| Blessed Savior Lutheran Church | 501(c)(3) | 1941 | ||||
| Bni St Clair County | Community improvement and capacity building | 501(c)(6) | 2018 | $0 | $0 | 2025-09 |
| Bombers Athletic Association | Recreation and sports | 501(c)(3) | 2024 | |||
| Buffalo Soldiers Motorcycle Club Southwest Illinois | Youth development | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Career Pathways of Southern Illinois | 501(c)(3) | 2023 | $0 | $0 | 2024-12 | |
| Central 104 Pto | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2025 | $0 | $0 | 2024-07 |
| Central Christian Church | 501(c)(3) | 1971 | ||||
| Charis Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2017 | $29,860 | 2024-12 | |
| Delta Kappa Gamma Society | 501(c)(6) | 1970 | $0 | $0 | 2026-06 | |
| Disciple Fellowship Christian Church Inc | Religion-related | 501(c)(3) | 2005 | |||
| District 90 Pto President | Education | 501(c)(3) | 2021 | $0 | $0 | 2025-06 |
| Early Childhood Development Foundation Inc | Education | 501(c)(3) | 2022 | $0 | $0 | 2025-06 |
| Edmistone Health Alliance | Health care | 501(c)(3) | 2016 | $0 | $1 | 2023-12 |
| Edward Fulton Junior High Pto | 501(c)(3) | 1995 | $0 | $0 | 2025-12 | |
| Emmanuels Inc NFP | Community improvement and capacity building | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Faith Lutheran Church | 501(c)(3) | 1987 | 2024-12 | |||
| Faith United Baptist Church | Religion-related | 501(c)(3) | 2005 | |||
| First Baptist Church of Ofallon | 501(c)(3) | 1970 | ||||
| Flagmans Mission Continues | Human services | 501(c)(3) | 2021 | $0 | $0 | 2026-06 |
| Four Hearts Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Glow for Hope NFP | Mental health and crisis intervention | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Henry Mace Burial Ground | Mutual and membership benefit | 501(c)(13) | 2015 | $0 | $0 | 2025-12 |
| Heritage Arts Cooperative | Arts, culture and humanities | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Heroes of the Metro East | Public and societal benefit | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Hooked On Hope NFP | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2020 | $0 | $0 | 2024-12 |
| Hope House of Southern Illinois | Human services | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Horizon Hope Counseling Inc | Mental health and crisis intervention | 501(c)(3) | 2013 | $0 | $0 | 2023-12 |
| Hudson-Essex Terraplane Club Inc | 501(c)(7) | 1974 | $0 | $0 | 2025-12 | |
| Hugh J White Chapter Tuskegee Airmen Inc | Public safety, disaster preparedness and relief | 501(c)(3) | 2014 | $0 | $0 | 2026-01 |
| Illinois Federation of Dog Clubs and Owners | Community improvement and capacity building | 501(c)(7) | 2011 | $0 | $0 | 2025-10 |
| Illinois Future Basketball Club | Recreation and sports | 501(c)(3) | 2026 | |||
| Illinois State Grange | 501(c)(8) | 1972 | $0 | $0 | 2025-12 | |
| Illinois State Grange | 501(c)(8) | 1943 | $0 | $0 | 2025-08 | |
| It Makes Makes Cents Now | Human services | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Japanese Institute of St Louis | Arts, culture and humanities | 501(c)(3) | 2024 | |||
| Jarrot Mansion Project Inc | Arts, culture and humanities | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Jennifer Mueller Memorial Foundation | Education | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| John Wilt Foundation | Education | 501(c)(3) | 2011 | $0 | $0 | 2024-01 |
| Kiss My Glass Recycling NFP | Environment | 501(c)(3) | 2026 | |||
| Kiwanis International Inc | 501(c)(4) | 1961 | $0 | $0 | 2025-09 | |
| Knights of Columbus | 501(c)(8) | 1940 | $0 | $0 | 2025-06 | |
| Korean-American Association of Scott Area Inc | Human services | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Lifelong Music in Ofallon Schools | Education | 501(c)(3) | 2014 | $0 | $0 | 2026-05 |
| Love Them All | Human services | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| MB Foundation | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | |||
| Metro East Literacy Project | Education | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Metro East Momco | Youth development | 501(c)(3) | 2025 | $0 | $0 | 2026-06 |
| Metro East Patriots Day Committee | Recreation and sports | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Metro East Realtist Collective | Mutual and membership benefit | 501(c)(6) | 2025 | $0 | $0 | 2025-12 |
| Mid-America Figure Skating Academy | Recreation and sports | 501(c)(3) | 2023 | $0 | $0 | 2025-06 |
| Ministerio Apostolico Nido de Aguilas Inc | Religion-related | 501(c)(3) | 2024 | |||
| Mission 2819 Inc | Religion-related | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Mission X Market | Community improvement and capacity building | 501(c)(3) | 2024 | $0 | $1 | 2025-12 |
| Muse Room Inc | Arts, culture and humanities | 501(c)(3) | 2023 | $0 | $0 | 2026-02 |
| Music for Life Alliance Inc | Arts, culture and humanities | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| National Society of the Daughters of the American Revolution | 501(c)(3) | 1949 | $0 | $0 | 2025-12 | |
| National Society of the Daughters of the American Revolution | 501(c)(3) | 1938 | $0 | $0 | 2025-12 | |
| New Salem Baptist District Association | Religion-related | 501(c)(3) | 1999 | |||
| Nextgen Athletes Foundation | Recreation and sports | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| O Fallon Neighbors | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| O Fallon Veterans Monument Association Inc | Arts, culture and humanities | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| O Fallon Womans Club Inc | 501(c)(3) | 1994 | $0 | $0 | 2026-05 | |
| Ofallon Apostolic Assembly | 501(c)(3) | 1988 | ||||
| Ofallon Booster Club Inc | 501(c)(4) | 1978 | $0 | $0 | 2025-12 | |
| Ofallon Chapter 2281 Women of the Moose | 501(c)(8) | 1940 | $0 | $0 | 2026-04 | |
| Ofallon Historical Society Inc | 501(c)(3) | 1992 | $0 | $0 | 2025-12 | |
| Ofallon Jr High School Athletic-Extracurricular Booster C | Education | 501(c)(3) | 2014 | $0 | $0 | 2023-06 |
| Ofallon Parks & Recreationfoundation | Recreation and sports | 501(c)(3) | 2026 | $0 | $0 | 2022-04 |
| Ofallon Underwater Search and Recovery Team | Human services | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Order of the Eastern Star of Illinois | 501(c)(10) | 1940 | $0 | $0 | 2025-12 | |
| Partner in Missions Inc | Religion-related | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Patriotic Sisters of the USA Inc | Human services | 501(c)(3) | 2007 | $0 | $0 | 2024-12 |
| Peters Place Foundation NFP | Human services | 501(c)(3) | 2011 | $0 | $0 | 2026-08 |
| Pratcher-Davis Foundation | Education | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Prophecy Charity Riders II | Human services | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| RRR Sanctuary | Animal-related | 501(c)(3) | 2025 | |||
| Reeds Rescue Ranch | Animal-related | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Renewed Life Ministries | Religion-related | 501(c)(3) | 2025 | |||
| Roc N Robe RTG | Recreation and sports | 501(c)(3) | 2022 | $2,154 | 2025-12 | |
| Rotary International | 501(c)(4) | 1966 | $0 | $0 | 2025-06 | |
| Rotary International | 501(c)(4) | 1942 | $0 | $0 | 2025-06 | |
| Save Our Strays NFP | Human services | 501(c)(3) | 2005 | $0 | $0 | 2023-12 |
| Science and Technology Education Project NFP | Youth development | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| Shoppes at Green Mount Association Inc | Community improvement and capacity building | 501(c)(6) | 2013 | $0 | $0 | 2025-12 |
| Sisters in Service Greater St Louis | Public and societal benefit | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Society of American Military Engineers | 501(c)(3) | 1961 | $0 | $0 | 2024-12 | |
| Sons of Union Veterans of the Civil War | 501(c)(4) | 1941 | $0 | $0 | 2025-12 | |
| Southern Illinois Cardiovascular Facility Inc | 501(c)(3) | 1992 | $0 | $441,136 | 2023-12 | |
| Southern Illinois First | Education | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Spencer Pet Rescue | Animal-related | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| St Clair County Black Chamber of Commerce Inc | Community improvement and capacity building | 501(c)(6) | 2019 | $0 | $0 | 2023-12 |
| St Clare Roman Catholic Church | 501(c)(3) | 1946 | ||||
| St Josephs Burial Association | 501(c)(13) | 1951 | $0 | $0 | 2025-12 | |
| Supporting Our Heros Foundation | Human services | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| The Kreilick Family Foundation Inc | Philanthropy, voluntarism and grantmaking foundations | 501(c)(3) | 2000 | $1.2 million | 2025-12 | |
| This Grow Round | Human services | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Toastmasters International | 501(c)(3) | 1945 | $0 | $0 | 2025-12 | |
| Toastmasters International | 501(c)(3) | 1945 | $0 | $0 | 2025-12 | |
| Toastmasters International | 501(c)(3) | 1962 | $0 | $0 | 2025-12 | |
| Todays Affirmations Charitable Foundation | Housing and shelter | 501(c)(3) | 2025 | |||
| Urban City Lights NFP | Human services | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Whats the Formula Mentoring Academy | Education | 501(c)(3) | 2026 | |||
| Without Limits - Team Galaxy | Recreation and sports | 501(c)(3) | 2025 | |||
| Women Walking Empowered | Human services | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Wrecking Crew | Recreation and sports | 501(c)(3) | 2025 | |||
| Ymk 2028 Incorporated | Youth development | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
By cause in O Fallon, IL
- Education 21
- Human services 17
- Recreation and sports 14
- Philanthropy, voluntarism and grantmaking foundations 10
- Religion-related 8
- Arts, culture and humanities 6
- Community improvement and capacity building 6
- Youth development 5
- Animal-related 4
- Mental health and crisis intervention 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.