Data / Nonprofits / Wisconsin / Environment
Environment nonprofits in Wisconsin: 889 registered with the IRS
889 environment nonprofits are registered with the IRS in Wisconsin, 849 of them 501(c)(3) charities; the 307 that report revenue took in $279.5 million. The most are in Madison (81), Milwaukee (49), Appleton (15). The largest by revenue: Slipstream Group Inc ($41.1 million), Revolvs Salvage Inc ($25.2 million), Whitetails Unlimited Inc ($14.3 million).
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The 500 largest by revenue
| Organization | City | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Slipstream Group Inc | Madison | 501(c)(3) | 1980 | $41.1 million | $32.1 million | 2024-12 |
| Revolvs Salvage Inc | Waupaca | 501(c)(3) | 2025 | $25.2 million | $20.1 million | 2025-12 |
| Whitetails Unlimited Inc | Sturgeon Bay | 501(c)(3) | 1986 | $14.3 million | $22.3 million | 2025-06 |
| Urban Ecology Center Inc | Milwaukee | 501(c)(3) | 1992 | $8.4 million | $41.2 million | 2025-08 |
| Kohler Trust for Clean Water | Kohler | 501(c)(3) | 2018 | $7.5 million | $288.3 million | 2026-01 |
| Northwoods Land Trust Inc | Eagle River | 501(c)(3) | 2001 | $6 million | $26.1 million | 2025-12 |
| Door County Land Trust Inc | Sturgeon Bay | 501(c)(3) | 1986 | $5.7 million | $45.7 million | 2024-12 |
| Restoring Lands Inc | West Bend | 501(c)(3) | 1993 | $5.1 million | $24.3 million | 2025-06 |
| Driftless Area Land Conservancy Inc | Dodgeville | 501(c)(3) | 2001 | $5.1 million | $13.3 million | 2025-12 |
| Clean Wisconsin Inc | Madison | 501(c)(3) | 1982 | $5 million | $6.6 million | 2025-12 |
| Friends of Schlitz-Audubon Center Inc | Milwaukee | 501(c)(3) | 1977 | $4.6 million | $8.8 million | 2025-06 |
| Green Bay Botanical Garden Inc | Green Bay | 501(c)(3) | 1984 | $4.3 million | $31.2 million | 2025-04 |
| Kohler Trust for Preservation | Kohler | 501(c)(3) | 1990 | $4 million | $9.5 million | 2026-01 |
| Kuse Farm Museum and Nature Preserve Inc | Medford | 501(c)(3) | 2021 | $4 million | $4.1 million | 2025-06 |
| Aldo Leopold Nature Center Inc | Monona | 501(c)(3) | 1994 | $3.8 million | $6.5 million | 2024-12 |
| Mississippi Valley Conservancy Inc | La Crosse | 501(c)(3) | 1997 | $3.7 million | $30.2 million | 2025-06 |
| Olbrich Botanical Society Inc | Madison | 501(c)(3) | 1980 | $3.7 million | $6 million | 2024-12 |
| Savanna Institute | Madison | 501(c)(3) | 2015 | $3.6 million | $20.1 million | 2024-12 |
| Robert W Monk Gardens Inc | Wausau | 501(c)(3) | 2004 | $3.5 million | $7.2 million | 2024-12 |
| Coalition for Sustainable Initiatives | Whitefish Bay | 501(c)(3) | 2015 | $3 million | $6,981 | 2024-09 |
| Taliesin Preservation Inc | Spring Green | 501(c)(3) | 1990 | $3 million | $5.6 million | 2024-12 |
| Wisconsin Conservation Voices Inc | Madison | 501(c)(3) | 2002 | $2.9 million | $3.1 million | 2024-12 |
| Riveredge Nature Center Inc | Newburg | 501(c)(3) | 1968 | $2.7 million | $12.1 million | 2025-06 |
| Landmark Conservancy Inc | Menomonie | 501(c)(3) | 1997 | $2.6 million | $14.8 million | 2025-06 |
| Central Conservation Inc | La Crosse | 501(c)(3) | 2010 | $2.5 million | $2.3 million | 2024-12 |
| Cedar Lakes Conservation Foundation Inc | West Bend | 501(c)(3) | 1977 | $2.4 million | $34.5 million | 2025-12 |
| Groundswell Conservancy Inc | Madison | 501(c)(3) | 1983 | $2.1 million | $10.2 million | 2025-06 |
| Cleantech Partners Inc | Madison | 501(c)(3) | 2004 | $2.1 million | $9 million | 2024-12 |
| Madison Environmental Resourcing Inc | Madison | 501(c)(3) | 1987 | $2.1 million | $0 | 2024-03 |
| Geneva Lake Conservancy Inc | Fontana | 501(c)(3) | 1982 | $2 million | $6.5 million | 2025-12 |
| Glacierland Resource Conservation & Development | Green Bay | 501(c)(3) | 1996 | $2 million | $554,109 | 2024-12 |
| Wild Rivers Conservancy of the St Croix & Namekagon | Osceola | 501(c)(3) | 2008 | $2 million | $1.3 million | 2025-12 |
| Tall Pines Conservancy Inc | Nashotah | 501(c)(3) | 2000 | $1.9 million | $4.5 million | 2024-12 |
| Green Lake Association Inc | Green Lake | 501(c)(3) | 1977 | $1.9 million | $6.5 million | 2025-12 |
| Institute for the Study of Energy and Our Future | Ellsworth | 501(c)(3) | 2009 | $1.9 million | $1.4 million | 2024-12 |
| Gathering Waters Inc | Madison | 501(c)(3) | 1995 | $1.8 million | $2.1 million | 2025-12 |
| Midwest Renewable Energy Association Inc | Custer | 501(c)(3) | 1994 | $1.7 million | $1.1 million | 2025-06 |
| Milwaukee Parks Foundation | Milwaukee | 501(c)(3) | 2020 | $1.6 million | $1.1 million | 2025-12 |
| Southern Wisconsin Bird Alliance Inc | Madison | 501(c)(3) | 1981 | $1.6 million | $24 million | 2025-12 |
| Golden Sands Resource Conservation and Development Council | Stevens Point | 501(c)(3) | 1998 | $1.5 million | $465,357 | 2024-12 |
| Woodland Dunes Nature Center and Preserve Inc | Two Rivers | 501(c)(3) | 1993 | $1.5 million | $6.6 million | 2025-12 |
| Milwaukee Water Commons Inc | Milwaukee | 501(c)(3) | 2019 | $1.5 million | $1.6 million | 2024-12 |
| Fund for Lake Michigan Inc | Milwaukee | 501(c)(3) | 2022 | $1.4 million | $801,568 | 2025-12 |
| Wisconsin Land and Water Conservation Association Inc | Madison | 501(c)(3) | 1994 | $1.4 million | $1.5 million | 2024-12 |
| Rotary Botanical Gardens Inc | Janesville | 501(c)(3) | 1994 | $1.4 million | $3.6 million | 2025-03 |
| Reflo | Milwaukee | 501(c)(3) | 2015 | $1.4 million | $1.1 million | 2024-12 |
| Renew Wisconsin Inc | Madison | 501(c)(3) | 1992 | $1.4 million | $1.8 million | 2025-06 |
| Trees for Tomorrow Inc | Eagle River | 501(c)(3) | 1945 | $1.3 million | $1.8 million | 2025-12 |
| Lumberjack Resource Conservation and Development Council | Rhinelander | 501(c)(3) | 1995 | $1.3 million | $1.1 million | 2024-12 |
| Olbrich Botanical Society Foundation Inc | Madison | 501(c)(3) | 2002 | $1.2 million | $9.6 million | 2024-12 |
| Wild Ones -- Natural Landscapers LTD | Neenah | 501(c)(3) | 1991 | $1.2 million | $2 million | 2024-12 |
| Harbor District Inc | Milwaukee | 501(c)(3) | 2015 | $1.1 million | $1.8 million | 2025-06 |
| Riverview Gardens Inc | Appleton | 501(c)(3) | 2014 | $1.1 million | $5.2 million | 2025-12 |
| Heckrodt Wetland Reserve Inc | Menasha | 501(c)(3) | 1996 | $1.1 million | $1.4 million | 2024-12 |
| Rooted Wi Inc | Madison | 501(c)(3) | 1996 | $1 million | $3.7 million | 2024-12 |
| Friends of Pheasant Branch Conservancy Inc | Middleton | 501(c)(3) | 1996 | $1 million | $1.6 million | 2024-12 |
| Milwaukee Riverkeeper | Milwaukee | 501(c)(3) | 1996 | $974,877 | $621,675 | 2025-09 |
| Sustain Dane Inc | Madison | 501(c)(3) | 2003 | $945,786 | $407,272 | 2024-12 |
| Clean Lakes Alliance Inc | Madison | 501(c)(3) | 2011 | $938,969 | $818,141 | 2024-12 |
| Wisconsin Waterfowl Association Inc | Wales | 501(c)(3) | 1985 | $933,875 | $809,746 | 2024-12 |
| Friends of Lapham Peak Unit | Delafield | 501(c)(3) | 1994 | $928,817 | $3.7 million | 2025-09 |
| Wpga Perc Inc | Poynette | 501(c)(3) | 2001 | $902,326 | $412,574 | 2024-12 |
| Mequon Nature Preserve Inc | Mequon | 501(c)(3) | 2011 | $888,997 | $2 million | 2024-12 |
| Beloit Convention & Visitors Bureau Charitable Foundation Inc | Beloit | 501(c)(3) | 1992 | $881,019 | $1.8 million | 2025-12 |
| Midwest Bikeshare Inc | Milwaukee | 501(c)(3) | 2013 | $870,629 | $1.2 million | 2024-12 |
| Future Neenah Inc | Neenah | 501(c)(3) | 1999 | $865,508 | $1.3 million | 2025-12 |
| Wisconsin Wetlands Association Inc | Madison | 501(c)(3) | 1996 | $856,095 | $1 million | 2025-06 |
| Linda and Gene Farley Center for Peace Justice and Sustainability I | Verona | 501(c)(3) | 2011 | $783,873 | $2.9 million | 2024-12 |
| Applied Ecological Institute Inc | Brodhead | 501(c)(3) | 2021 | $745,761 | $4.4 million | 2025-12 |
| North American Lake Management Society | Madison | 501(c)(3) | 1990 | $675,527 | $888,508 | 2024-12 |
| Friends of Wehr Nature Center Inc | Franklin | 501(c)(3) | 1982 | $674,833 | $708,823 | 2024-12 |
| Wings Over Wisconsin Inc | Mayville | 501(c)(3) | 1981 | $657,986 | $3.2 million | 2025-12 |
| Yahara Pride Farms Inc | Waunakee | 501(c)(3) | 2016 | $623,542 | $978,531 | 2024-12 |
| Northeast Wisconsin Land Trust Inc | Appleton | 501(c)(3) | 1996 | $618,953 | $3.9 million | 2024-12 |
| Norskedalen Nature and Heritage Center Inc | Coon Valley | 501(c)(3) | 1995 | $579,169 | $4.2 million | 2025-12 |
| Wisconsins Green Fire Incorporated | Madison | 501(c)(3) | 2018 | $578,281 | $298,359 | 2024-12 |
| Groundwork Milwaukee Inc | Milwaukee | 501(c)(3) | 2007 | $570,865 | $267,171 | 2024-12 |
| Mandaamin Institute Inc | Elkhorn | 501(c)(3) | 2011 | $559,933 | $587,994 | 2024-12 |
| Friends of Reedsburg Parks | Reedsburg | 501(c)(3) | 2024 | $554,150 | $2.3 million | 2025-12 |
| Navarino Nature Center Inc | Shiocton | 501(c)(3) | 1986 | $533,879 | $2 million | 2024-12 |
| 1000 Friends of Wisconsin Inc | Stevens Point | 501(c)(3) | 1996 | $533,442 | $344,708 | 2024-12 |
| Root-Pike Watershed Initiative Network Inc | Kenosha | 501(c)(3) | 2004 | $517,955 | $1.5 million | 2025-06 |
| Eco Justice Center Inc | Caledonia | 501(c)(3) | 2020 | $517,042 | $1.5 million | 2025-08 |
| Wisconsin Tribal Conservation Advisory Council Inc | Oconto Falls | 501(c)(3) | 2009 | $513,506 | $127,569 | 2024-12 |
| Bradley-Sigma Phi Historical Landmark Preservation Fund Inc | Madison | 501(c)(3) | 1991 | $513,002 | $527,096 | 2024-12 |
| Sustainable Business Council Corp | Eagle | 501(c)(3) | 2024 | $511,345 | $308,496 | 2025-12 |
| Healthy Climate Wisconsin | Madison | 501(c)(3) | 2020 | $510,353 | $484,415 | 2025-12 |
| Glacial Lakes Conservancy Inc | Sheboygan | 501(c)(3) | 1997 | $507,884 | $1.3 million | 2025-09 |
| Crossroads at Big Creek Inc | Sturgeon Bay | 501(c)(3) | 2003 | $502,124 | $3.3 million | 2024-12 |
| Southeastern Wisconsin Watersheds Trust Inc | Milwaukee | 501(c)(3) | 2010 | $498,776 | $317,182 | 2024-12 |
| Northwoods Wildlife Hospital and Rehabilitation Center Inc | Minocqua | 501(c)(3) | 1979 | $485,641 | $345,964 | 2025-06 |
| Forest Home Historic Preservation Association Inc | Milwaukee | 501(c)(3) | 1986 | $483,947 | $1.2 million | 2024-12 |
| Friends of Devils Lake State Park | Baraboo | 501(c)(3) | 1997 | $479,447 | $1.9 million | 2025-10 |
| River Alliance of Wisconsin Inc | Madison | 501(c)(3) | 1994 | $477,469 | $1.2 million | 2025-09 |
| Mississippi River Parkway Commission | Madison | 501(c)(3) | 1979 | $475,322 | $902,881 | 2024-12 |
| Philadelphia Community Farm Inc | Osceola | 501(c)(3) | 1992 | $466,665 | $1.2 million | 2025-12 |
| Southern Wisconsin Land Conservancy Inc | Brodhead | 501(c)(3) | 2019 | $464,666 | $2.7 million | 2024-12 |
| North Central Conservancy Trust Inc | Stevens Point | 501(c)(3) | 1996 | $461,357 | $2.1 million | 2025-12 |
| River Bend Nature Center Inc | Caledonia | 501(c)(3) | 2012 | $446,122 | $2.6 million | 2024-12 |
| Kinnickinnic River Land Trust Inc | River Falls | 501(c)(3) | 1994 | $445,399 | $2.1 million | 2024-12 |
| Prairie Enthusiasts Trust | Viroqua | 501(c)(3) | 2009 | $440,285 | $3.3 million | 2025-03 |
| Wisconsin Wastewater Operators Association | Wales | 501(c)(3) | 1990 | $439,362 | $310,209 | 2025-12 |
| Ursa Collective Incorporated | Madison | 501(c)(3) | 2025 | $414,739 | $758,661 | 2025-12 |
| 350 Wisconsin Inc | Madison | 501(c)(3) | 2016 | $410,413 | $102,257 | 2025-06 |
| Friends of Willow River and Kinnickinnic State Parks Inc | Hudson | 501(c)(3) | 1995 | $409,022 | $1.2 million | 2024-12 |
| Friends of Crex Inc | Grantsburg | 501(c)(3) | 1986 | $407,596 | $3.1 million | 2024-12 |
| Victory Garden Initiative Inc | Milwaukee | 501(c)(3) | 2013 | $406,023 | $491,709 | 2025-12 |
| Bus for Outdoor Access and Teaching | Milwaukee | 501(c)(3) | 2018 | $374,506 | $151,244 | 2025-11 |
| Green Lake Conservancy Inc | Green Lake | 501(c)(3) | 1995 | $371,920 | $1.8 million | 2025-12 |
| Seno K RLT Conservancy Inc | Burlington | 501(c)(3) | 1996 | $369,363 | $2 million | 2024-12 |
| Friends of High Cliff State Park Inc | Sherwood | 501(c)(3) | 1997 | $357,267 | $326,243 | 2025-12 |
| Citizens for A Better Wisconsin Inc | Milwaukee | 501(c)(4) | 2010 | $355,000 | $50,104 | 2025-12 |
| International Energy Program Evaluation Conference | Madison | 501(c)(3) | 2009 | $348,615 | $208,041 | 2025-12 |
| Friends of San Damiano Inc | Monona | 501(c)(3) | 2021 | $337,155 | $345,996 | 2024-12 |
| Sawyer County Snowmobile Alliance Inc | Hayward | 501(c)(3) | 2024 | $335,096 | $815,807 | 2025-06 |
| National Association of State Conservation Agencies | Stevens Point | 501(c)(3) | 1997 | $326,288 | $1.8 million | 2024-12 |
| Wastecap Resource Solutions Inc | Milwaukee | 501(c)(3) | 1998 | $318,727 | $260,987 | 2024-12 |
| Spider Chain of Lakes Improvement Association | Hayward | 501(c)(3) | 2006 | $318,322 | $2 million | 2025-12 |
| Friends of the Welty Environmental Center Inc | Beloit | 501(c)(3) | 1999 | $315,094 | $981,553 | 2024-12 |
| Southeastern Wisconsin Invasive Species Consortium Inc | Milwaukee | 501(c)(3) | 2010 | $311,076 | $85,055 | 2025-12 |
| Valley Stewardship Network Inc | Viroqua | 501(c)(3) | 2001 | $303,104 | $453,378 | 2025-06 |
| 350 Wisconsin Action Inc | Madison | 501(c)(4) | 2023 | $300,666 | $154,815 | 2024-12 |
| Wisconsin Woodland Owners Association Incorporated | Stevens Point | 501(c)(3) | 1980 | $297,492 | $628,959 | 2025-06 |
| Berlin Conservation Club Inc | Berlin | 501(c)(7) | 2008 | $295,096 | $768,428 | 2025-12 |
| Wisconsin Wildlife Federation Inc | Poynette | 501(c)(3) | 1975 | $286,173 | $817,390 | 2024-12 |
| Waukesha County Land Conservancy Inc | Brookfield | 501(c)(3) | 1992 | $279,312 | $14 million | 2025-12 |
| Recycling Connections Corporation | Stevens Point | 501(c)(3) | 1983 | $275,476 | $156,805 | 2025-12 |
| Friends of Schmeeckle Reserve Inc | Stevens Point | 501(c)(3) | 2015 | $272,990 | $510,610 | 2025-12 |
| Big Doctor Lake Assoc Inc | Siren | 501(c)(3) | 2022 | $267,558 | $31,319 | 2025-12 |
| Shawano Lake Property Owners Assoc | Shawano | 501(c)(3) | 1999 | $263,781 | $792,799 | 2024-12 |
| Lake Owen Association Inc | Cable | 501(c)(3) | 2003 | $259,290 | $1.6 million | 2024-12 |
| Friends of Kishwauketoe LTD | Williams Bay | 501(c)(3) | 1992 | $258,179 | $340,162 | 2024-12 |
| Teens Take On Climate Inc | Waukesha | 501(c)(3) | 2022 | $253,820 | $11,022 | 2024-12 |
| Freshair Collective | Milwaukee | 501(c)(3) | 2023 | $249,706 | $94,219 | 2025-12 |
| Deer Lake Conservancy Incorporated | St Croix FLS | 501(c)(3) | 1995 | $245,669 | $2.4 million | 2024-12 |
| Wisconsin Clean Cities-Southeast- Area Inc | Milwaukee | 501(c)(3) | 1996 | $240,945 | $109,129 | 2025-12 |
| Milwaukee Audubon Society Inc | S Milwaukee | 501(c)(3) | 1976 | $236,492 | $1.6 million | 2025-06 |
| Wisconsin Bear Hunters Association Inc | Berlin | 501(c)(4) | 1999 | $232,836 | $678,780 | 2025-12 |
| Riverwood Nature Center | Star Prairie | 501(c)(3) | 2020 | $223,054 | $2.1 million | 2024-12 |
| Federation of Environment Technologists Inc | Waukesha | 501(c)(3) | 1984 | $222,290 | $208,758 | 2025-06 |
| Court Oreilles Lakes Association Inc | Hayward | 501(c)(3) | 2020 | $218,866 | $217,867 | 2025-12 |
| Garden Club of Greater Milwaukee | Mukwonago | 501(c)(3) | 2022 | $217,858 | $163,129 | 2025-08 |
| Des Plaines Wetlands Conservancy Inc | Pleasant PR | 501(c)(3) | 1984 | $217,773 | $21.2 million | 2025-09 |
| Fair Rates for Wisconsin Dairyland Inc | Milwaukee | 501(c)(4) | 2016 | $216,271 | $50,756 | 2025-05 |
| Wisconsin Association of Lakes Inc | Sun Prairie | 501(c)(3) | 1998 | $215,495 | $224,839 | 2024-12 |
| Durwards Glen Olrg LTD | Baraboo | 501(c)(3) | 2012 | $214,273 | $486,677 | 2025-12 |
| Lake Geneva Garden Club Foundation Inc | Lake Geneva | 501(c)(3) | 1966 | $208,977 | $190,997 | 2025-12 |
| Waterways Association of Menominee and Shawano Counties Inc | Shawano | 501(c)(3) | 2016 | $204,619 | $68,402 | 2024-12 |
| Baird Creek Preservation Foundation Inc | Green Bay | 501(c)(3) | 2000 | $192,608 | $1.9 million | 2025-12 |
| Further Along Inc | Viroqua | 501(c)(3) | 2019 | $190,185 | $285,732 | 2025-12 |
| Shadows On the Wolf Inc | Shiocton | 501(c)(3) | 1993 | $189,830 | $445,844 | 2025-12 |
| Friends of Lake Henry Inc | Blair | 501(c)(3) | 2023 | $187,752 | $331,266 | 2024-12 |
| Wisconsin Local Government Climate Coalition Inc | Madison | 501(c)(3) | 2024 | $186,815 | $383,230 | 2024-12 |
| Van Der Brohe Arboretum Inc | Two Rivers | 501(c)(3) | 2019 | $183,860 | $939,114 | 2024-12 |
| Friends of Lac Lawrann Conservancy Inc | West Bend | 501(c)(3) | 1996 | $176,864 | $356,997 | 2025-10 |
| Crawford Stewardship Project LTD | Gays Mills | 501(c)(3) | 2009 | $175,189 | $187,381 | 2025-12 |
| Associated Recyclers of Wisconsin Inc | Stevens Point | 501(c)(3) | 1993 | $173,260 | $121,214 | 2025-12 |
| Friends of Fred Smith Inc | Phillips | 501(c)(3) | 1995 | $171,556 | $550,550 | 2025-12 |
| Round Lake Property Owners Association Inc | Hayward | 501(c)(3) | 2005 | $165,033 | $163,052 | 2024-12 |
| Upper Sugar River Watershed Association | Mount Horeb | 501(c)(3) | 2001 | $164,562 | $68,799 | 2024-12 |
| Rock River Coalition Inc | Jefferson | 501(c)(3) | 1997 | $164,073 | $53,421 | 2024-12 |
| Dodge County Farmers HSHW Inc | Columbus | 501(c)(3) | 2022 | $160,782 | $29,190 | 2025-12 |
| Friends of the Florence Wild Rivers Interpretive Center Inc | Florence | 501(c)(3) | 2024 | $158,209 | $67,912 | 2025-12 |
| North American Stormwater and Erosion Control Association of Wis | Madison | 501(c)(3) | 2016 | $154,565 | $72,794 | 2025-12 |
| Keep Greater Milwaukee Beautiful Inc | Milwaukee | 501(c)(3) | 1984 | $150,920 | $65,603 | 2025-12 |
| Monarch Butterfly Fund | Madison | 501(c)(3) | 1998 | $149,934 | $111,371 | 2025-12 |
| Outdoors Forever Inc | Mauston | 501(c)(3) | 2024 | $149,891 | $347,659 | 2024-12 |
| Manitowish Waters Lakes Association Inc | Manitowsh WTR | 501(c)(3) | 2013 | $144,512 | $607,234 | 2025-05 |
| Forest Exploration Center Inc | Wauwatosa | 501(c)(3) | 2009 | $142,702 | $261,386 | 2025-06 |
| Friends of the Broughton Sheboygan Marsh | Elkhart Lake | 501(c)(3) | 2008 | $142,136 | $409,930 | 2025-12 |
| Grafton Parks Society Inc | Grafton | 501(c)(3) | 2022 | $141,538 | $7,678 | 2024-12 |
| Geneva Lake Association Inc | Lake Geneva | 501(c)(3) | 1997 | $139,083 | $199,499 | 2025-06 |
| Izaak Walton League of America Inc | Beloit | 501(c)(3) | 1972 | $136,727 | $96,639 | 2025-12 |
| Standing Cedars Community Land Conservancy Inc | Osceola | 501(c)(3) | 1994 | $136,641 | $3.6 million | 2025-12 |
| Three Lakes Waterfront Association Inc | Three Lakes | 501(c)(3) | 2000 | $135,517 | $181,728 | 2025-12 |
| Mondovi Conservation Club Inc | Mondovi | 501(c)(3) | 1997 | $134,967 | $426,965 | 2025-12 |
| Lake Eau Galle Association Inc | Eau Galle | 501(c)(3) | 2022 | $134,240 | $327,251 | 2025-12 |
| Pelican Lake Association Inc | Pelican Lake | 501(c)(3) | 2010 | $133,857 | $133,474 | 2025-12 |
| Friess Lake Advancement Association | Hubertus | 501(c)(3) | 2022 | $132,687 | $159,710 | 2025-12 |
| Nearby Nature Milwaukee | Milwaukee | 501(c)(3) | 2023 | $130,461 | $216,788 | 2025-12 |
| American Peony Society | Chilton | 501(c)(3) | 2023 | $127,889 | $305,692 | 2026-06 |
| Cataract Sportsmens Club Inc | Cataract | 501(c)(3) | 1996 | $127,680 | $260,224 | 2025-11 |
| Urban Tree Alliance | Madison | 501(c)(3) | 2012 | $127,455 | $21,340 | 2025-12 |
| River Revitalizational Foundation Inc | Milwaukee | 501(c)(3) | 1997 | $126,935 | $0 | 2024-12 |
| Wisconsin Conservation and Education Foundation Inc | Madison | 501(c)(3) | 1998 | $126,913 | $373,893 | 2025-12 |
| Boerner Gardens Endowment Inc | Hales Corners | 501(c)(3) | 2005 | $121,952 | $1.1 million | 2025-07 |
| Community Conservation Inc | Viroqua | 501(c)(3) | 1994 | $121,755 | $207,916 | 2025-06 |
| International Union of Soil Sciences Inc | Madison | 501(c)(3) | 2014 | $118,811 | $1 million | 2024-12 |
| Dusty Trails Atv Club Inc | Mountain | 501(c)(3) | 2024 | $117,444 | $212,868 | 2025-12 |
| Friends of Kickapoo Valley Reserve Inc | La Farge | 501(c)(3) | 2003 | $117,418 | $153,580 | 2024-12 |
| Dairymens Foundation Inc | Boulder JCT | 501(c)(3) | 2011 | $115,185 | $582,239 | 2025-04 |
| Namakagon Lake Association Inc | Cable | 501(c)(3) | 2016 | $113,516 | $88,466 | 2025-12 |
| Madeline Island Wilderness Preserve | La Pointe | 501(c)(3) | 1988 | $113,095 | $2.3 million | 2024-12 |
| Pringle Nature Center | Bristol | 501(c)(3) | 2012 | $111,109 | $75,092 | 2025-06 |
| Coon Creek Community Watershed Council Inc | Coon Valley | 501(c)(3) | 2022 | $110,369 | $107,092 | 2024-12 |
| Environmental Sustainability Rotarian Action Group Inc | Madison | 501(c)(3) | 2016 | $109,986 | $168,960 | 2025-06 |
| Forest Lake Preservation Foundation Inc | Land O Lakes | 501(c)(3) | 2019 | $105,908 | $177,781 | 2025-12 |
| River Valley Trails Inc | Hudson | 501(c)(3) | 2003 | $100,263 | $56,568 | 2025-12 |
| Wisconsin Association for Environmental Education Inc | Milwaukee | 501(c)(3) | 1982 | $99,775 | $114,610 | 2024-12 |
| Peninsula Pride Farms Inc | Luxemburg | 501(c)(3) | 2016 | $99,514 | $207,538 | 2025-12 |
| Coalition To Save the Menominee River Inc | Marinette | 501(c)(3) | 2017 | $99,008 | $227,137 | 2023-12 |
| Friends of the Cedarburg Bog Inc | Saukville | 501(c)(3) | 2006 | $98,902 | $407,123 | 2025-09 |
| Eagle River Chain of Lakes Association | Eagle River | 501(c)(3) | 2014 | $97,843 | $630,163 | 2025-12 |
| Kettle Moraine Land Trust | Elkhorn | 501(c)(3) | 2001 | $97,080 | $1 million | 2024-12 |
| Friends of Dutch Hollow Lake Inc | La Valle | 501(c)(3) | 2020 | $96,729 | $59,791 | 2025-12 |
| Friends of Ledgeview Nature Center | Chilton | 501(c)(3) | 1984 | $96,007 | $89,473 | 2024-12 |
| Whitetails Unlimited Inc | Altoona | 501(c)(3) | 1986 | $95,402 | $58,574 | 2025-06 |
| Long Lake Preservation Association | Birchwood | 501(c)(3) | 1995 | $94,545 | $127,531 | 2024-12 |
| Forest Co Atv Association | Laona | 501(c)(3) | 2025 | $93,024 | $147,416 | 2025-12 |
| Friends of Mirror Lake State Park | Baraboo | 501(c)(3) | 2002 | $92,467 | $159,931 | 2025-12 |
| Marsh Haven Nature Center Inc | Waupun | 501(c)(3) | 1985 | $91,639 | $814,120 | 2024-12 |
| Whitefish Lake Conservation Organization Inc | Gordon | 501(c)(3) | 2001 | $91,626 | $164,337 | 2025-12 |
| Near North Trail Riders of Athelstane Inc | Athelstane | 501(c)(4) | 1999 | $88,103 | $229,821 | 2026-06 |
| Friends of Horicon International Education Center Inc | Horicon | 501(c)(3) | 1995 | $87,303 | $447,020 | 2025-12 |
| Friends of Governor Dodge State Park | Dodgeville | 501(c)(3) | 1998 | $87,023 | $136,461 | 2024-12 |
| Big Sissabagama Lake Shoreowners Association Incorporated | Stone Lake | 501(c)(3) | 2023 | $84,755 | $19,322 | 2025-12 |
| Tomorrow River Valley Conservation Club Inc | Amherst | 501(c)(3) | 2019 | $84,488 | $293,313 | 2025-12 |
| Beaver Dam Lake Improvement Association Inc | Beaver Dam | 501(c)(3) | 2003 | $83,311 | $366,371 | 2025-12 |
| River Country Resource Conservation and Development RC & D Council Inc | Eau Claire | 501(c)(3) | 1987 | $82,968 | $88,888 | 2025-12 |
| Flambeau Area Trail Tenders | Holcombe | 501(c)(7) | 2014 | $82,657 | $217,178 | 2025-12 |
| Friends of the Arboretum | Madison | 501(c)(3) | 1989 | $82,297 | $148,112 | 2025-06 |
| Regeneration Equity and Justice Inc | Ashland | 501(c)(3) | 2021 | $81,541 | $9,077 | 2025-12 |
| Maiden Lakes Association Inc | Lakewood | 501(c)(3) | 2022 | $81,074 | $93,371 | 2024-12 |
| Lakes & Pines Sno-Trails Inc | Spooner | 501(c)(7) | 1999 | $79,912 | $221,087 | 2025-06 |
| Lake Metonga Association Inc | Crandon | 501(c)(3) | 1999 | $78,327 | $286,229 | 2025-12 |
| Fox Lake Preservation Organization Inc | Fox Lake | 501(c)(3) | 2018 | $76,407 | $140,799 | 2026-05 |
| Iron River Pike Chain of Lakes Association Inc | Iron River | 501(c)(3) | 2010 | $74,465 | $348,181 | 2025-12 |
| Green-Rock Audubon Society Inc | Janesville | 501(c)(3) | 1992 | $72,486 | $1.1 million | 2025-08 |
| Friends of Governor Nelson State Park | Waunakee | 501(c)(3) | 2024 | $71,958 | $55,309 | 2025-12 |
| Lafayette Ag Stewardship Alliance | South Wayne | 501(c)(3) | 2017 | $71,795 | $31,458 | 2024-12 |
| Star Prairie Land Preservation Trust Inc | Star Prairie | 501(c)(3) | 2003 | $70,781 | $713,349 | 2025-12 |
| Westfork Sportsman Club Inc | Viroqua | 501(c)(3) | 2020 | $70,544 | $148,036 | 2024-12 |
| Pishtaka Wildlife Foundation Inc | Burlington | 501(c)(3) | 2016 | $70,442 | $51,211 | 2024-12 |
| North and South Twin Lakes Riparian Association Inc | Phelps | 501(c)(3) | 2002 | $70,431 | $23,816 | 2025-06 |
| Spread Eagle Chain of Lakes Inc | Florence | 501(c)(3) | 2003 | $69,917 | $218,530 | 2025-12 |
| Green Tree Garden Club Inc | Mequon | 501(c)(3) | 2001 | $69,820 | $211,907 | 2026-06 |
| Fox Cities Greenways Inc | Menasha | 501(c)(3) | 1995 | $68,247 | $196,018 | 2025-12 |
| Oakfield Conservation Club Inc | Oakfield | 501(c)(4) | 1959 | $68,147 | $661,057 | 2025-12 |
| Lake Poygans Sportsmans Club | Larsen | 501(c)(3) | 1997 | $67,802 | $499,432 | 2024-12 |
| Roots and Branches Inc | West Bend | 501(c)(3) | 1990 | $67,750 | $67,553 | 2025-12 |
| Friends of Pike Lake Inc | Hartford | 501(c)(3) | 2013 | $67,744 | $186,106 | 2025-07 |
| Wheeler Lake Association | Lakewood | 501(c)(3) | 2009 | $64,818 | $186,953 | 2025-12 |
| Friends of Beaver Lake Inc | Hartland | 501(c)(3) | 2006 | $62,979 | $380,876 | 2025-08 |
| Silver Lake Preservation Association Inc | Laona | 501(c)(3) | 2015 | $62,938 | $160,011 | 2025-12 |
| Kettle Moraine Garden Club Inc | Nashotah | 501(c)(3) | 1960 | $62,792 | $153,999 | 2025-12 |
| Friends of Lake Kegonsa Society Inc | Stoughton | 501(c)(3) | 2016 | $61,545 | $230,569 | 2025-12 |
| Friends of the Evjue School Forest of Merrill Inc | Merrill | 501(c)(3) | 2004 | $61,338 | $270,872 | 2025-07 |
| International Association of Meteorology and Atmospheric Scienc | Madison | 501(c)(3) | 2022 | $60,423 | $385,452 | 2025-12 |
| Prosperity Wisconsin Inc | Janesville | 501(c)(4) | 2025 | $60,103 | $49,904 | 2025-12 |
| Foxhead Regenerative Agriculture Project | Green Lake | 501(c)(3) | 2022 | $60,045 | $18,419 | 2024-12 |
| Teal Lost Land and Ghost Lakes Improvement Association Inc | Hayward | 501(c)(3) | 1995 | $59,192 | $191,984 | 2026-05 |
| Apostle Islands Historic Preservation Conservancy | Bayfield | 501(c)(3) | 2008 | $58,851 | $1.2 million | 2025-12 |
| Deer Creek Sport & Conservation Club | Verona | 501(c)(3) | 2003 | $58,383 | $280,829 | 2026-03 |
| Southeast Wisconsin Land Conservancy | Oconomowoc | 501(c)(3) | 2021 | $58,008 | $766,922 | 2025-12 |
| Platteville Community Arboretum Inc | Platteville | 501(c)(3) | 2005 | $58,003 | $236,333 | 2025-12 |
| Uec Supporting Organization Inc | Milwaukee | 501(c)(3) | 2024 | $55,840 | $5.6 million | 2025-08 |
| Forward Emdowment Trust | Green Bay | 501(c)(3) | 1997 | $55,129 | $754,644 | 2025-12 |
| Koenigs Conservation Association | Sheboygan FLS | 501(c)(3) | 2015 | $53,221 | $363,060 | 2025-12 |
| Watershed Program of Southeast Wisconsin Inc | Racine | 501(c)(3) | 2020 | $52,594 | $12,312 | 2025-06 |
| Sauk Prairie Conservation Alliance Inc | Baraboo | 501(c)(3) | 2002 | $51,538 | $137,868 | 2025-12 |
| Durand Sportsmans Club | Durand | 501(c)(3) | 2013 | $50,153 | $63,911 | 2026-06 |
| Art & Nature Center | Washington Is | 501(c)(3) | 1988 | $49,260 | $154,944 | 2025-12 |
| Whitetails Unlimited Inc | Marshfield | 501(c)(3) | 1986 | $48,705 | $36,125 | 2024-06 |
| Belmont Sportsmens Club Inc | Belmont | 501(c)(3) | 2014 | $46,509 | $1 million | 2025-08 |
| Cambria Conservation Club | Randolph | 501(c)(3) | 2017 | $45,742 | $101,640 | 2024-12 |
| Butte Des Morts Conservation Club Inc | Bte Des Morts | 501(c)(3) | 1995 | $44,158 | $1 million | 2024-12 |
| Waukesha County Green Team Inc | Waukesha | 501(c)(3) | 2014 | $43,595 | $32,513 | 2025-12 |
| Alpha Pi Alliance for the Preserva Tion of Historic Places Inc | Verona | 501(c)(3) | 1990 | $42,800 | $15,781 | 2025-12 |
| Lac Vieux Desert Lake Association Inc | Land O Lakes | 501(c)(3) | 2021 | $41,939 | $69,585 | 2026-01 |
| Delava N Lake Improvement Association | Delavan | 501(c)(3) | 2017 | $40,584 | $56,975 | 2024-12 |
| Fort Atkinson Wisconservation Club Inc | Fort Atkinson | 501(c)(3) | 1997 | $39,459 | $83,502 | 2025-03 |
| Clean Water Action Council of Northeast Wisconsin Inc | Green Bay | 501(c)(3) | 1987 | $39,427 | $68,198 | 2024-12 |
| Yellow Lakes and River Assoc Inc | Webster | 501(c)(3) | 2014 | $39,148 | $98,274 | 2025-12 |
| Lakes at Stake Wisconsin Inc | Cedarburg | 501(c)(4) | 2024 | $36,680 | $8,147 | 2025-12 |
| Red Cedar Lakes Association Inc | Birchwood | 501(c)(3) | 1996 | $35,438 | $132,790 | 2025-12 |
| Clover Leaf Lakes Protective Association Inc | Embarrass | 501(c)(3) | 2013 | $32,177 | $285,029 | 2025-12 |
| Community Improvement of Algoma LTD | Algoma | 501(c)(3) | 1994 | $31,511 | $66,327 | 2025-08 |
| Friends of the North Pikes Creek Wetlands | Bayfield | 501(c)(3) | 2014 | $30,994 | $212,491 | 2025-12 |
| White Lake Preservation Association LTD | Weyauwega | 501(c)(3) | 2017 | $29,172 | $51,716 | 2025-12 |
| Buffalo County Land & Trails Trust Inc | Alma | 501(c)(3) | 2015 | $24,189 | $282,061 | 2025-12 |
| Stockbridge Harbor Fishing Club Inc | Stockbridge | 501(c)(3) | 2026 | $23,737 | $88,417 | 2025-11 |
| Lower Sugar River Watershed Association Inc | Brodhead | 501(c)(3) | 2013 | $22,511 | $18,644 | 2024-12 |
| Crystal Lake Assoc Inc | Oconomowoc | 501(c)(3) | 2023 | $21,620 | $13,331 | 2025-12 |
| Crawling Stone Lakes Association | Lac Du Flambu | 501(c)(3) | 2015 | $20,392 | $35,950 | 2024-12 |
| Whitetails Unlimited Inc | Stratford | 501(c)(3) | 1986 | $19,532 | $29,604 | 2025-06 |
| Friends of Harrington Beach State Park Inc | Belgium | 501(c)(3) | 2020 | $18,714 | $64,995 | 2024-12 |
| Wolf Run Association Incorporated | Mazomanie | 501(c)(3) | 2012 | $18,296 | $25,107 | 2024-12 |
| Friends of Pattison and Amnicon Falls State Parks Inc | Superior | 501(c)(3) | 2016 | $18,205 | $95,973 | 2024-12 |
| Ozaukee Master Gardeners | Grafton | 501(c)(3) | 2003 | $17,548 | $83,913 | 2025-12 |
| Chippewa County Land Conservancy Inc | Chippewa FLS | 501(c)(3) | 2001 | $15,594 | $2.5 million | 2025-12 |
| Walleye Restoration Foundation Inc | Star Lake | 501(c)(3) | 2024 | $14,338 | $7,714 | 2025-12 |
| Uec Land Corporation | Milwaukee | 501(c)(3) | 2014 | $13,750 | $2.5 million | 2025-08 |
| Wild Path Collective Incorporated | Osceola | 501(c)(3) | 2022 | $10,514 | $827,334 | 2024-12 |
| Friends of the Bird Sanctuary Inc | Gordon | 501(c)(3) | 2026 | $9,261 | $86,326 | 2025-06 |
| Wisconsin Metro Audubon Society Inc | Franklin | 501(c)(3) | 1982 | $7,414 | $22,160 | 2026-04 |
| Winnebago Conservation Club Inc | Oshkosh | 501(c)(3) | 2014 | $6,877 | $6,598 | 2024-12 |
| Innov8tec Inc | Siren | 501(c)(3) | 2023 | $6,821 | $9,639 | 2025-12 |
| Fay Lake Association Inc | Sheboygan | 501(c)(3) | 2025 | $6,046 | $10,118 | 2025-12 |
| Plymouth Mill Pond Lake Association Inc | Plymouth | 501(c)(3) | 2012 | $5,368 | $17,956 | 2024-12 |
| Hidden Lake Conservancy Inc | Brookfield | 501(c)(3) | 2017 | $4,000 | $432,552 | 2025-12 |
| Popple Lake Association Inc | Chippewa FLS | 501(c)(3) | 2025 | $2,890 | $1 | 2025-12 |
| New Organic Solutions Inc | Appleton | 501(c)(3) | 2024 | $2,540 | $2.2 million | 2024-12 |
| Midwest Houndsmen | Boyceville | 501(c)(3) | 2025 | $2,329 | $591 | 2025-12 |
| Friends of Sylvania | Madison | 501(c)(3) | 2010 | $2,229 | $419,914 | 2025-12 |
| Star Lakes-Little Star Lakesassociation Inc | Menomonee FLS | 501(c)(3) | 2012 | $1,275 | $2,404 | 2025-12 |
| International Symposium On Fireworks Society LTD | Whitefish Bay | 501(c)(6) | 2022 | $1,004 | $280,104 | 2024-12 |
| Wisconsin Land Conservationfoundation Inc | Hartford | 501(c)(3) | 2007 | $300 | $815,541 | 2025-12 |
| 14 Mile Watershed Alliance - Corporation | Nekoosa | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| 7 Hour Plane Crash Foundation | Waukesha | 501(c)(3) | 2025 | $18,000 | 2025-12 | |
| Academy of Evangelical Scientists and Ethicists Inc | Oregon | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Adams County Lake Alliance | Oxford | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Alliance for Water Stewardship North America Inc | Milwaukee | 501(c)(3) | 2011 | $0 | $0 | 2024-12 |
| Alma Center Improvement Club | Alma Center | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Almond Rod & Gun Club Inc | Almond | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Ancient Earthworks Society of Wisconsin Inc | Madison | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Anderson Park Friends | Oregon | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Antigo Garden Club | Deerbrook | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Arboreus Inc | Sheboygan | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Areca Sol Corporation | Hartford | 501(c)(3) | 2026 | |||
| Armstrong Creek Sportmens Club Inc | Armstrong CRK | 501(c)(3) | 2026 | |||
| BT Farms Foundation Inc | Madison | 501(c)(3) | 2022 | $0 | $161,973 | 2024-12 |
| Badgerland Foundation Inc | Monroe | 501(c)(3) | 2023 | $8 million | 2025-08 | |
| Ballard-Irving-White Birch Lakes Association | Star Lake | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Balsam Branch Partnership Inc | Amery | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Barron County Master Gardeners | Rice Lake | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Bass Lake-Town of Casey-Shore Owners Association | Spooner | 501(c)(3) | 2018 | $2,679 | 2025-12 | |
| Bay Area Daylily Buds Inc | Wausaukee | 501(c)(3) | 2004 | $0 | $0 | 2024-12 |
| Bear Crossing Outdoors Inc | Medford | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Bear Lake Preservation Association Foundation LTD | Manawa | 501(c)(3) | 2026 | |||
| Berry Lake Property Owners Association | Neenah | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Betty A Lewis Environmental Charitable Trust | Appleton | 501(c)(3) | 2010 | $2.8 million | 2025-12 | |
| Bielinski Conservation Community Land Foundation Inc | Pewaukee | 501(c)(3) | 2003 | $31,700 | 2025-12 | |
| Big Arbor Vitae Lake Association | Arbor Vitae | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Big Bass Lake Owners Association | Eagle River | 501(c)(3) | 2024 | |||
| Big Bearskin Lake Association | Harshaw | 501(c)(3) | 2025 | $0 | $0 | 2025-09 |
| Big Eau Pleine Citizens Organization Inc | Mosinee | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Big Portage Lake Riparian Owners Association Incorporated | Land O Lakes | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Big Sand Lake Association Inc | Siren | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Bio Sirens the Biodiversity Coaltio N of the Americas Inc | Milwaukee | 501(c)(3) | 2026 | |||
| Bioverse Inc | La Crosse | 501(c)(3) | 2025 | |||
| Black Earth Creek Foundation Inc | Cross Plains | 501(c)(3) | 1997 | $0 | $0 | 2025-06 |
| Black Earth Creek Watershed Association Inc | Cross Plains | 501(c)(3) | 1996 | $0 | $0 | 2024-12 |
| Black Oak Lake Preservation Foundation Inc | Land O Lakes | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Black Point Historic Preserve Inc | Lake Geneva | 501(c)(3) | 1998 | $0 | $0 | 2024-12 |
| Black River Advancement Association Inc | Sheboygan | 501(c)(3) | 2015 | $0 | $0 | 2024-12 |
| Blair Street Gardens Committee Inc | Madison | 501(c)(3) | 1985 | $0 | $0 | 2026-02 |
| Blockhouse Lake Association Inc | Park Falls | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Blue Hills Trail Association Inc | Bruce | 501(c)(3) | 2006 | $0 | $0 | 2026-08 |
| Blue Mounds Project Inc | Mount Horeb | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Boulder Lake Advancement Assoc | Boulder JCT | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Brice Prairie Conservation Association Inc | Onalaska | 501(c)(3) | 2008 | $0 | $0 | 2026-03 |
| Brule River Sportsmens Club Inc | Brule | 501(c)(3) | 2000 | $0 | $0 | 2024-12 |
| Buckthorn Project Inc | Wauwatosa | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Burlington Area Garden Club Inc | Burlington | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Burnett County Lakes and Rivers Association Inc | Siren | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Calumet County Ag Stewardship Alliance | Chilton | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Calumet County Citizens Forresponsible Energy Inc | Chilton | 501(c)(4) | 2007 | $0 | $0 | 2025-12 |
| Cambridge Farm To School Inc | Cambridge | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Cambridge Tree Project | Cambridge | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Camp10 Gardens Inc | Lena | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Capitol Water Trails LTD | Madison | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Carolyn A Victor Land Conservancy Inc | Fond Du Lac | 501(c)(3) | 2016 | $123,789 | 2025-12 | |
| Carpenter Lake Association Inc | Eagle River | 501(c)(3) | 1996 | $0 | $0 | 2023-12 |
| Carter Can Collect Community Initia Tive | Milwaukee | 501(c)(3) | 2026 | |||
| Cedar Creek Watchdogs Limited | Cedarburg | 501(c)(3) | 2026 | |||
| Cedarburg Junior Womans Club Inc | Cedarburg | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Central Region Garden Clubs | Sun Prairie | 501(c)(3) | 2016 | $0 | $0 | 2025-05 |
| Central Sands Land Foundation Inc | Nekoosa | 501(c)(3) | 2022 | $1 | 2024-12 | |
| Central Wisconsin Recreation & Wildlife | Medford | 501(c)(4) | 2021 | $0 | $0 | 2026-02 |
| Chequamegon Bay Renewables Inc | Bayfield | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Chicog Community Lakes Committee | Minong | 501(c)(3) | 2025 | $0 | $0 | 2024-12 |
| Children of the Earth United Inc | Fitchburg | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Chippewa Valley Master Gardener Association | Chippewa Falls | 501(c)(3) | 2014 | $0 | $0 | 2024-12 |
| Citizens for A Scenic Wisconsin | Maple Bluff | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Citizens for Safe Water Around Badger | Merrimac | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Clam Falls Flowage Lake Association | Frederic | 501(c)(3) | 2020 | $0 | $0 | 2026-06 |
| Clam Lake Forest Riders | Clam Lake | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Clarks Lake Advancement Association Inc | Sturgeon Bay | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Clean Green Action | Wisc Rapids | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Clean Water Association Inc | Pewaukee | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Clean World Benefits Inc | Madison | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Clear Lake Improvement Association | Milton | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Climate Action Mapping Project Inc | Madison | 501(c)(3) | 2026 | |||
| Climate Alliance for the Common Good | La Crosse | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Climate Jobs Wisconsin | Milwaukee | 501(c)(3) | 2026 | |||
| Climate Jobs Wisconsin Action Fund Inc | Milwaukee | 501(c)(4) | 2026 | $0 | $1 | 2025-12 |
| Cole Lead Safe and Healthy Homes Project Inc | Milwaukee | 501(c)(3) | 2024 | $0 | $0 | 2023-12 |
| Comforter Ministry Incorporated | Wisc Rapids | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Committee To Preserve Lot 3 Sunnysi de Inc | Stoughton | 501(c)(3) | 2026 | |||
| Community Conservation Legacy Fund Inc | Viroqua | 501(c)(3) | 2019 | $0 | $1,292 | 2025-10 |
| Community First for Long Lake Township | Sarona | 501(c)(3) | 2025 | |||
| Conservation Ag Foundation Inc | Brookfield | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Couillard Solar Foundation Inc | Deerfield | 501(c)(3) | 2018 | $4.3 million | 2024-12 | |
| Coulee Region Audubon Society Inc | La Crosse | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Crab Lake Conservation Foundation Inc | Franklin | 501(c)(3) | 1995 | $290,720 | 2025-06 | |
| Cranberry Lake-Flowage Association | Wascott | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Crescent Cactus Corporation | Milwaukee | 501(c)(3) | 2024 | |||
| Crescent Lake Association Inc | Rhinelander | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Cross Country Cruisers | Boyd | 501(c)(4) | 2013 | $0 | $0 | 2025-12 |
| Crowned & Covered Foundation Inc | Racine | 501(c)(3) | 2026 | $0 | $0 | 2025-05 |
| Crystal Lake Association | Pickerel | 501(c)(3) | 2024 | $0 | $0 | 2025-09 |
| Daylily Society of Southeast Wisconsin Inc | Oak Creek | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Decatur Lake and Mill Race Association Inc | Brodhead | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Deerskin Lake Association Inc | Eagle River | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Delavan Rotary Gardens Foundation Inc | Delavan | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| Des Moines Lake Association Inc | Danbury | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Desair Lake Restoration Inc | Rice Lake | 501(c)(3) | 2023 | $0 | $0 | 2025-09 |
| Devils Lake Property Owners Assoc Inc | Webster | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Diamond Lakers | Cable | 501(c)(3) | 2020 | $0 | $0 | 2026-06 |
| Dodge County Healthy Soil Healthy Water Alliance Inc | Beaver Dam | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Dodge County Land Trust Incorporated | Watertown | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Dodge County Master Gardener Association | Beaver Dam | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Door County Beekeepers Club Association | Brussels | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Door County Master Gardeners Association Inc | Sturgeon Bay | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Door Garden Club Inc | Ephraim | 501(c)(3) | 2023 | $0 | $0 | 2023-06 |
| Driftless Birds Inc | Onalaska | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Driftless Compost Collective Incorp Erated | La Farge | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Driftless Curiosity Inc | Viola | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Driftless Defenders Inc | Spring Green | 501(c)(3) | 2022 | $0 | $0 | 2026-01 |
| Drifts Edge Nature Conservatory | Belleville | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Drumlin Area Land Trust Inc | Fort Atkinson | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Dubay Property Owners Association Inc | Junction City | 501(c)(3) | 2017 | $0 | $0 | 2026-04 |
| Eagle Lake Improvement Association | Kansasville | 501(c)(3) | 2017 | $0 | $0 | 2026-03 |
| Eagle Nature Trail Inc | Eagle | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Earth Conclave Inc | Milwaukee | 501(c)(3) | 1994 | $0 | $0 | 2024-10 |
| Earthology Institute | Viroqua | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Eau Claire Area Master Gardeners Association | Eau Claire | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Eau Claire River Watershed Association Ecrwa Inc | Augusta | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Eco Synergy Partners | Mount Horeb | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Eco-Vision Sustainable Learning Center Inc | Delavan | 501(c)(3) | 2011 | $0 | $0 | 2024-12 |
| Elkhart Lake Improvement Association Inc | Elkhart Lake | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Ellies Fund Inc | Green Bay | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Enhance Alma Inc | Nelson | 501(c)(3) | 2015 | $0 | $0 | 2023-12 |
| Environment & Public Health Networkfor Chinese Students and Scholars | Madison | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Environmental Alliance-Us-China Environmental Fund Corp | Mount Horeb | 501(c)(3) | 1989 | $0 | $0 | 2024-12 |
| Environmental Data Institute Inc | Madison | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| FDL Long Lake Preservation Association Inc | Cascade | 501(c)(3) | 2011 | $0 | $0 | 2026-04 |
| Fair Future Movement Inc | Milwaukee | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Faye Gehl Conservation Foundation Inc | Hartland | 501(c)(3) | 1994 | $9.6 million | 2025-12 | |
| Fire Lake Conservation Association | Iron River | 501(c)(3) | 2026 | |||
| Fish Lake Property Owners Association Inc | Danbury | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Flannel River Inc | River Falls | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Flannery Velvet Lake Association Inc | Rhinelander | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Fond Du Lac Area Bird and Nature Alliance | Fond Du Lac | 501(c)(3) | 2014 | $0 | $0 | 2026-05 |
| Fond Du Lac County Master Gardner Association | Fond Du Lac | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Fontana Garden Club Inc | Fontana | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Forest County Association of Lakes | Pickerel | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Forest Lake Association Inc | Land O Lakes | 501(c)(7) | 2014 | $0 | $0 | 2025-12 |
| Fountain City Rod and Gun Club Inc | Fountain City | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Fox River Watershed C A U S E Inc | Waterford | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| Fox Valley Beekeepers Wi | Greenville | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Franklin Lake Improvement Association | Madison | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Friends of Allen Centennial Gardens | Madison | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Friends of Back Bay Park LTD | Milwaukee | 501(c)(3) | 2015 | $11,005 | 2024-12 | |
| Friends of Badger Mill Creek Conser Vancy | Verona | 501(c)(3) | 2026 | |||
| Friends of Belmont Mound State Park | Belmont | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of Big Ripley Lake Associat Ion Inc | Shell Lake | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Friends of Brunet Island State Park Inc | Cornell | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Cherokee Marsh Inc | Madison | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Friends of Echo Lake and Dam Burlington Wi | Burlington | 501(c)(3) | 2023 | $10,730 | 2025-12 | |
| Friends of Evergreen Park Inc | Sheboygan | 501(c)(3) | 2026 | |||
| Friends of Fence Lake Inc | Minocqua | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of Finger Lake Incorporated | Eagle River | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Friends of Fitchburg Wisconsin Park S and Natural Areas Inc | Fitchburg | 501(c)(3) | 2025 | $0 | $0 | 2025-09 |
| Friends of Governor Thompson State Park Corporation | Wausaukee | 501(c)(3) | 2006 | $0 | $0 | 2025-09 |
| Friends of Hickory Ridge Trail Inc | Chippewa FLS | 501(c)(3) | 2001 | $0 | $0 | 2026-04 |
| Friends of Horicon National Wildlife Refuge | Mayville | 501(c)(3) | 2003 | $0 | $0 | 2025-09 |
| Friends of Indian Lake County Park | Madison | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Friends of Jackson JT Parks & Recreation | Jackson | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Friends of Junction Ridge Park and Prairie | Madison | 501(c)(3) | 2026 | |||
| Friends of Lake Altoona | Altoona | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of Lake Emily | Amherst JCT | 501(c)(3) | 2026 | |||
| Friends of Lake Mohawksin Inc | Tomahawk | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Friends of Lone Stone | Clintonville | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Long Lake Inc | Saxeville | 501(c)(3) | 1995 | $0 | $0 | 2026-06 |
| Friends of McCarthy Park Inc | Cottage Grove | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Friends of McGilvray Road Inc | La Crosse | 501(c)(3) | 1993 | $0 | $0 | 2025-12 |
| Friends of Moose Lake | Antigo | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Friends of Namekagon Barrens Wildlife Area | Spooner | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Friends of New Glarus Woods State Park Inc | New Glarus | 501(c)(3) | 2014 | $0 | $0 | 2025-10 |
| Friends of North Prairie Native Gardens | North Prairie | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Friends of Owen Conservation Park Inc | Madison | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Friends of Perch Lake Inc | Hudson | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Friends of Rib Mountain State Park Inc | Rib Mountain | 501(c)(3) | 1993 | $0 | $0 | 2024-12 |
| Friends of Ridgeway Pine Relict Sna Inc | Appleton | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Friends of Rowan Creek Inc | Poynette | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Friends of Six Mile Creek Inc | Waunakee | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Friends of Trempealeau Lakes | Trempealeau | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of Trempealeau Refuge Inc | Trempealeau | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Friends of Vernon County Parks & Forests Inc | Viroqua | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Vernon Marsh Inc | Waukesha | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Friends of Waubesa Wetlands Inc | Madison | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Willow River Cemetery Inc | Hudson | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of the Ahnapee State Trail Inc | Kewaunee | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Friends of the Baraboo River Inc | Reedsburg | 501(c)(3) | 2016 | $0 | $0 | 2024-12 |
| Friends of the Black River Inc | BLK River FLS | 501(c)(3) | 2004 | $0 | $0 | 2026-01 |
| Friends of the Blufflands Inc | La Crosse | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Friends of the Branch River | Whitelaw | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Friends of the Gile Flowage Inc | Montreal | 501(c)(3) | 2007 | $0 | $0 | 2023-12 |
| Friends of the Gottfried Prairie and Arboretum Inc | Fond Du Lac | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
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.