Organizations
Largest first
By revenue on the last return. Organizations that file Form 990-N report no figures and come last.
| Organization | Return | Revenue |
|---|---|---|
| Institute for Energy ResearchWashington | Form 990 | $2,547,113FY2025 |
| Water Finance Exchange IncWashington | Form 990 | $2,494,348FY2025 |
| Ridgeline Center for Law and PolicyWashington | Form 990 | $2,429,939FY2024 |
| Alliance for Just Deliberation on Solar Geoengineering IncWashington | Form 990 | $2,408,500FY2025 |
| Americans for a Clean Energy GridWashington | Form 990 | $2,407,109FY2024 |
| Alliance to Save EnergyWashington | Form 990 | $2,316,913FY2024 |
| Clean Energy WorksWashington | Form 990 | $2,199,329FY2025 |
| Zero Emission Maritime Buyers AllianceWashington | Form 990 | $2,192,926FY2025 |
| Global Sustainable Tourism CouncilWashington | Form 990 | $2,157,834FY2025 |
| Scenic AmericaWashington | Form 990 | $2,110,833FY2025 |
| Island PressWashington | Form 990 | $2,063,339FY2025 |
| Outdoor AllianceWashington | Form 990 | $1,747,439FY2025 |
| The Us Climate Action NetworkWashington | Form 990 | $1,727,893FY2025 |
| Sustainable Harvest InternationalWashington | Form 990 | $1,577,109FY2025 |
| National Association of Clean Air AgenciesWashington | Form 990 | $1,527,531FY2025 |
| Solarapp FoundationWashington | Form 990 | $1,518,839FY2024 |
| Solar Electric Light FundWashington | Form 990 | $1,515,941FY2024 |
| Association of Clean Water AdministratorsWashington | Form 990 | $1,514,093FY2025 |
| Smart Surfaces CoalitionWashington | Form 990 | $1,497,137FY2025 |
| Antarctic and Southern Ocean CoalitionWashington | Form 990 | $1,467,790FY2025 |
| Conservative Climate Foundation IncWashington | Form 990 | $1,425,375FY2024 |
| Solar and Storage Industries InstituteWashington | Form 990 | $1,403,997FY2024 |
| National Association of Railroad PassengersWashington | Form 990 | $1,287,439FY2025 |
| E3G Third Generation Environmentalism IncWashington | Form 990 | $1,261,444FY2024 |
| Pinchot Institute for ConservationWashington | Form 990 | $1,235,280FY2024 |
| Beyond PesticidesWashington | Form 990 | $1,152,155FY2025 |
| Center for Progressive Reform IncWashington | Form 990 | $1,064,771FY2024 |
| Center for Clean Air PolicyWashington | Form 990 | $1,061,835FY2025 |
| The Organic Center IncWashington | Form 990 | $1,046,491FY2024 |
| American Common Ground Council IncWashington | Form 990 | $1,046,402FY2025 |
| National Bonsai Foundation IncorporatedWashington | Form 990 | $1,016,266FY2025 |
| Clean Energy for America Education FundWashington | Form 990 | $962,300FY2025 |
| Southern Group of Foresters IncWashington | Form 990 | $945,595FY2025 |
| Northeast-Midwest State Foresters AllianceWashington | Form 990 | $936,864FY2025 |
| Anacostia RiverkeeperWashington | Form 990 | $896,960FY2024 |
| Energy Innovation Reform ProjectWashington | Form 990 | $795,594FY2024 |
| Greater Washington Region Clean Cities CoalitionWashington | Form 990 | $795,069FY2025 |
| National Conservation FoundationWashington | Form 990 | $768,169FY2025 |
| Students for Carbon Dividends IncWashington | Form 990 | $766,105FY2024 |
| Openaq IncWashington | Form 990 | $747,665FY2025 |
| Tregaron ConservancyWashington | Form 990 | $731,708FY2025 |
| Green 2 0Washington | Form 990 | $666,949FY2025 |
| Dumbarton Oaks Park Conservancy IncWashington | Form 990 | $666,137FY2024 |
| Policy Action for a Clean Tomorrow IncWashington | Form 990 | $645,000FY2025 |
| Ward 8 Woods Conservancy IncWashington | Form 990 | $620,493FY2025 |
| Earth Conservation CorpsWashington | Form 990 | $599,671FY2025 |
| Center for Responsible TravelWashington | Form 990 | $585,466FY2022 |
| Next 100 SyndicateWashington | Form 990 | $570,781FY2025 |
| Foundation EarthWashington | Form 990 | $542,500FY2024 |
| Circular Action AllianceWashington | Form 990 | $537,186FY2024 |
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