Data / Nonprofits / Iowa / Environment
Environment nonprofits in Iowa: 347 registered with the IRS
347 environment nonprofits are registered with the IRS in Iowa, 330 of them 501(c)(3) charities; the 107 that report revenue took in $136.6 million. The most are in Des Moines (24), Iowa City (15), Cedar Rapids (12). The largest by revenue: Iowa Natural Heritage Foundation ($53.2 million), Greater Des Moines Botanical Garden ($11.8 million), Iowa Confluence Water Trails ($10.4 million).
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Every organization, largest by revenue first
| Organization | City | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Iowa Natural Heritage Foundation | Des Moines | 501(c)(3) | 1979 | $53.2 million | $156.1 million | 2025-06 |
| Greater Des Moines Botanical Garden | Des Moines | 501(c)(3) | 1970 | $11.8 million | $31.4 million | 2025-06 |
| Iowa Confluence Water Trails | Des Moines | 501(c)(3) | 2023 | $10.4 million | $52.1 million | 2025-06 |
| Conservation Foundation of Dickinson County | Okoboji | 501(c)(3) | 1998 | $6.4 million | $1.6 million | 2024-12 |
| Water Professionals International | Urbandale | 501(c)(3) | 1987 | $3.7 million | $4.1 million | 2025-09 |
| Trees Forever Inc | Marion | 501(c)(3) | 1995 | $3.7 million | $4.2 million | 2025-12 |
| Iowa Agriculture Water Alliance | Ankeny | 501(c)(3) | 2014 | $3.4 million | $2.7 million | 2025-09 |
| Talent Collective DSM | Des Moines | 501(c)(3) | 1986 | $2.9 million | $11.4 million | 2025-06 |
| The Spirit of Okoboji | Okoboji | 501(c)(3) | 2018 | $2.6 million | $11 million | 2025-12 |
| Pathfinders Resource Conservation and Development Area Inc | Fairfield | 501(c)(3) | 1979 | $2.4 million | $2.1 million | 2025-06 |
| Indian Creek Nature Center | Cedar Rapids | 501(c)(3) | 1973 | $1.9 million | $11.3 million | 2025-12 |
| Deb & Jeff Hansen Foundation | WDM | 501(c)(3) | 2006 | $1.9 million | $7.3 million | 2024-12 |
| Iowa Environmental Council | Des Moines | 501(c)(3) | 1996 | $1.9 million | $2.1 million | 2024-12 |
| Clean Energy Districts of Iowa | Decorah | 501(c)(3) | 2019 | $1.7 million | $1.5 million | 2025-12 |
| Iowa Valley Resource Conservation & Development | Amana | 501(c)(3) | 1999 | $1.6 million | $519,708 | 2025-12 |
| Nahant Marsh Education Center | Davenport | 501(c)(3) | 2006 | $1.4 million | $5.4 million | 2025-12 |
| Iowa Agricultural Mitigation | Boone | 501(c)(5) | 2011 | $1.4 million | $1.7 million | 2025-12 |
| Whiterock Conservancy | Coon Rapids | 501(c)(3) | 2006 | $1.4 million | $24.6 million | 2024-12 |
| Soil and Water Conservation Society | Ankeny | 501(c)(3) | 1963 | $1.2 million | $2 million | 2025-03 |
| Iowa State Snowmobile Association | Thompson | 501(c)(4) | 2026 | $1.2 million | $1.5 million | 2024-12 |
| Resource Conservation and Development for Northeast Iowa Inc | Postville | 501(c)(3) | 1989 | $1.2 million | $2.5 million | 2025-09 |
| Agricultures Clean Water Alliance | Ankeny | 501(c)(3) | 2002 | $1.2 million | $311,922 | 2026-02 |
| Iowa Nutrient Research and Education Council | Des Moines | 501(c)(3) | 2016 | $1.1 million | $355,958 | 2025-12 |
| Iowa Arboretum Inc | Madrid | 501(c)(3) | 1968 | $1.1 million | $6.4 million | 2025-12 |
| Sustainable Iowa Land Trust | West Branch | 501(c)(3) | 2015 | $945,139 | $3.8 million | 2025-12 |
| Mason City Foundation | Mason City | 501(c)(3) | 1991 | $909,263 | $5.7 million | 2024-12 |
| Green Schools National Network Inc | Iowa City | 501(c)(3) | 2008 | $791,499 | $151,071 | 2025-06 |
| Golden Hills Resource Conservation and Development Area | Oakland | 501(c)(3) | 1987 | $783,865 | $1 million | 2024-12 |
| Build A Better Belmond | Belmond | 501(c)(3) | 2026 | $731,768 | $1.3 million | 2025-06 |
| Dubuque Arboretum Association Inc | Dubuque | 501(c)(3) | 1981 | $659,933 | $3.3 million | 2025-12 |
| William G Stowe Memorial Foundation | Des Moines | 501(c)(3) | 2022 | $618,495 | $809,552 | 2025-12 |
| Keep Iowa Beautiful | Johnston | 501(c)(3) | 2000 | $614,213 | $409,539 | 2025-12 |
| Iowa Business for Clean Energy | WDM | 501(c)(3) | 2020 | $526,784 | $419,160 | 2024-12 |
| Newton Arboretum & Botanical Gardens Inc | Newton | 501(c)(3) | 1995 | $505,957 | $1.5 million | 2025-06 |
| Iowa Drainage District Assoc | WDM | 501(c)(6) | 2001 | $365,588 | $134,296 | 2026-06 |
| Southwest Iowa Nature Trails Project Inc | Imogene | 501(c)(3) | 1995 | $352,427 | $843,891 | 2024-12 |
| Iowa Storm Water Education Partnership | Des Moines | 501(c)(3) | 2016 | $304,427 | $207,339 | 2025-06 |
| Cedar Valley Arboretum & Botanic Gardens | Waterloo | 501(c)(3) | 1996 | $300,377 | $811,734 | 2024-12 |
| Agricultural Drainage Management Coalition Inc | Ankeny | 501(c)(5) | 2005 | $299,322 | $29,373 | 2024-12 |
| Clinton County Conservation Foundation Inc | Grand Mound | 501(c)(3) | 1998 | $297,780 | $552,000 | 2024-12 |
| Iowa Great Lakes Foundation | Des Moines | 501(c)(3) | 2015 | $279,697 | $749,200 | 2024-12 |
| Iowa Great Lakes Beautification | Okoboji | 501(c)(3) | 2019 | $273,932 | $4.4 million | 2025-12 |
| Eastern Iowa Conservation Foundation LTD | Dubuque | 501(c)(3) | 2022 | $271,411 | $785,688 | 2025-08 |
| Iowa Water Environment Association | Ames | 501(c)(6) | 1975 | $266,164 | $394,813 | 2024-12 |
| Energy Association of Iowa Schools | Creston | 501(c)(3) | 2013 | $237,750 | $251,778 | 2025-06 |
| Izaak Walton League of America Inc | Newton | 501(c)(3) | 1985 | $237,549 | $232,078 | 2025-08 |
| Iowa Interfaith Power and Light Iowa Faith and Climate Network | Des Moines | 501(c)(3) | 2009 | $236,374 | $207,538 | 2025-08 |
| Rathbun Land and Water Alliance Inc | Centerville | 501(c)(3) | 2003 | $225,659 | $54,407 | 2025-09 |
| Des Moines Chapter of the Izaak Walton League of America | Des Moines | 501(c)(3) | 1972 | $218,955 | $351,835 | 2025-12 |
| Sioux County Conservation Foundation | Hawarden | 501(c)(3) | 2014 | $213,219 | $258,940 | 2024-12 |
| Friends of Winnebago County Conservation Foundation Inc | Forest City | 501(c)(3) | 2014 | $203,786 | $306,338 | 2023-12 |
| Indian Creek Nature Center Charitable Trust | Cedar Rapids | 501(c)(3) | 1988 | $188,697 | $2.2 million | 2025-12 |
| A M O S-A Metropolitan Organizing Strategy | Des Moines | 501(c)(4) | 1999 | $188,065 | $407,482 | 2026-06 |
| Holiday Lights at the Lake | Coralville | 501(c)(3) | 2025 | $184,680 | $139,801 | 2024-12 |
| Solid Waste Association of North America Inc | Storm Lake | 501(c)(3) | 1986 | $175,619 | $85,594 | 2026-06 |
| Winneshiek Energy District | Decorah | 501(c)(3) | 2011 | $169,889 | $259,472 | 2025-12 |
| N-Compass Inc | Marion | 501(c)(3) | 2017 | $169,014 | $207,945 | 2025-12 |
| Izaak Walton League of America Inc | Cedar Rapids | 501(c)(3) | 1985 | $161,761 | $702,082 | 2024-12 |
| New Horizons Inc | New Hampton | 501(c)(3) | 1993 | $143,070 | $182,192 | 2025-12 |
| Woodbury County Conservation Foundation | Sioux City | 501(c)(3) | 1991 | $136,765 | $97,189 | 2025-06 |
| Shelby County Trails Board Inc | Harlan | 501(c)(3) | 2016 | $132,429 | $242,377 | 2023-12 |
| 1000 Friends of Iowa | Des Moines | 501(c)(3) | 1998 | $131,527 | $20,415 | 2025-12 |
| Benton County Conservation Foundation | Vinton | 501(c)(3) | 2010 | $123,870 | $203,442 | 2024-12 |
| Jefferson County Farmers and Neighbors Inc | Fairfield | 501(c)(3) | 2006 | $118,608 | $82,433 | 2024-12 |
| Friends of Webster County Conservation | Fort Dodge | 501(c)(3) | 2007 | $116,355 | $573,388 | 2025-12 |
| Conservation Foundation of Jefferson County Iowa | Fairfield | 501(c)(3) | 2022 | $112,853 | $140,012 | 2025-12 |
| Izaak Wlaton League of America Inc | Des Moines | 501(c)(3) | 1985 | $107,379 | $803,983 | 2025-12 |
| Logansport Water System | Boone | 501(c)(4) | 2014 | $103,931 | $1.5 million | 2025-12 |
| Friends of Jackson County Conservation | Maquoketa | 501(c)(3) | 2001 | $102,399 | $304,238 | 2026-06 |
| Izaak Walton League of America Inc | Davenport | 501(c)(3) | 1982 | $98,300 | $86,195 | 2025-08 |
| Five Island Trail Corporation | Emmetsburg | 501(c)(3) | 2014 | $91,637 | $86,664 | 2024-12 |
| Driftless Water Defenders | Iowa City | 501(c)(3) | 2024 | $85,784 | $80,377 | 2025-12 |
| Friends of Calkins Nature Area | Iowa Falls | 501(c)(3) | 2025 | $81,164 | $231,896 | 2025-12 |
| Friends of Clay County Conservation Foundation Inc | Spencer | 501(c)(3) | 2023 | $81,049 | $338,661 | 2025-12 |
| Dallas County Conservation Foundation | Perry | 501(c)(3) | 1994 | $80,831 | $294,263 | 2024-12 |
| Friends of Lake Panorama | Panora | 501(c)(3) | 2014 | $79,253 | $52,270 | 2025-12 |
| Forest City Enhancement Committee | Forest City | 501(c)(3) | 2020 | $76,290 | $239,337 | 2025-12 |
| Iowa Recycling Association Incorporated | Davenport | 501(c)(3) | 1994 | $71,187 | $106,338 | 2025-06 |
| Iowa Association for Energy Efficiency | Pleasant Hill | 501(c)(3) | 1980 | $69,724 | $71,145 | 2025-12 |
| Leopold Landscape Alliance | Burlington | 501(c)(3) | 2014 | $67,045 | $898,549 | 2025-12 |
| Friends of Lake Darling State Park | Brighton | 501(c)(3) | 2006 | $59,460 | $841,952 | 2025-06 |
| Friends of the Yellow River State Forest Inc | Harpers Ferry | 501(c)(3) | 2018 | $57,211 | $111,389 | 2025-12 |
| Linn County Community Action Fund | Cedar Rapids | 501(c)(3) | 2021 | $53,043 | $13,021 | 2025-12 |
| Ida County Conservation Foundation | Ida Grove | 501(c)(3) | 1996 | $52,376 | $82,890 | 2025-12 |
| Izaak Walton League Ottumwa Chapter | Ottumwa | 501(c)(3) | 1985 | $51,186 | $348,205 | 2024-12 |
| Carroll County Conservation Foundation | Carroll | 501(c)(3) | 1996 | $46,372 | $112,654 | 2025-06 |
| Worth County Conservation Foundation | Northwood | 501(c)(3) | 2007 | $46,228 | $1.4 million | 2024-12 |
| Limestone Bluffs Resource Conservation and Development Inc | Mechanicsvlle | 501(c)(3) | 1993 | $45,863 | $284,514 | 2025-06 |
| Northern Iowa River Greenbelt Association | Belmond | 501(c)(3) | 1992 | $37,437 | $111,929 | 2025-12 |
| Allamakee County Conservation Foundation | Lansing | 501(c)(3) | 2011 | $32,345 | $292,079 | 2025-12 |
| Des Moines Founders Garden Club | WDM | 501(c)(3) | 1966 | $29,208 | $75,208 | 2025-06 |
| The Federated Garden Clubs of Iowa Inc | Knoxville | 501(c)(3) | 2001 | $24,920 | $63,866 | 2026-07 |
| Waters Edge Nature Center Foundation | Algona | 501(c)(3) | 2002 | $23,009 | $448,126 | 2025-12 |
| Association for the Preservation of Clear Lake | Clear Lake | 501(c)(3) | 2004 | $18,850 | $297,252 | 2024-12 |
| Friends of Carlisle Parks Inc | Carlisle | 501(c)(3) | 2016 | $18,000 | $42,095 | 2025-12 |
| Grindstone Lake Foundation Inc | Cedar Rapids | 501(c)(3) | 2019 | $14,391 | $762,651 | 2025-12 |
| Friends of Iowa County Conservation Foundation | Williamsburg | 501(c)(3) | 2002 | $11,996 | $110,616 | 2024-12 |
| Iowa Conservation Educationcoalition Inc | Ackley | 501(c)(3) | 2010 | $11,102 | $52,585 | 2025-12 |
| Rice Lake Chapter of the Izaak Walton League of America Inc | Lake Mills | 501(c)(4) | 2013 | $11,007 | $68,697 | 2025-12 |
| Iowa Native Plant Society | Urbandale | 501(c)(3) | 1999 | $9,726 | $20,130 | 2025-12 |
| Back To Ground Natural Burial Cemetery | Iowa City | 501(c)(3) | 2025 | $9,154 | $8,954 | 2025-06 |
| Technical Service Providers Network Inc | Ames | 501(c)(3) | 2014 | $6,740 | $10,376 | 2025-08 |
| Dubuque County Master Gardeners Inc | Asbury | 501(c)(3) | 2004 | $5,203 | $15,490 | 2025-12 |
| Growing Green Communities Inc | Des Moines | 501(c)(3) | 2004 | $5,033 | $100,769 | 2025-12 |
| The Federated Garden Clubs of Iowa Inc | Pella | 501(c)(3) | 2001 | $3,222 | $68,936 | 2025-12 |
| The Carter Lake Preservation Society Inc | Carter Lake | 501(c)(3) | 2006 | $17 | $6,651 | 2025-12 |
| 100grannies for A Livable Future | Iowa City | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Actgreen Impact Fund | Buffalo Center | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Adams County Conservation Foundation | Corning | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Agua Es Vida - PR Inc | Council BLFS | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Allamakee Energy District | Waukon | 501(c)(3) | 2020 | $0 | $0 | 2024-12 |
| Armstrong Heritage Museum | Armstrong | 501(c)(3) | 1991 | $0 | $0 | 2025-12 |
| Backbone Lake Friends Inc | Elkader | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Belmond Trees Forever | Belmond | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Big River Conservationists Inc | Davenport | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Black Iowa Outdoors | Ankeny | 501(c)(3) | 2026 | |||
| Blackhawk Lake Resoration Fund | Lake View | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Blue Devil Athletic Foundation | Davenport | 501(c)(3) | 2013 | $0 | $0 | 2025-06 |
| Boone County Conservation Foundation | Ogden | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Bremer County Nature Alliance | Tripoli | 501(c)(3) | 2020 | $0 | $0 | 2024-12 |
| Buchanan County Four Seasons Trails Association | Independence | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Byways of Iowa Foundation | Postville | 501(c)(3) | 2016 | $0 | $0 | 2025-09 |
| Cascade Community Enhancement Corp | Cascade | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Cedar Rapids and Iowa City Walleye Club | Cedar Rapids | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Cedar Valley Association for Soft Trails | Cedar Falls | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Cedar Valley Trails Partnership | Cedar Falls | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Centerville Garden Club | Centerville | 501(c)(3) | 2001 | $0 | $0 | 2026-07 |
| Central Iowa Daylily Society | Cedar Falls | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Cerro Gordo Clean Energy District | Clear Lake | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Chariton River Greenbelt Foundation | Chariton | 501(c)(3) | 1997 | $0 | $0 | 2026-06 |
| Clayton County Energy District | Elkader | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Climate March | Des Moines | 501(c)(3) | 2013 | $0 | $0 | 2026-02 |
| Clinton Trees Forever | Clinton | 501(c)(3) | 2014 | $0 | $0 | 2025-08 |
| Compost Disposal Services | Oelwein | 501(c)(3) | 2026 | |||
| Conservation Creations | Jewell | 501(c)(3) | 2025 | |||
| Cool Arrow Foundation | Cedar Falls | 501(c)(3) | 2026 | |||
| Coralx Foundation Inc | Cedar Falls | 501(c)(3) | 2023 | $0 | $0 | 2025-08 |
| Corridor Outdoor Adventures | Solon | 501(c)(3) | 2020 | $4,183 | 2025-12 | |
| Council Bluffs Trees Forever | Council BLFS | 501(c)(3) | 1994 | $0 | $0 | 2025-12 |
| Crescent Forest | Honey Creek | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Delaware County Energy District | Manchester | 501(c)(3) | 2019 | $0 | $0 | 2023-12 |
| Des Moines Audubon Society | Clive | 501(c)(3) | 1994 | $0 | $0 | 2026-06 |
| Des Moines County Energy District | Burlington | 501(c)(3) | 2025 | |||
| Des Moines County Nature Trails Association Inc | Burlington | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Des Moines Herb Study Group | Des Moines | 501(c)(3) | 2013 | $0 | $0 | 2025-08 |
| Dickinson County Community Gardens | Spirit Lake | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Dickinson County Conservation Endowment Inc | Lake Park | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Dubuque Audubon Society | Dubuque | 501(c)(3) | 1999 | $0 | $0 | 2025-06 |
| Dubuque County Energy District | Dubuque | 501(c)(3) | 2021 | $0 | $0 | 2024-06 |
| Dubuque Farmer To Farmer | Dubuque | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Dubuque Field Archers | Peosta | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Dubuque Trees Forever | Dubuque | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Eagle Point Nature Society | Clinton | 501(c)(3) | 1972 | $0 | $0 | 2025-09 |
| Earthmind Practice | Iowa City | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Eastern Iowa Outdoors Foundation Inc | Anamosa | 501(c)(3) | 2026 | |||
| Energy 2 0 Society Inc | Mount Vernon | 501(c)(3) | 2014 | $0 | $0 | 2024-12 |
| Environmental Habitat Corporation | Jefferson | 501(c)(3) | 2023 | $1 | 2024-08 | |
| Environmental Law Collaborative | Iowa City | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Fair Haven Memorial Garden Inc | Pella | 501(c)(3) | 2026 | |||
| Fayette County Ems Association | Fayette | 501(c)(3) | 2026 | |||
| Fisher Lake Wildlife Preserve | Des Moines | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Five Island Lake Association | Emmetsburg | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| For the Good Ole Birds | Redfield | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Forest Forever | Prole | 501(c)(3) | 1993 | $0 | $0 | 2024-12 |
| Fort Dodge Area Gardeners Inc | Fort Dodge | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Fort Madison Community Beautification Foundation Inc | Fort Madison | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Ada Hayden Heritage Park | Ames | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Friends of Beeds Lake | Hampton | 501(c)(3) | 2025 | |||
| Friends of Bellevue State Park Inc | Bellevue | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of Blood Run | Larchwood | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Brookside Park | Ames | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Bunker Mill Bridge Inc | Kalona | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Friends of Chickasaw County Conservation | Ionia | 501(c)(3) | 2000 | $0 | $0 | 2024-12 |
| Friends of Conservation Inc | Cherokee | 501(c)(3) | 1993 | $0 | $0 | 2025-12 |
| Friends of Conservation in Henrycounty LTD | Mt Pleasant | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Friends of Emma McCarthy Lee Park | Ames | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Friends of Fairmount Cemetery and Preservation Group | Davenport | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Greene County Iowa Parks | Rippey | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Friends of Heery Woods Nature Center | Clarksville | 501(c)(3) | 1997 | $0 | $0 | 2024-06 |
| Friends of Iowa Waters Inc | Iowa City | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Friends of Johnson County Conservation | Oxford | 501(c)(3) | 2015 | $0 | $0 | 2026-06 |
| Friends of Jones County Conservation and Nature Center | Center JCT | 501(c)(3) | 2016 | $0 | $0 | 2023-12 |
| Friends of Loess Hills State Forest and Preparation Canyon State Park | Mondamin | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Mahaska County Conversation Inc | Rose Hill | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Friends of Morris Park | Keosauqua | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Friends of Norwalk Parks | Norwalk | 501(c)(3) | 2026 | |||
| Friends of Oaks and Prairies | Long Grove | 501(c)(3) | 2026 | |||
| Friends of Palisades-Kepler State Park | Mount Vernon | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Pool 9-Upper Miss Refuge Inc | Lansing | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Friends of Union Slough National Wildlife Refuge Inc | Titonka | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Friends of Waubonsie State Park | Randolph | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Friends of Yellow Smoke Inc | Denison | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Friends of the Decorah Fish Hatchery | Decorah | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Friends of the Hampton Tree Board | Hampton | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Friends of the Marquette Driftless Area | Marquette | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Friends of the Marshall County Conservation Incorporated | Marshalltown | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of the Red Oak Trail Inc | Red Oak | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Friends of the Root River Inc | Decorah | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Gothic Area Tourism of Eldon Corporation | Eldon | 501(c)(3) | 2008 | $0 | $0 | 2025-09 |
| Green Hollow Center Inc | WDM | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Hares Pond Recreational Park Inc | Rowley | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Hawkeye Point Foundation | Sibley | 501(c)(3) | 2010 | $0 | $0 | 2026-06 |
| Hazleton Veterans Park | Oelwein | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Heartland Conservation Fund Inc | Clive | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Heritage Outdoos | Prole | 501(c)(3) | 2026 | |||
| Herpmapper Inc | Muscatine | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Hoosier Creek Conservation and Retr Iever Association | Cedar Rapids | 501(c)(3) | 2026 | |||
| Hosta Seed Growers | Iowa City | 501(c)(7) | 2014 | $0 | $0 | 2025-12 |
| Howard County Energy District | Cresco | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Howard County Environmental & Conservation Education Foundation | Cresco | 501(c)(3) | 2006 | $0 | $0 | 2026-06 |
| Iowa Arborists Association | Johnston | 501(c)(5) | 2003 | $0 | $0 | 2025-12 |
| Iowa Blood Trackers Association | Clear Lake | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Iowa Climbers Coalition | Iowa City | 501(c)(3) | 2026 | |||
| Iowa Conservation Alliance Inc | Jefferson | 501(c)(4) | 2012 | $0 | $0 | 2025-12 |
| Iowa Conservative Energy Forum | WDM | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Iowa Energy Fund | WDM | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Iowa Environmental Health Associat | Waterloo | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Iowa Mormon Trails Association Inc | Corydon | 501(c)(3) | 1994 | $0 | $0 | 2025-06 |
| Iowa Prairie Network Inc | Iowa City | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Iowa Renewable Energy Association | Hiawatha | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Iowa Rural Power Education Foundation | Urbandale | 501(c)(4) | 2018 | $0 | $0 | 2025-12 |
| Iowa Smallmouth Alliance | Ankeny | 501(c)(3) | 2023 | $521 | 2024-12 | |
| Iowa Trust for Local Conservation | Osage | 501(c)(3) | 2003 | $0 | $0 | 2025-06 |
| Iowa Urban Tree Council | Pleasant Hill | 501(c)(3) | 2013 | $0 | $0 | 2024-12 |
| Iowa Weed Commission Association | Central City | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| Iowa Wetland Mitigation Bank Inc | WDM | 501(c)(3) | 2001 | $0 | $0 | 2025-10 |
| Iowa Wildlife United | Lone Tree | 501(c)(3) | 2014 | $0 | $0 | 2024-12 |
| Iowa Woodland Owners Alliance | Davenport | 501(c)(3) | 2026 | |||
| Iowa Young Birders | Ames | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| Iowas Coldwater Conservancy Inc | Muscatine | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Izaak Walton League of America Inc | Victor | 501(c)(3) | 1985 | $0 | $0 | 2025-12 |
| Jackson County Energy District | Maquoketa | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Johnson Clean Energy District | Iowa City | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Jon A White Memorial Wildlifehabitat and Meditation Garden Inc | Des Moines | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Keep Iowa Beautiful-Hometown Pride | Camanche | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Keep Scott County Beautiful | Davenport | 501(c)(3) | 2005 | $0 | $0 | 2025-06 |
| Lake City Food Pantry Corp | Lake City | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Lake Panorama Fin & Feather Association | Panora | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Life Light Africa | Des Moines | 501(c)(3) | 2026 | |||
| Lifesource Foundation | Iowa City | 501(c)(3) | 2026 | |||
| Linn Clean Energy District | Cedar Rapids | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Little Sioux Valley Conservation Association | Peterson | 501(c)(3) | 1995 | $0 | $0 | 2024-12 |
| Littleport Park Inc | Elkader | 501(c)(4) | 2013 | $0 | $0 | 2025-12 |
| Loess Hills Sports Club | Manilla | 501(c)(3) | 2026 | |||
| Loess Hills- Elysian Prairie Restoration and Conservation Proje | Castana | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Lost Island Protective Association | Ruthven | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Love Your Neighbor Farm | Solon | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Madison County River Alliance | Winterset | 501(c)(3) | 2011 | $0 | $0 | 2024-12 |
| Manna of Worth County Inc | Northwood | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Marie H Ketelsen Learning Center for Children Inc | Delmar | 501(c)(3) | 1995 | $106,818 | 2025-12 | |
| Marshall County Chapter of the Izaak Walton League of America | Marshalltown | 501(c)(3) | 1982 | $0 | $0 | 2025-12 |
| Melvin 313 Club | Melvin | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Milkweed Matters | Pacific JCT | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Miller Boys Keeping the Christmas Spirit Alive Inc | West Union | 501(c)(3) | 2024 | |||
| Millers Bay Conservancy | Milford | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Missouri Valley African Violet Council | Sioux City | 501(c)(3) | 2010 | $0 | $0 | 2026-05 |
| Montgomery County Conservation Foundation | Red Oak | 501(c)(3) | 2021 | $0 | $0 | 2026-06 |
| Muscatine Arboretum Association | Muscatine | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Muscatine County Conservation Foundation | Muscatine | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Muscatine County Energy District | Muscatine | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| National Pollution Prevention Roundtable | Cedar Falls | 501(c)(3) | 1992 | $0 | $0 | 2025-09 |
| Natopakama Bittersweet Inc | Center Point | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Natural Law Trust | Fairfield | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Nebraska Daylily Society | Oakland | 501(c)(5) | 1988 | $0 | $0 | 2025-12 |
| Networked Transmission Systems Inc | Mount Vernon | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Nishnabotna Conservation Foundation | Harlan | 501(c)(3) | 2007 | $0 | $0 | 2026-06 |
| Nishnabotna Water Defenderss | Atlantic | 501(c)(3) | 2025 | $0 | $0 | 2025-06 |
| Oh Happy Play LLC | Dubuque | 501(c)(3) | 2023 | $0 | $0 | 2024-12 |
| Operation 11TH Hour | Independence | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Oskaloosa Trees Forever | Oskaloosa | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Outdoor Alliance of Story County | Ames | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| PKW & SK Charities | Maquoketa | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Partners for the Future - Dickinson County Land Air and Water | Okoboji | 501(c)(3) | 2015 | $0 | $0 | 2023-12 |
| Partners of Scott County Watersheds | Davenport | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Partners of the Parks | Granger | 501(c)(3) | 2013 | $0 | $0 | 2026-06 |
| Paxton Family Trust | Storm Lake | 501(c)(3) | 2006 | $515,350 | 2026-06 | |
| Peace Corner Community | Cedar Rapids | 501(c)(3) | 2026 | |||
| Plant Washington | Washington | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Plymouth Betterment Committee Inc | Plymouth | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Polk City Arbor League Inc | Polk City | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Pollinator Alliance of the Heartland | Council BLFS | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Poweshiek County Whitetails Conservation | Malcom | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Prairie Fire Foundation | Iowa City | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Prairie Forever Conservancy | Cedar Rapids | 501(c)(3) | 2025 | $59,955 | 2024-12 | |
| Project Green Inc | Iowa City | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Quad City Audubon Society | Bettendorf | 501(c)(3) | 1991 | $0 | $0 | 2025-12 |
| Rabbit Hollow Nature Conservancy Inc | Dubuque | 501(c)(3) | 2023 | $1.5 million | 2024-12 | |
| Raptology Inc | Iowa City | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Regen Gardens | Waterloo | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Repurpose Rising | Des Moines | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Rhino Momma Incorporated | Lone Rock | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Ringgold Conservation Foundation Inc | Mount Ayr | 501(c)(3) | 2015 | $0 | $0 | 2023-12 |
| River Development Inc | Humboldt | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Rock Creek Lake Alliance | Grinnell | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Sande Land Subdivision Water System Inc | Adel | 501(c)(12) | 2014 | $0 | $0 | 2024-12 |
| Saving Wild Animals and Native Species Inc | Fairfield | 501(c)(3) | 2025 | |||
| Scott County Beautification Foundation | Davenport | 501(c)(3) | 1994 | $0 | $0 | 2025-12 |
| Silver Lake Improvement Project - Palo Alto | Ruthven | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Sioux City Garden Club | Sioux City | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Slpia Inc | Lake Park | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Society of American Foresters | Letts | 501(c)(3) | 1971 | $0 | $0 | 2025-12 |
| Soil Enhancement and Subsurface Water Management Coalition | Dexter | 501(c)(5) | 2022 | $0 | $73,767 | 2026-03 |
| Southfork Watershed Alliance Inc | Iowa Falls | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Sunshine Garden Club of Winterset Iowa | Van Meter | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Sustainable Community Development A Ssociation | Fairfield | 501(c)(3) | 2026 | |||
| Sustainable Independence | Brandon | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Tallgrass Prairie Audubon Society | Grinnell | 501(c)(3) | 1992 | $0 | $0 | 2025-12 |
| Tama County Clean Energy | Montour | 501(c)(3) | 2025 | |||
| The Federated Garden Clubs of Iowa | Gowrie | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| The Federated Garden Clubs of Iowa Inc | Estherville | 501(c)(3) | 2025 | |||
| The Federated Garden Clubs of Iowa Inc | Cedar Rapids | 501(c)(3) | 2001 | $0 | $0 | 2025-07 |
| The Federated Garden Clubs of Iowa Inc | Muscatine | 501(c)(3) | 2001 | $0 | $0 | 2025-07 |
| The Federated Garden Clubs of Iowa Inc | Decorah | 501(c)(3) | 2001 | $0 | $0 | 2025-07 |
| The Federated Garden Clubs of Iowa Inc | Tipton | 501(c)(3) | 2001 | $0 | $0 | 2026-07 |
| The Federated Garden Clubs of Iowa Inc | Kensett | 501(c)(3) | 2001 | $0 | $0 | 2025-07 |
| The Federated Garden Clubs of Iowa Inc | Le Mars | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| The Federated Garden Clubs of Iowa Inc | Northwood | 501(c)(3) | 2001 | $0 | $0 | 2024-07 |
| The Federated Garden Clubs of Iowa Inc | Norwalk | 501(c)(3) | 2001 | $0 | $0 | 2026-07 |
| The Federated Garden Clubs of Iowa Inc | Afton | 501(c)(3) | 2001 | $0 | $0 | 2025-07 |
| The Federated Garden Clubs of Iowa Inc | Keosauqua | 501(c)(3) | 2001 | $0 | $0 | 2023-07 |
| The Federated Garden Clubs of Iowa Inc | Baxter | 501(c)(3) | 2001 | $0 | $0 | 2025-07 |
| The Foundation of Environmental Improvement | Fairfield | 501(c)(3) | 2006 | |||
| The Lobe Rangers | Bode | 501(c)(4) | 2026 | |||
| The Osage Conservation Club | Osage | 501(c)(3) | 2026 | |||
| Thriftology | Sioux City | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Through the Lens | Council BLFS | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Tree Des Moines Inc | Des Moines | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Tri Rivers Conservation Foundation | Wapello | 501(c)(3) | 1992 | $0 | $0 | 2025-12 |
| Tri-State Public Range Association | Sioux City | 501(c)(3) | 2016 | $0 | $0 | 2024-12 |
| Turkey River Sportsmen | MC Gregor | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Twin Lakes Restoration Foundation | Fort Dodge | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Upper Iowa River Alliance | Decorah | 501(c)(3) | 2016 | $0 | $0 | 2024-09 |
| Urban Ambassadors | Des Moines | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Vander Veer Botanical Society | Des Moines | 501(c)(3) | 2026 | |||
| Wapello Heritage Foundation Inc | Bloomfield | 501(c)(3) | 2006 | $0 | $0 | 2025-03 |
| Wapsi Bottom Sports Club | Oxford JCT | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Wapsipinicon Snow Mobile Association Inc | Independence | 501(c)(3) | 1997 | $0 | $0 | 2025-06 |
| Wayne County Conservation Boosters Inc | Corydon | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Wayne County Conservation Foundation | Allerton | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| West Tarkio Watershed and Lake Alliance Inc | Shenandoah | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Wings2water | Cedar Rapids | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Winneshiek Conservation Foundation | Fort Atkinson | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Worthington Sportsmens Club Incorporated | Worthington | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Wright Service Corp Foundation for Sustainability and Innovation | WDM | 501(c)(3) | 2020 | $45,861 | 2025-12 | |
| Young Minds Mission Foundation | WDM | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Zoo Garden at Weed Park | Muscatine | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Appanoose Conservation Foundation | Centerville | 501(c)(3) | 1994 | $-22,990 | $730,831 | 2025-06 |
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.