Nonprofits in Wisconsin
Nonprofits in Wisconsin. Browse 46,682 public nonprofit profiles. Review organization identities, available filing years, and their complete CharitySense profiles.
Location refers to headquarters recorded in public sources, not an organization’s service area. Classification describes its reported category and does not assess its effectiveness.
Nonprofit profiles
- One Starfish Rehoming Connections Inc
EIN 262823843 · Headquarters: COLUMBUS, WI, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- One Step at a Time Inc
EIN 272969841 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2012 · Primary form: IRS Form 990-N
- One Waupun Inc
EIN 862065062 · Headquarters: WAUPUN, WI, US · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- One Wisconsin Now Inc
EIN 203765839 · Headquarters: MADISON, WI, USA · Civil Rights, Social Action & Advocacy · Latest available filing year: 2018 · Primary form: IRS Form 990
- One Wrightstown
EIN 830925956 · Headquarters: Wrightstown, WI, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Onedenmark Inc
EIN 873223455 · Headquarters: GREEN BAY, WI, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990
- Onefest Ltd
EIN 820922837 · Headquarters: CADOTT, WI, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990
- OneHope27 Inc
EIN 463664191 · Headquarters: Milwaukee, WI, USA · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990
- Oneida Chamber of Commerce Inc
EIN 451840883 · Headquarters: GREEN BAY, WI, US · Community Improvement & Capacity Building · Latest available filing year: 2011 · Primary form: IRS Form 990-N
- Oneida County Atv Utv Council Inc
EIN 842556684 · Headquarters: GLEASON, WI, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oneida County Biking and Walking Trails Council Inc
EIN 391965173 · Headquarters: Rhinelander, WI, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oneida County Economic Development Corp
EIN 391637294 · Headquarters: Rhinelander, WI, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990
- Oneida County Fair Committee Inc
EIN 852902805 · Headquarters: RHINELANDER, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ
- Oneida County Firefighters Association Inc
EIN 391630628 · Headquarters: Rhinelander, WI, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2009 · Primary form: IRS Form 990-N
- Oneida County Humane Society
EIN 391312508 · Headquarters: Rhinelander, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990
- Oneida County Lakes and Rivers Association Inc
EIN 813545944 · Headquarters: Hazelhurst, WI, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oneida Golf and Country Club Inc
EIN 390518065 · Headquarters: GREEN BAY, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990
- Oneida Indian Historical Society Inc
EIN 205056335 · Headquarters: Oneida, WI, US · Arts, Culture & Humanities · Latest available filing year: 2011 · Primary form: IRS Form 990-N
- Oneida Vilas
EIN 320360722 · Headquarters: Richfield, WI, US · Health Care · Latest available filing year: 2015 · Primary form: IRS Form 990-N
- Oneil-hyde Foundation
EIN 821570569 · Headquarters: MENOMONEE FALLS, WI, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oneill Foundation Inc
EIN 260456310 · Headquarters: BURLINGTON, WI, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF
- Onemaker Inc
EIN 205673998 · Headquarters: Sussex, WI, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oneness Awareness Inc
EIN 472423859 · Headquarters: Manitowoc, WI, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oneness School Initiative Inc
EIN 454486904 · Headquarters: Waukesha, WI, US · Education · Latest available filing year: 2018 · Primary form: IRS Form 990-N
- Oneota Housing Inc
EIN 237183641 · Headquarters: LA CROSSE, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990
- Onepillkills Inc
EIN 881352563 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Onesimus Group Milwaukee
EIN 873342462 · Headquarters: milwaukee, WI, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Ong First Friends Church Trust
EIN 930548829 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Oni Dance
EIN 510653818 · Headquarters: SHOREWOOD, WI, USA · Arts, Culture & Humanities · Latest available filing year: 2011 · Primary form: IRS Form 990
- Only God Can House of Peace Inc
EIN 870736467 · Headquarters: Milwaukee, WI, US · Housing & Shelter · Latest available filing year: 2013 · Primary form: IRS Form 990-N
- Only in Wisconsin Giving Inc
EIN 862470197 · Headquarters: NEW GLARUS, WI, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Only See Relief Grief Support and S Ervices Inc
EIN 414674865 · Headquarters: Milwaukee, WI, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Onramp Inc
EIN 300590876 · Headquarters: Glendale, WI, US · Employment · Latest available filing year: 2016 · Primary form: IRS Form 990-N
- Onward and Upward
EIN 821594584 · Headquarters: Turtle Lake, WI, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Onward Clintonville
EIN 932895974 · Headquarters: Clintonville, WI, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Onyeabor Family Foundation Inc
EIN 863063995 · Headquarters: La Crosse, WI, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Onyx Foundation Inc
EIN 843009191 · Headquarters: STAR PRAIRIE, WI, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990
- Oolong Dachshund Rescue Inc
EIN 270229680 · Headquarters: Oconto, WI, US · Animal Related · Latest available filing year: 2020 · Primary form: IRS Form 990-N
- Oostburg Area United Fund Inc
EIN 391305307 · Headquarters: OOSTBURG, WI, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Oostburg Athletic Association
EIN 364604999 · Headquarters: OOSTBURG, WI, US · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Oostburg Christian School Association
EIN 390845692 · Headquarters: OOSTBURG, WI, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990
- Oostburg Community Educational Foundation Inc
EIN 300244612 · Headquarters: Oostburg, WI, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Oostburg Education Association
EIN 753267758 · Headquarters: MADISON, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Oostburg Presbyterian Church Reserve Trust
EIN 462640886 · Headquarters: Oostburg, WI, USA · Religion Related · Latest available filing year: 2015 · Primary form: IRS Form 990
- Oostburg Pto Inc
EIN 471894690 · Headquarters: OOSTBURG, WI, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Opal Carl Charitable Trust R75406000 3660156600
EIN 726151330 · Headquarters: MILWAUKEE, WI, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2010 · Primary form: IRS Form 990-PF
- Opals
EIN 393473054 · Headquarters: FRANKLIN, WI, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Opca Shelter Network Alliance Inc
EIN 822878454 · Headquarters: MILWAUKEE, WI, US · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- OPEIU Local 9
EIN 390513924 · Headquarters: Milwaukee, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990
- Open Arms Charities of Elroy Inc
EIN 842580591 · Headquarters: Elroy, WI, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Arms Free Clinic Inc
EIN 454475625 · Headquarters: ELKHORN, WI, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990
- Open Door
EIN 900671797 · Headquarters: WAUSAU, WI, US · Crime & Legal Related · Latest available filing year: 2022 · Primary form: IRS Form 990-N
- Open Door Bird Sanctuary
EIN 900627524 · Headquarters: STURGEON BAY, WI, USA · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990
- Open Door Free Clinic Inc
EIN 352266196 · Headquarters: MILWAUKEE, WI, US · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Door Pride
EIN 825007266 · Headquarters: Sturgeon Bay, WI, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Door Rescue Mission Inc
EIN 208180595 · Headquarters: Hudson, WI, US · Housing & Shelter · Latest available filing year: 2010 · Primary form: IRS Form 990-N
- Open Door Rescue Oasis Critters Companion
EIN 203566043 · Headquarters: Abrams, WI, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Door Tae Kwon Do Inc
EIN 562369796 · Headquarters: Sturgeon Bay, WI, US · Crime & Legal Related · Latest available filing year: 2012 · Primary form: IRS Form 990-N
- Open Door Zen Community
EIN 475460639 · Headquarters: MADISON, WI, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Doors Foundation Inc
EIN 814889016 · Headquarters: MILTON, WI, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- Open Engineering Inc
EIN 831420711 · Headquarters: Menomonie, WI, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Open Hearts Open Minds Foundationinc
EIN 884263340 · Headquarters: JANESVILLE, WI, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Open Heavens Guatemala Inc
EIN 824963778 · Headquarters: EAU CLAIRE, WI, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990
- Open Notebook Inc
EIN 452234167 · Headquarters: Madison, WI, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990
- Open Sky Education Inc
EIN 205033694 · Headquarters: WAUKESHA, WI, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990
- Open Source Seed Initiative Inc
EIN 465440616 · Headquarters: MADISON, WI, USA · Food, Agriculture & Nutrition · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Open Wings Learning Community
EIN 455091063 · Headquarters: KENOSHA, WI, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990
- Open-out Professional and Executive Network- Inc
EIN 271876988 · Headquarters: MADISON, WI, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Opening More Doors Together LLC
EIN 931734836 · Headquarters: Lake Mills, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Opera for the Young Inc
EIN 391583686 · Headquarters: Madison, WI, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operating Engineers Local 139 Health Benefit Fund
EIN 237166771 · Headquarters: PEWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operating Engineers Local Post No 139
EIN 813932668 · Headquarters: PEWAUKEE, WI, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Bootstrap
EIN 391421932 · Headquarters: STEVENS POINT, WI, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operation Bring Animals Home
EIN 203667470 · Headquarters: Rubicon, WI, US · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Operation Chemo Comfort
EIN 820802671 · Headquarters: Milwaukee, WI, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2022 · Primary form: IRS Form 990-N
- Operation Chess
EIN 264557407 · Headquarters: Milwaukee, WI, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N
- Operation Christmas
EIN 301427620 · Headquarters: Luck, WI, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Dream Inc
EIN 261455938 · Headquarters: MILWAUKEE, WI, USA · Crime & Legal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ
- Operation Dream North Inc
EIN 931600823 · Headquarters: Oshkosh, WI, USA · Youth Development · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ
- Operation Fresh Start Inc
EIN 237108090 · Headquarters: MADISON, WI, USA · Employment · Latest available filing year: 2023 · Primary form: IRS Form 990
- Operation Get It There Inc
EIN 204340643 · Headquarters: Milwaukee, WI, US · Human Services · Latest available filing year: 2008 · Primary form: IRS Form 990-N
- Operation Give Hope Inc
EIN 800716406 · Headquarters: SAUKVILLE, WI, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operation Healing Heros Foundation Nfp
EIN 832374974 · Headquarters: KENOSHA, WI, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operation Help Inc
EIN 391711703 · Headquarters: HUDSON, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990
- Operation Homefront - Wisconsin Inc
EIN 202740541 · Headquarters: MADISON, WI, USA · Community Improvement & Capacity Building · Latest available filing year: 2011 · Primary form: IRS Form 990
- Operation Horses Heal Inc
EIN 872671258 · Headquarters: WESTBORO, WI, USA · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- Operation Impact-district 2 Inc
EIN 473319746 · Headquarters: MILWAUKEE, WI, US · Crime & Legal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Invisible Inc
EIN 873034396 · Headquarters: Chippewa Falls, WI, US · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Operation K9 Hero Corporation
EIN 861807160 · Headquarters: Neenah, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Mercy-USA
EIN 391746442 · Headquarters: Wales, WI, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Not Alone Inc
EIN 461833982 · Headquarters: Sturgeon Bay, WI, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Ooh-rah
EIN 263160586 · Headquarters: BELOIT, WI, US · Human Services · Latest available filing year: 2018 · Primary form: IRS Form 990-N
- Operation Outpour
EIN 461742488 · Headquarters: Pleasant Prairie, WI, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ
- Operation Santa of West Central Wisconsin Inc
EIN 873656678 · Headquarters: Chippewa Falls, WI, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-N
- Operation Sparrow Corp
EIN 823885921 · Headquarters: Nekoosa, WI, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N
- Operation Warm - Wi
EIN 834140911 · Headquarters: MILWAUKEE, WI, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N
- Operation Wwii Remembered Inc
EIN 830377222 · Headquarters: MILWAUKEE, WI, US · Arts, Culture & Humanities · Latest available filing year: 2011 · Primary form: IRS Form 990-N
- Operational K9 Medical Team of Wisconsin
EIN 852889046 · Headquarters: APPLETON, WI, USA · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-PF
- Operations and Supply Chain Consortium Inc C/o Bradley Kalscheur
EIN 814623143 · Headquarters: MILWAUKEE, WI, USA · Science & Technology · Latest available filing year: 2019 · Primary form: IRS Form 990-EZ
- Operative Plasterers & Cement Masons Labor Management Cooperatio
EIN 861135736 · Headquarters: Madison, WI, US · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990-N