Data / Nonprofits / Washington / Environment
Environment nonprofits in Washington: 905 registered with the IRS
905 environment nonprofits are registered with the IRS in Washington, 860 of them 501(c)(3) charities; the 337 that report revenue took in $437.7 million. The most are in Seattle (167), Olympia (39), Spokane (31). The largest by revenue: Nia Tero Foundation ($32.9 million), Columbia Land Trust ($13.8 million), Islandwood ($13.3 million).
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The 500 largest by revenue
| Organization | City | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Nia Tero Foundation | Seattle | 501(c)(3) | 2018 | $32.9 million | $80.6 million | 2024-12 |
| Columbia Land Trust | Vancouver | 501(c)(3) | 1998 | $13.8 million | $150.2 million | 2024-12 |
| Islandwood | Bainbridge Is | 501(c)(3) | 1999 | $13.3 million | $50.8 million | 2025-06 |
| Forterra NW | Seattle | 501(c)(3) | 1994 | $12.8 million | $45.5 million | 2024-12 |
| Breakthrough Energy Catalyst Foundation | Kirkland | 501(c)(3) | 2021 | $12.4 million | $380.6 million | 2024-12 |
| Great Peninsula Conservancy | Bremerton | 501(c)(3) | 2000 | $11 million | $39.1 million | 2024-12 |
| Grist Magazine Inc | Seattle | 501(c)(3) | 2003 | $10.4 million | $11.6 million | 2025-09 |
| Whidbey-Camano Land Trust | Greenbank | 501(c)(3) | 1985 | $8.6 million | $36.9 million | 2025-12 |
| Partners for Energy Progress | Olympia | 501(c)(4) | 2023 | $7.9 million | $0 | 2024-12 |
| The Mountaineers | Seattle | 501(c)(3) | 2011 | $7.9 million | $19.2 million | 2025-09 |
| Arboretum Foundation | Seattle | 501(c)(3) | 1937 | $7.9 million | $14.4 million | 2025-06 |
| Methow Salmon Recovery Foundation | Twisp | 501(c)(3) | 2001 | $6.9 million | $7.9 million | 2025-12 |
| The Mountains To Sound Greenway Trust | Seattle | 501(c)(3) | 1996 | $6.4 million | $6.3 million | 2025-06 |
| Splash International | Seattle | 501(c)(3) | 2006 | $5.8 million | $4.9 million | 2025-12 |
| Bainbridge Island Land Trust | Bainbridge Is | 501(c)(3) | 1994 | $5.8 million | $25.1 million | 2025-12 |
| Marine Stewardship Council Limited | Tukwila | 501(c)(3) | 2001 | $5.7 million | $577,091 | 2025-03 |
| Ecostudies Institute | Olympia | 501(c)(3) | 2001 | $5.3 million | $2.1 million | 2024-12 |
| Washington Conservation Action Education Fund | Seattle | 501(c)(3) | 1986 | $5.1 million | $9 million | 2024-12 |
| Delridge Neighborhoods Development Association | Seattle | 501(c)(3) | 1996 | $5 million | $26.7 million | 2024-12 |
| Washington Maritime Blue | Seattle | 501(c)(3) | 2020 | $4.8 million | $1.6 million | 2025-06 |
| Tilth Alliance | Seattle | 501(c)(3) | 1997 | $4.7 million | $1.2 million | 2024-12 |
| Breakthrough Energy Action Inc | Kirkland | 501(c)(4) | 2022 | $4.7 million | $24.5 million | 2024-12 |
| Chelan-Douglas Land Trust | Wenatchee | 501(c)(3) | 1986 | $4.7 million | $33.1 million | 2026-03 |
| Capitol Land Trust | Tumwater | 501(c)(3) | 1994 | $4.7 million | $30.6 million | 2025-12 |
| North Cascades Institute | Sedro Woolley | 501(c)(3) | 1986 | $4.6 million | $9.2 million | 2024-12 |
| Composite Recycling Technology Center | Port Angeles | 501(c)(3) | 2017 | $4.5 million | $5.6 million | 2025-12 |
| Sightline Institute | Seattle | 501(c)(3) | 1998 | $4.5 million | $8.1 million | 2025-12 |
| Conservation NW | Seattle | 501(c)(3) | 1989 | $4.2 million | $2 million | 2025-03 |
| Mt Adams Resource Stewards | Glenwood | 501(c)(3) | 2004 | $4.1 million | $6.3 million | 2025-06 |
| San Juan Preservation Trust | Friday Harbor | 501(c)(3) | 1979 | $3.9 million | $68.8 million | 2024-12 |
| Inland Northwest Land Trust | Spokane | 501(c)(3) | 1992 | $3.8 million | $19.3 million | 2024-12 |
| Ertv Compliance Group | Seattle | 501(c)(4) | 2011 | $3.7 million | $1 million | 2024-12 |
| Mid-Columbia Fisheries Enhancement Group | White Salmon | 501(c)(3) | 2003 | $3.7 million | $948,732 | 2025-06 |
| Utility Information Alliance | Seattle | 501(c)(3) | 2023 | $3.7 million | $1.3 million | 2025-12 |
| Clean and Prosperous America | Seattle | 501(c)(4) | 2025 | $3.6 million | $812,136 | 2025-12 |
| Nisqually Land Trust | Lacey | 501(c)(3) | 1990 | $3.6 million | $53.8 million | 2025-12 |
| Toxic-Free Future | Seattle | 501(c)(3) | 1984 | $3.6 million | $5.3 million | 2024-12 |
| Evergreen Mountain Bike Alliance | North Bend | 501(c)(3) | 2003 | $3.2 million | $2.5 million | 2024-12 |
| Back Country Horsemen of Washington | Ellensburg | 501(c)(3) | 2010 | $3.2 million | $988,826 | 2024-12 |
| Sustainable Connections | Bellingham | 501(c)(3) | 2003 | $3.1 million | $2.7 million | 2024-12 |
| Jefferson Land Trust | Port Townsend | 501(c)(3) | 1994 | $3 million | $21.5 million | 2024-12 |
| Rhododendron Species Foundation | Federal Way | 501(c)(3) | 1965 | $3 million | $11 million | 2024-12 |
| Skagit Land Trust | Mount Vernon | 501(c)(3) | 1996 | $3 million | $32.6 million | 2025-03 |
| Washington Farmland Trust | Seattle | 501(c)(3) | 2000 | $3 million | $10.3 million | 2024-12 |
| The Sustainable Living Center | Walla Walla | 501(c)(3) | 2004 | $3 million | $296,265 | 2025-12 |
| Feel Good Action | Seattle | 501(c)(3) | 2022 | $3 million | $1.1 million | 2024-12 |
| Building Transparency | Seattle | 501(c)(3) | 2020 | $3 million | $7,396 | 2024-12 |
| 350 Seattle | Seattle | 501(c)(3) | 2015 | $2.9 million | $1.5 million | 2024-12 |
| Birds Connect Seattle | Seattle | 501(c)(3) | 1978 | $2.9 million | $6.1 million | 2025-06 |
| Unkitawa | Kent | 501(c)(3) | 2018 | $2.8 million | $2.3 million | 2024-12 |
| Initiative for Responsible Mining Assurance | Seattle | 501(c)(3) | 2023 | $2.7 million | $4 million | 2024-12 |
| Duwamish River Cleanupcoalition-Technical Advisory Group | Seattle | 501(c)(3) | 2006 | $2.7 million | $5.5 million | 2024-12 |
| Leading Harvest | Seattle | 501(c)(3) | 2020 | $2.7 million | $4.3 million | 2024-12 |
| Washington Water Trust | Seattle | 501(c)(3) | 1999 | $2.6 million | $2.2 million | 2024-12 |
| Puget Sound Restoration Fund | Bainbridge Is | 501(c)(3) | 1997 | $2.6 million | $4.1 million | 2024-12 |
| Front and Centered | Seattle | 501(c)(3) | 2020 | $2.6 million | $2.6 million | 2023-12 |
| Carbon Leadership Forum | Bellevue | 501(c)(3) | 2024 | $2.5 million | $1.6 million | 2024-12 |
| Re Sources | Bellingham | 501(c)(3) | 1985 | $2.4 million | $2.4 million | 2025-12 |
| Vashon-Maury Island Land Trust | Vashon | 501(c)(3) | 1990 | $2.2 million | $8.4 million | 2025-12 |
| Whatcom Land Trust | Bellingham | 501(c)(3) | 1984 | $2.2 million | $33.6 million | 2025-06 |
| Methow Valley Sports Trails Association | Winthrop | 501(c)(3) | 2001 | $2.1 million | $5.3 million | 2026-05 |
| Environmental Coalition of South Seattle | Seattle | 501(c)(3) | 1994 | $1.9 million | $1.2 million | 2025-12 |
| Clean and Prosperous America Action | Seattle | 501(c)(4) | 2025 | $1.9 million | $1.5 million | 2025-12 |
| Northwest Watershed Institute | Port Townsend | 501(c)(3) | 2002 | $1.9 million | $3.4 million | 2025-06 |
| Ecoadapt | Bainbridge Is | 501(c)(3) | 2009 | $1.9 million | $2.2 million | 2024-12 |
| TFT | Seattle | 501(c)(3) | 2011 | $1.7 million | $90,340 | 2024-12 |
| Washington Resource Conservation and Development Council | Yakima | 501(c)(3) | 2001 | $1.7 million | $430,008 | 2024-12 |
| American Friends of Canadian Conservation | Bellingham | 501(c)(3) | 2007 | $1.7 million | $2.8 million | 2025-03 |
| Urban Forest Carbon Registry | Seattle | 501(c)(3) | 2016 | $1.7 million | $1.3 million | 2025-12 |
| Bellevue Botanical Garden Society | Bellevue | 501(c)(3) | 1992 | $1.7 million | $5.9 million | 2025-06 |
| Spark Northwest | Seattle | 501(c)(3) | 2002 | $1.6 million | $1.5 million | 2025-12 |
| Okanogan Land Trust | Okanogan | 501(c)(3) | 1991 | $1.6 million | $2.9 million | 2025-06 |
| Clean and Prosperous America Education Fund | Seattle | 501(c)(3) | 2023 | $1.5 million | $111,423 | 2025-12 |
| Fuse Washington | Seattle | 501(c)(4) | 2007 | $1.5 million | $298,522 | 2025-06 |
| Pipeline Safety Trust | Bellingham | 501(c)(3) | 2003 | $1.5 million | $5.8 million | 2025-03 |
| Sustainable Seattle | Seattle | 501(c)(3) | 1998 | $1.4 million | $2 million | 2024-12 |
| Earthgen | Seattle | 501(c)(3) | 2011 | $1.4 million | $853,269 | 2025-06 |
| Puget Soundkeeper Alliance | Seattle | 501(c)(3) | 1985 | $1.4 million | $1.2 million | 2025-12 |
| Olympia Coalition for Ecosystems Preservation | Olympia | 501(c)(3) | 2015 | $1.3 million | $6.1 million | 2025-12 |
| Garden Raised Bounty | Olympia | 501(c)(3) | 1993 | $1.3 million | $1.3 million | 2025-06 |
| Feiro Marine Life Center | Port Angeles | 501(c)(3) | 2008 | $1.3 million | $5.7 million | 2024-12 |
| Stewardship Partners | Seattle | 501(c)(3) | 1999 | $1.3 million | $2 million | 2025-12 |
| Earth Economics | Tacoma | 501(c)(3) | 2006 | $1.3 million | $993,317 | 2025-12 |
| Mount St Helens Institute | Amboy | 501(c)(3) | 1996 | $1.3 million | $674,604 | 2025-12 |
| Mini Mart City Park | Seattle | 501(c)(3) | 2014 | $1.3 million | $2.8 million | 2025-12 |
| Basel Action Network | Seattle | 501(c)(3) | 2009 | $1.2 million | $579,323 | 2024-12 |
| Fuse Innovation Fund | Seattle | 501(c)(3) | 2007 | $1.2 million | $398,595 | 2025-06 |
| Mangrove Action Project | Seattle | 501(c)(3) | 2006 | $1.2 million | $932,666 | 2024-12 |
| Nature Vision Inc | Woodinville | 501(c)(3) | 2003 | $1.1 million | $156,362 | 2026-06 |
| Northwest Natural Resource Group | Seattle | 501(c)(3) | 1993 | $1.1 million | $559,737 | 2025-12 |
| Pacific Northwest Pollution Control Association | Gig Harbor | 501(c)(3) | 1976 | $1.1 million | $833,822 | 2024-12 |
| Mt Adams Institute | Trout Lake | 501(c)(3) | 2012 | $1.1 million | $1.1 million | 2025-12 |
| Adopt-A-Stream Foundation | Everett | 501(c)(3) | 1986 | $1 million | $2 million | 2025-06 |
| Friends of Lakewood | Lakewood | 501(c)(3) | 1987 | $1 million | $4.8 million | 2024-12 |
| North Olympic Land Trust | Port Angeles | 501(c)(3) | 1991 | $1 million | $17.4 million | 2025-12 |
| Coastal and Estuarine Research Federation | Seattle | 501(c)(3) | 2009 | $982,659 | $1.9 million | 2024-12 |
| The Lands Council | Spokane | 501(c)(3) | 1989 | $969,376 | $256,071 | 2024-12 |
| Futurewise | Seattle | 501(c)(3) | 1995 | $967,110 | $764,571 | 2024-12 |
| Pacific Northwest Pollution Prevention Resource Center | Everett | 501(c)(3) | 1996 | $961,784 | $154,143 | 2025-12 |
| Phoenix Conservancy | Pullman | 501(c)(3) | 2016 | $940,331 | $150,040 | 2025-12 |
| Mason County Climate Justice | Shelton | 501(c)(3) | 2023 | $938,911 | $1.3 million | 2025-12 |
| Remember Land | Battle Ground | 501(c)(3) | 2020 | $933,180 | $6 million | 2025-12 |
| Environmental Science Center | Burien | 501(c)(3) | 2000 | $924,254 | $907,583 | 2025-06 |
| Cascade Forest Conservancy | Vancouver | 501(c)(3) | 1997 | $921,832 | $379,315 | 2024-12 |
| Burn Design Lab | Vashon | 501(c)(3) | 2011 | $919,856 | $1.4 million | 2025-12 |
| Center for Sustainable Infrastructure | Olympia | 501(c)(3) | 2019 | $862,394 | $401,666 | 2024-12 |
| Blue Mountain Land Trust | Walla Walla | 501(c)(3) | 2000 | $858,244 | $2 million | 2024-12 |
| Nisqually River Foundation | Olympia | 501(c)(3) | 2004 | $857,841 | $416,680 | 2024-12 |
| Sacred Earth Foundation | Goldendale | 501(c)(3) | 2010 | $855,826 | $3.7 million | 2024-12 |
| Historic Seattle Preservation FNDN | Seattle | 501(c)(3) | 1996 | $807,411 | $446,522 | 2025-12 |
| Clean Up the Cayes | Olympia | 501(c)(3) | 2018 | $801,514 | $701,549 | 2024-12 |
| Communities for A Healthy Bay | Tacoma | 501(c)(3) | 1993 | $801,286 | $281,798 | 2024-12 |
| Columbia Springs | Vancouver | 501(c)(3) | 2001 | $769,798 | $1 million | 2024-12 |
| Lower Columbia School Gardens | Longview | 501(c)(3) | 2014 | $761,571 | $308,272 | 2025-12 |
| Yakima Greenway Foundation | Yakima | 501(c)(3) | 1981 | $757,309 | $2.5 million | 2024-12 |
| Tetiaroa Society | Bellevue | 501(c)(3) | 2012 | $722,823 | $5 million | 2024-12 |
| National Association of Environmental Professionals Inc | Seattle | 501(c)(3) | 1977 | $713,186 | $1.1 million | 2025-12 |
| Tacoma Tree Foundation | Tacoma | 501(c)(3) | 2019 | $712,586 | $383,172 | 2025-12 |
| Department of Bioregion | Seattle | 501(c)(3) | 2025 | $695,862 | $419,065 | 2025-10 |
| Salish Sea School | Anacortes | 501(c)(3) | 2020 | $694,389 | $384,802 | 2025-12 |
| Our Hope | Seattle | 501(c)(3) | 2015 | $673,211 | $55,840 | 2024-12 |
| Tribal Solid Waste Advisory Network | Tekoa | 501(c)(3) | 2002 | $652,609 | $61,291 | 2025-09 |
| Center for Democratic and Environmental Rights | Spokane | 501(c)(3) | 2019 | $641,740 | $2.1 million | 2025-12 |
| Kubota Garden Foundation | Tukwila | 501(c)(3) | 1994 | $637,469 | $559,125 | 2024-12 |
| Wild Salmon Rivers | Edmonds | 501(c)(3) | 2005 | $608,006 | $848,724 | 2024-12 |
| Global Ocean Health | Seattle | 501(c)(3) | 1997 | $604,720 | $565,154 | 2026-03 |
| Washington Native Plant Society | Seattle | 501(c)(3) | 1976 | $603,232 | $1 million | 2024-12 |
| Smart Buildings Center Education Program | Seattle | 501(c)(3) | 2017 | $600,251 | $481,770 | 2025-12 |
| Dishman Hills Conservancy | Spokane | 501(c)(3) | 1968 | $598,341 | $3.5 million | 2025-12 |
| Foundation for Glacier & Environmental Research | Seattle | 501(c)(3) | 2013 | $597,218 | $390,445 | 2024-12 |
| Meerkerk Rhododendron Gardens | Greenbank | 501(c)(3) | 2003 | $590,726 | $2.2 million | 2025-12 |
| Salmon Defense | Olympia | 501(c)(3) | 2004 | $589,822 | $667,585 | 2024-12 |
| Nisqually Community Forest | Olympia | 501(c)(3) | 2015 | $584,129 | $14 million | 2024-12 |
| Canopy Planet Foundation | Blaine | 501(c)(3) | 2022 | $576,055 | $5.8 million | 2025-03 |
| Yakima Area Arboretum A Nonprofit Corporation | Yakima | 501(c)(3) | 1967 | $571,643 | $1.1 million | 2024-12 |
| Pacific Rim Institute for Environmental Stewardship | Coupeville | 501(c)(3) | 2010 | $531,618 | $431,850 | 2023-12 |
| Skyriver Foundation | Kirkland | 501(c)(3) | 2023 | $517,012 | $894,500 | 2025-12 |
| American Lands Project | Seattle | 501(c)(3) | 2020 | $513,418 | $319,478 | 2024-12 |
| Hanford Challenge | Seattle | 501(c)(3) | 2008 | $510,900 | $428,228 | 2024-12 |
| Dungeness River Nature Center | Sequim | 501(c)(3) | 1995 | $504,755 | $6.8 million | 2024-12 |
| No Olympic Peninsula Resource Consrvation & Development Council | Port Angeles | 501(c)(3) | 2002 | $503,896 | $102,654 | 2024-12 |
| Braided River | Seattle | 501(c)(3) | 2008 | $502,166 | $479,971 | 2025-09 |
| Lummi Island Heritage Trust | Lummi Island | 501(c)(3) | 1998 | $500,694 | $11 million | 2024-12 |
| South Sound Estuary Association | Olympia | 501(c)(3) | 2011 | $474,642 | $123,808 | 2025-12 |
| Foothills Rails To Trails Coalition | Puyallup | 501(c)(3) | 1987 | $454,558 | $580,205 | 2025-12 |
| Harbor Wildwatch | Gig Harbor | 501(c)(3) | 2006 | $440,267 | $200,446 | 2024-12 |
| Eastrail Partners | Woodinville | 501(c)(3) | 2021 | $431,272 | $535,915 | 2025-12 |
| Vashon-Maury Island Nature Center | Vashon | 501(c)(3) | 2018 | $430,163 | $607,206 | 2025-12 |
| Spokane Riverkeeper | Spokane | 501(c)(3) | 2020 | $419,002 | $442,441 | 2024-12 |
| Pacific Coast Salmon Coalition | Forks | 501(c)(3) | 2016 | $411,020 | $84,004 | 2025-12 |
| Waste Loop | Leavenworth | 501(c)(3) | 2019 | $409,045 | $93,894 | 2024-12 |
| Whidbey Environmental Action Network | Langley | 501(c)(3) | 1995 | $407,869 | $315,622 | 2025-12 |
| Friends of the Anacortes Community Forest Lands | Anacortes | 501(c)(3) | 1996 | $397,831 | $677,839 | 2024-12 |
| Friends of Hoja Nueva | Bainbridge Is | 501(c)(3) | 2015 | $393,909 | $2.5 million | 2026-03 |
| Seattle Reconomy | Seattle | 501(c)(3) | 2014 | $384,298 | $159,253 | 2024-12 |
| Climate Collaborative | Bellingham | 501(c)(3) | 2021 | $378,379 | $176,480 | 2024-12 |
| Nimiipuu Protecting the Environment | Pullman | 501(c)(3) | 2015 | $378,048 | $1.2 million | 2025-12 |
| Carrolls Water Association | Carrolls | 501(c)(12) | 2018 | $366,503 | $720,306 | 2025-12 |
| Methow Valley Trails Collaborative | Winthrop | 501(c)(3) | 2023 | $364,949 | $124,516 | 2025-12 |
| Skagit Watershed Council | Mount Vernon | 501(c)(3) | 1999 | $363,757 | $271,275 | 2025-06 |
| Got Green | Seattle | 501(c)(3) | 1995 | $354,188 | $2.2 million | 2024-12 |
| Coast Salish Youth Coaliton | Anacortes | 501(c)(3) | 2024 | $347,540 | $341,328 | 2024-12 |
| Olympia Community Solar | Olympia | 501(c)(3) | 2019 | $342,214 | $420,541 | 2025-12 |
| Reflective Earth Foundation | Mercer Island | 501(c)(3) | 2019 | $329,766 | $204,172 | 2025-12 |
| Legacy Forest Defense Coalition | Tacoma | 501(c)(3) | 2023 | $322,245 | $152,227 | 2024-12 |
| Net-Negative Co2 Baseload Power Inc | West Richland | 501(c)(6) | 2023 | $320,000 | $173,771 | 2024-12 |
| Braided Seeds | Tukwila | 501(c)(3) | 2021 | $312,734 | $81,098 | 2025-12 |
| Cedarroot | Nordland | 501(c)(3) | 2014 | $311,538 | $150,748 | 2025-12 |
| Save Habitat and Diversity of Wetlands Organization | Renton | 501(c)(3) | 2000 | $311,391 | $943,297 | 2024-12 |
| Chay Environmental | Kelso | 501(c)(3) | 2015 | $307,773 | $19,229 | 2023-12 |
| Professional Training Association | Shelton | 501(c)(3) | 2019 | $302,967 | $53,776 | 2024-12 |
| Sustainable Renton | Renton | 501(c)(3) | 2011 | $301,034 | $245,099 | 2025-12 |
| Methow Recycles | Twisp | 501(c)(3) | 2003 | $299,409 | $209,054 | 2025-12 |
| Northeast Washington Forestry Coalition | Colville | 501(c)(3) | 2004 | $298,172 | $42,766 | 2025-12 |
| Wa-Ya Outdoor Institute | Tumwater | 501(c)(3) | 2017 | $294,505 | $64,303 | 2024-12 |
| Far Reaches Botanical Conservancy | Port Townsend | 501(c)(3) | 2017 | $291,303 | $277,464 | 2024-12 |
| Olympic Nature Experience | Carlsborg | 501(c)(3) | 2015 | $273,072 | $186,991 | 2025-12 |
| Salish Center for Sustainable Fishing Methods | Lummi Island | 501(c)(3) | 2018 | $267,413 | $1 million | 2024-12 |
| Hulda Klager Lilac Gardens | Woodland | 501(c)(3) | 1976 | $266,161 | $1.1 million | 2024-12 |
| Sound Water Stewards of Island County | Freeland | 501(c)(3) | 2016 | $263,354 | $186,845 | 2025-12 |
| Wild Forests and Fauna | Carnation | 501(c)(3) | 2014 | $255,856 | $353,578 | 2025-12 |
| Sustainable NCW | Wenatchee | 501(c)(3) | 2018 | $245,496 | $63,348 | 2025-12 |
| Washington Chapter of the Foundation for North Am Wild Sheep | Kent | 501(c)(3) | 1993 | $243,282 | $812,437 | 2025-06 |
| Thurston Climate Action Team | Olympia | 501(c)(3) | 2010 | $242,480 | $100,441 | 2025-12 |
| Whiteswan Environmental We | Bellingham | 501(c)(3) | 2018 | $239,641 | $498,524 | 2025-12 |
| Soapbox Project | Seattle | 501(c)(3) | 2024 | $231,842 | $62,838 | 2025-12 |
| Deschutes Estuary Restoration Team | Olympia | 501(c)(3) | 2011 | $229,379 | $93,714 | 2024-12 |
| Northwest Horticultural Society | Seattle | 501(c)(3) | 1966 | $226,326 | $341,267 | 2024-12 |
| The Parks and Recreation Foundation of Vancouver and Clark County | Vancouver | 501(c)(3) | 2000 | $218,586 | $1.6 million | 2024-12 |
| Friends of the Farms | Bainbridge Is | 501(c)(3) | 2001 | $218,213 | $663,909 | 2025-12 |
| Clean Water for Haiti | Vancouver | 501(c)(3) | 2005 | $215,142 | $1,718 | 2024-12 |
| Kittitas Environmental Education Network | Ellensburg | 501(c)(3) | 2002 | $213,581 | $107,318 | 2024-12 |
| Spokane River Forum | Spokane | 501(c)(3) | 2009 | $208,638 | $124,335 | 2025-06 |
| Tahoma Audubon Society | University PL | 501(c)(3) | 1975 | $199,700 | $89,861 | 2025-12 |
| Kruckeberg Botanic Garden Foundation | Shoreline | 501(c)(3) | 1999 | $194,298 | $366,280 | 2024-12 |
| Community Nature Foundation | Olympia | 501(c)(3) | 2022 | $193,007 | $511,538 | 2026-01 |
| Washington Mass Timber Alliance | Seattle | 501(c)(3) | 2025 | $188,577 | $19,305 | 2025-12 |
| Center for Sustainable Economy | Port Townsend | 501(c)(3) | 2004 | $187,613 | $526,084 | 2025-12 |
| Agroforestry Northwest | Bothell | 501(c)(3) | 2023 | $185,065 | $161,022 | 2025-12 |
| Remakery | Tacoma | 501(c)(3) | 2023 | $183,594 | $51,287 | 2025-12 |
| Clean Washington Waters | Seattle | 501(c)(3) | 2019 | $182,069 | $203,295 | 2025-12 |
| Barnacles and Bees | Bremerton | 501(c)(3) | 2019 | $181,733 | $77,374 | 2025-06 |
| Pacific Sound Resources Environment | Olympia | 501(c)(3) | 1995 | $172,368 | $5.1 million | 2025-12 |
| Methow Field Institute | Twisp | 501(c)(3) | 1995 | $167,467 | $413,165 | 2025-12 |
| Spokane Mountaineers Inc | Spokane | 501(c)(3) | 2020 | $166,426 | $666,944 | 2025-12 |
| Sahale Outdoors | Fife | 501(c)(3) | 2022 | $161,773 | $32,918 | 2025-12 |
| Center for Sustainability & Working Rivers | Colfax | 501(c)(3) | 2024 | $158,250 | $81,905 | 2025-12 |
| Center for Responsible Forestry | Quilcene | 501(c)(3) | 2021 | $154,452 | $226,085 | 2025-12 |
| Terra-Forma | Olympia | 501(c)(3) | 2003 | $152,534 | $30,620 | 2025-12 |
| On Sacred Ground | Friday Harbor | 501(c)(3) | 2014 | $151,769 | $6,720 | 2024-12 |
| International Oak Society | Mercer Island | 501(c)(3) | 1997 | $151,663 | $269,552 | 2024-12 |
| Belltown United | Seattle | 501(c)(3) | 2025 | $150,192 | $30,943 | 2025-12 |
| Highline Botanical Garden Foundation | Seatac | 501(c)(3) | 1998 | $148,049 | $239,852 | 2024-12 |
| Puyallup River Watershed Council | Tacoma | 501(c)(3) | 2000 | $147,839 | $57,938 | 2024-12 |
| Friends of Badger Mountain | Richland | 501(c)(3) | 2006 | $147,703 | $1.9 million | 2024-12 |
| Center for Environmental Law & Policy | Seattle | 501(c)(3) | 1996 | $147,671 | $254,525 | 2024-12 |
| Gesneriad Society | Seattle | 501(c)(3) | 1986 | $147,548 | $1.1 million | 2025-12 |
| Yakima Arboretum Foundation | Yakima | 501(c)(3) | 2019 | $146,870 | $2.2 million | 2024-12 |
| Native Plant Salvage Foundation | Olympia | 501(c)(3) | 2001 | $145,595 | $238,753 | 2024-12 |
| Spokane Zero Waste | Spokane | 501(c)(3) | 2023 | $144,834 | $48,299 | 2025-12 |
| Friends of the Salish Sea | Anacortes | 501(c)(3) | 2009 | $144,740 | $108,102 | 2025-12 |
| Sustainable Ballard | Seattle | 501(c)(3) | 2019 | $144,144 | $52,862 | 2025-12 |
| Twin Harbors Waterkeeper | Rochester | 501(c)(3) | 2019 | $139,716 | $140,571 | 2025-12 |
| Sound Data Science A Nonprofit Corporation | Seattle | 501(c)(3) | 2024 | $139,540 | $22,500 | 2025-12 |
| Friends of the Conservatory | Seattle | 501(c)(3) | 1980 | $138,983 | $104,512 | 2025-12 |
| Bronze Chapter | Bow | 501(c)(3) | 2022 | $138,958 | $64,005 | 2024-12 |
| Master Gardener Foundation of Washington State | Yakima | 501(c)(3) | 1993 | $137,671 | $178,096 | 2025-12 |
| Citizens of the Ebeys Reserve for A Healthy SAFE&PEACEFUL Environment | Coupeville | 501(c)(4) | 2015 | $137,300 | $108,798 | 2025-12 |
| Propagationnation | University PL | 501(c)(3) | 2019 | $136,129 | $74,196 | 2025-12 |
| Northwest Perennial Alliance | Bellevue | 501(c)(3) | 2004 | $135,411 | $397,011 | 2024-12 |
| Kulshan Carbon Trust | Bellingham | 501(c)(3) | 2022 | $134,418 | $23,462 | 2024-12 |
| Green Okanogan | Tonasket | 501(c)(3) | 2014 | $134,122 | $375,259 | 2025-12 |
| Indigenous Just Transition | Seattle | 501(c)(3) | 2024 | $133,434 | $109,316 | 2025-12 |
| Upper Columbia Resource Conservation & Development Council | Spokane Vly | 501(c)(3) | 1994 | $132,991 | $185,401 | 2024-12 |
| Seattle Garden Club | Seattle | 501(c)(3) | 1995 | $131,342 | $647,032 | 2025-05 |
| Farmore Wa | Seattle | 501(c)(3) | 2018 | $127,160 | $170,296 | 2025-12 |
| Friends of Fort Flagler State Park | Nordland | 501(c)(3) | 2003 | $126,567 | $104,702 | 2025-12 |
| 350 Tacoma | Tacoma | 501(c)(3) | 2018 | $125,686 | $44,205 | 2025-12 |
| Shine Foundation | Bellevue | 501(c)(3) | 2024 | $125,000 | $774,746 | 2025-12 |
| Master Gardener Foundation of King County | Renton | 501(c)(3) | 1985 | $124,486 | $699,126 | 2025-12 |
| Pinchot Partners | Morton | 501(c)(3) | 2023 | $123,614 | $66,923 | 2025-06 |
| Rhody Ridge Foundation | Bothell | 501(c)(3) | 2015 | $121,919 | $207,247 | 2026-03 |
| Loon Lake Land Conservancy | Loon Lake | 501(c)(3) | 2002 | $121,839 | $891,448 | 2024-12 |
| Khimstonik | Toppenish | 501(c)(3) | 2022 | $118,582 | $2,492 | 2025-12 |
| Eastside Audubon Society | Redmond | 501(c)(3) | 1981 | $118,533 | $421,203 | 2025-12 |
| Northwest Community Land Trust Coalition | Winthrop | 501(c)(3) | 2005 | $118,153 | $142,864 | 2024-12 |
| Sound Action | Vashon | 501(c)(3) | 1999 | $117,719 | $78,233 | 2024-12 |
| L I G H T Foundation | Elmer City | 501(c)(3) | 2022 | $116,766 | $489,717 | 2025-12 |
| Forevergreen Trails | Tacoma | 501(c)(3) | 2017 | $115,573 | $86,108 | 2025-12 |
| Clark Skamania Flyfishers | Vancouver | 501(c)(3) | 1998 | $115,044 | $153,068 | 2025-12 |
| Northwest Regional Floodplain Management Association | Ellensburg | 501(c)(3) | 2001 | $111,947 | $163,217 | 2025-12 |
| The English Springer Spaniel Field Trial Association Foundation Inc | Seattle | 501(c)(3) | 1995 | $110,793 | $1 million | 2024-12 |
| Whatcom Million Trees Project | Bellingham | 501(c)(3) | 2021 | $110,515 | $245,899 | 2025-12 |
| Kitsap Environmental Coalition | Indianola | 501(c)(3) | 2018 | $110,319 | $1 | 2025-12 |
| Earthviews Conservation Society | Tacoma | 501(c)(3) | 2023 | $105,719 | $27,383 | 2025-12 |
| Clean Drinking Water Project | Yakima | 501(c)(3) | 2023 | $104,558 | $349,545 | 2025-12 |
| Lighthouse Environmental Programs | Coupeville | 501(c)(3) | 1995 | $103,705 | $528,328 | 2025-12 |
| Master Gardener Foundation of Spokane County | Spokane | 501(c)(3) | 2013 | $101,520 | $195,768 | 2024-12 |
| Makesoil | Tacoma | 501(c)(3) | 2019 | $95,036 | $26,897 | 2025-12 |
| 2030 Districts Network | Seattle | 501(c)(3) | 2016 | $94,246 | $7,630 | 2024-12 |
| Pedal Project | Bellingham | 501(c)(3) | 1998 | $92,822 | $211,534 | 2025-12 |
| Pacific Northwest International Section Air Pollution Control Asso | Bellevue | 501(c)(3) | 1983 | $92,015 | $250,096 | 2025-04 |
| Washington State Environmental Health Association | South Bend | 501(c)(3) | 1986 | $91,537 | $323,089 | 2025-12 |
| Kooskooskie Commons | Walla Walla | 501(c)(3) | 1999 | $90,931 | $11,711 | 2025-08 |
| Ifta Research Foundation | Kenneiwck | 501(c)(3) | 2014 | $89,342 | $1 million | 2025-11 |
| Cowlitz Valley Wildlife League | Silverlake | 501(c)(4) | 2016 | $86,696 | $58,348 | 2024-12 |
| Pilchuck Audubon Society | Snohomish | 501(c)(3) | 1979 | $86,669 | $642,063 | 2024-12 |
| Evergreen Arboretum and Gardens | Everett | 501(c)(3) | 2007 | $86,441 | $161,999 | 2025-12 |
| Master Gardener Foundation of Thurston County | Olympia | 501(c)(3) | 1998 | $85,198 | $240,947 | 2025-12 |
| Master Gardener Foundation of Kitsap County | Silverdale | 501(c)(3) | 1987 | $84,954 | $157,307 | 2025-12 |
| Native Habitat A Nonprofit Corporation | Seattle | 501(c)(3) | 2016 | $83,422 | $23,893 | 2025-12 |
| Cheh River Basin Land Trust | Centralia | 501(c)(3) | 1995 | $81,788 | $2.5 million | 2024-12 |
| Grays Harbor Audubon Society | Montesano | 501(c)(3) | 1994 | $78,028 | $5.8 million | 2024-12 |
| Mead SPL Site Custodial Trust | Olympia | 501(c)(3) | 2016 | $76,260 | $2.6 million | 2025-12 |
| Skagit County Master Gardener Foundation | Burlington | 501(c)(3) | 1996 | $75,652 | $85,639 | 2024-12 |
| Old Bellevue Merchants Association | Bellevue | 501(c)(3) | 2025 | $75,516 | $8,460 | 2025-12 |
| Kitsap Audubon Society | Poulsbo | 501(c)(3) | 1995 | $74,580 | $482,498 | 2025-06 |
| Kettle Range Conservation Group | Republic | 501(c)(3) | 1996 | $72,885 | $64,738 | 2025-12 |
| B & L Woodwaste Custodial Trust | Olympia | 501(c)(3) | 2016 | $71,465 | $2.9 million | 2025-12 |
| Wilderness Northwest | Brinnon | 501(c)(3) | 1986 | $71,108 | $163,241 | 2025-12 |
| Washington Prescribed Fire Council | Cle Elum | 501(c)(3) | 2023 | $70,542 | $22,936 | 2025-12 |
| Friends of Campbell Lake | Anacortes | 501(c)(3) | 2025 | $70,247 | $5,641 | 2025-12 |
| Killer Whale Tales | Seattle | 501(c)(3) | 2004 | $70,098 | $25,019 | 2025-06 |
| Solar Washington Association | Seattle | 501(c)(3) | 2002 | $68,854 | $63,455 | 2025-12 |
| Northwest Ecobuilding Guild | Seattle | 501(c)(3) | 1996 | $68,597 | $6,629 | 2025-12 |
| Friends of Lime Kiln Society | Friday Harbor | 501(c)(3) | 2015 | $68,400 | $104,010 | 2025-12 |
| Tacoma Garden Club | University PL | 501(c)(3) | 1991 | $68,322 | $601,367 | 2026-06 |
| Methow Watershed Foundation | Twisp | 501(c)(3) | 2015 | $67,171 | $4,998 | 2025-12 |
| Washington Water Trails Association | Seattle | 501(c)(3) | 1992 | $64,832 | $38,341 | 2024-12 |
| Jane Weber Evergreen Arboretum | Vancouver | 501(c)(3) | 2014 | $61,231 | $3 million | 2024-12 |
| Biodiversa Foundation | Tacoma | 501(c)(3) | 2021 | $60,004 | $60,329 | 2024-12 |
| Northwest Sportsmans Club | Greenacres | 501(c)(3) | 2010 | $58,256 | $137,185 | 2025-12 |
| Master Gardener Foundation of Clallam County | Sequim | 501(c)(3) | 1997 | $58,173 | $227,067 | 2025-12 |
| Master Gardener Foundation of Whatcom County | Bellingham | 501(c)(3) | 1998 | $57,578 | $165,293 | 2024-12 |
| Northwest Motorcycle Association Foundation | Mossyrock | 501(c)(3) | 2022 | $55,976 | $55,939 | 2024-12 |
| Tri-Cities Cares | Kennewick | 501(c)(3) | 2022 | $55,840 | $41,091 | 2025-12 |
| Heartfield Learning Collective | Greenbank | 501(c)(3) | 2023 | $53,608 | $10,142 | 2025-12 |
| Master Gardener Foundation of Chelan -Douglas Counties | Wenatchee | 501(c)(3) | 2001 | $53,497 | $85,651 | 2025-12 |
| Seres Global | Spokane | 501(c)(3) | 2014 | $53,168 | $158,485 | 2025-12 |
| Coastal Watershed Institute | Port Angeles | 501(c)(3) | 2011 | $52,604 | $2.7 million | 2025-06 |
| Sound Defense Alliance | Coupeville | 501(c)(3) | 2020 | $50,743 | $11,272 | 2024-12 |
| Allyn Community Association | Allyn | 501(c)(3) | 1999 | $50,679 | $6,512 | 2024-12 |
| Ground2ground Glass | Walla Walla | 501(c)(3) | 2023 | $48,889 | $86,125 | 2025-12 |
| Partnerships for Nature | Bainbridge Is | 501(c)(3) | 2020 | $48,738 | $53,198 | 2025-12 |
| Master Gardener Foundation of Yakima County | Yakima | 501(c)(3) | 2003 | $45,149 | $336,738 | 2025-12 |
| Olympic-Kitsap Peninsula Equestrian Teams Booster Club | Poulsbo | 501(c)(3) | 2019 | $44,162 | $3,190 | 2025-06 |
| Naturescaping | Brush Prairie | 501(c)(3) | 1997 | $43,751 | $134,432 | 2025-12 |
| Nature Immersion Program | Okanogan | 501(c)(3) | 2025 | $42,695 | $17,651 | 2025-12 |
| Northwest Orchid Society Inc | Seattle | 501(c)(3) | 2011 | $35,890 | $89,160 | 2024-12 |
| Weed Warriors | Renton | 501(c)(3) | 2014 | $34,654 | $91,116 | 2025-12 |
| Washington State Lake Protection Association | Seattle | 501(c)(3) | 1998 | $34,167 | $36,390 | 2025-12 |
| Woodinville Garden Club | Woodinville | 501(c)(3) | 2001 | $32,752 | $68,505 | 2025-07 |
| Back Country Horsemen of Idaho Inc | Pomeroy | 501(c)(4) | 2017 | $29,504 | $100,174 | 2026-02 |
| Longbranch Foundation | Lakebay | 501(c)(3) | 2016 | $27,716 | $224,844 | 2024-12 |
| Island County Master Gardeners | Coupeville | 501(c)(3) | 2008 | $27,520 | $62,368 | 2025-12 |
| Mount Vernon Parks Foundation | Mount Vernon | 501(c)(3) | 2010 | $27,357 | $74,724 | 2024-12 |
| Friends of North Creek Forest | Seattle | 501(c)(3) | 2013 | $26,512 | $42,607 | 2025-12 |
| Princess Louisa International Foundation | Bellevue | 501(c)(3) | 1999 | $26,053 | $885,221 | 2025-12 |
| Earth Givers Inc | Olympia | 501(c)(3) | 2008 | $25,063 | $73,207 | 2024-12 |
| Friends of Grays Harbor | Westport | 501(c)(3) | 1999 | $22,683 | $88,844 | 2025-12 |
| Schmitz Park Restore | Seattle | 501(c)(3) | 2025 | $21,323 | $21,293 | 2025-12 |
| Clark County Farm Foresty Assoc | Battle Ground | 501(c)(3) | 2000 | $14,365 | $117,997 | 2025-12 |
| Chewelah Valley Land Trust | Chewelah | 501(c)(3) | 2018 | $12,963 | $944,095 | 2025-12 |
| Sno-King Watershed Council | Kenmore | 501(c)(3) | 2015 | $9,045 | $14,476 | 2025-12 |
| Elkton Reserve Land Trust | Port Townsend | 501(c)(3) | 2015 | $8,954 | $141,169 | 2025-12 |
| NTD Public TV Seattle | Bellevue | 501(c)(3) | 2007 | $7,434 | $3,129 | 2025-12 |
| Cascade Backcountry Alliance | Seattle | 501(c)(3) | 2024 | $6,933 | $45,372 | 2025-09 |
| Just Transition Voters | Seattle | 501(c)(4) | 2024 | $6,843 | $125,418 | 2023-12 |
| Rbaw Marine Parks Conservancy | Seattle | 501(c)(3) | 2020 | $5,504 | $2,419 | 2025-12 |
| Save Our Fish Chapter-Puget Sound Anglers | Aberdeen | 501(c)(3) | 2006 | $3,981 | $15,496 | 2025-12 |
| Trashmob | Issaquah | 501(c)(3) | 2022 | $2,551 | $21,097 | 2024-12 |
| A Tree On Morris St | La Conner | 501(c)(3) | 2024 | $2,025 | $2,025 | 2025-07 |
| The Pacific Watershed Institute | Olympia | 501(c)(3) | 1993 | $1,199 | $62,948 | 2024-12 |
| New Enchantment Association for the Preservation of Nature | Lake Stevens | 501(c)(3) | 1999 | $692 | $7,980 | 2025-12 |
| The River Walkers Foundation | Olympia | 501(c)(3) | 2022 | $166 | $16,072 | 2024-12 |
| Gardeners of Cheney | Cheney | 501(c)(3) | 2010 | $61 | $640 | 2025-12 |
| Nature 4 All | Maple Valley | 501(c)(3) | 2017 | $3 | $2,080 | 2024-12 |
| 300 Trees | Bellevue | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| 350 Eastside | Sammamish | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| 350 Spokane | Spokane | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| 4727 Community Cleanup | Shoreline | 501(c)(3) | 2021 | |||
| 911 Glass Rescue | Chelan | 501(c)(3) | 2022 | $0 | $48,473 | 2025-12 |
| A Wisdom Keepers Delegation | Spokane | 501(c)(3) | 2025 | |||
| Abueno Tierra Foundation | Vancouver | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Acme Coyote | Acme | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Acorn for Tomorrow | Vashon | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Admiral Water Users Association | Moses Lake | 501(c)(12) | 2020 | $0 | $0 | 2026-06 |
| Advisory Council | Vancouver | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Ag Water Board of Whatcom County | Lynden | 501(c)(3) | 2017 | |||
| Aipe-Academy Foundation and Trust | Lacey | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Air and Waste Management Association - Puget Sound Chapter | Seattle | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Albers Vista Gardens Foundation of Kit Sap | Bremerton | 501(c)(3) | 2008 | $1.4 million | 2025-12 | |
| Alderwood Garden Club | Lynnwood | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| Alger Improvement Club | Burlington | 501(c)(4) | 1982 | $0 | $0 | 2025-10 |
| Alpine Conservancy | Anacortes | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Alpine Lakes Foundation | Seattle | 501(c)(3) | 1994 | $0 | $0 | 2024-12 |
| Alpine Lakes Protection Society | Seattle | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| American Lake Improvement Club | Lakewood | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| American Penstemon Society | Goldendale | 501(c)(3) | 2014 | $0 | $0 | 2025-09 |
| Anthill Creations Inc | Seattle | 501(c)(3) | 2024 | $0 | $0 | 2023-12 |
| Anua | Sammamish | 501(c)(3) | 2026 | |||
| Aquascan Coastal Technologies | Ocean Park | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Ardhi Yetu | Seattle | 501(c)(3) | 2024 | |||
| Arlington Garden Club | Arlington | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| Asian Research Institute for Environmental Law | Seattle | 501(c)(3) | 2026 | |||
| Associated Garden Clubs of Spokane | Spokane | 501(c)(3) | 2000 | $0 | $0 | 2025-09 |
| Association for Washington Archaeology | Seattle | 501(c)(3) | 1998 | $0 | $0 | 2026-03 |
| Association of Environmental Health Academic Programs | Issaquah | 501(c)(3) | 2004 | $0 | $0 | 2023-12 |
| Backyard Stewards Initiative | Newman Lake | 501(c)(3) | 2026 | |||
| Bainbridge Conservation Coalition | Bainbridge Island | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Beach and Sea Ocean Plastic Recovery and Recycling | Colville | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Beautify Bonney Lake | Bonney Lake | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Become A Tree Burial | Port Angeles | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Bee Inspired Garden and Community Forest | Onalaska | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Bellingham Land Trust Inc | Bellingham | 501(c)(3) | 2006 | $1.9 million | 2024-12 | |
| Beneficent Blossoms A Nonprofit Corporation | Bellevue | 501(c)(3) | 2025 | |||
| Better World Credits Inc | Seattle | 501(c)(3) | 2009 | $0 | $0 | 2023-06 |
| Bighorn Foundation | Spokane Valley | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Biota Maxima | Winthrop | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Black Diamond Bee Rescue | Port Angeles | 501(c)(3) | 2021 | $0 | $0 | 2023-03 |
| Blue Mountain District of Garden Clubs | Pasco | 501(c)(3) | 2012 | $0 | $0 | 2025-06 |
| Blue Mountain Resourceconservation and Development Council | Waitsburg | 501(c)(3) | 2002 | $0 | $0 | 2025-12 |
| Bocavaldivia Foundation | Kingston | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Bogachiel Garden Club | Forks | 501(c)(3) | 2026 | |||
| Boreal Songbird Initiative | Seattle | 501(c)(3) | 2002 | $0 | $22,552 | 2026-03 |
| Brinnon Group | Brinnon | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Broadview Garden Club | Seattle | 501(c)(3) | 2022 | $0 | $0 | 2025-09 |
| Buck Lake Native Plant Garden Association | Hansville | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Bushwhacker Climbing Club | Seattle | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Byc Sailing Foundation | Bremerton | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| C6 Innovations | Winthrop | 501(c)(3) | 2024 | |||
| Camano Nature-Farm Community Association | Camano Island | 501(c)(3) | 2025 | $28,972 | 2025-12 | |
| Cambodia Clean Water | Spokane | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Camp George | Lynnwood | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Captain Pepperjack | Orting | 501(c)(3) | 2025 | |||
| Carbon Capture Foundation | Longview | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Carbon Forest Foundation | Bellingham | 501(c)(3) | 2008 | $100,621 | 2026-06 | |
| Carbon Standard Dot Earth A Nonprofit Corporation | Seattle | 501(c)(3) | 2022 | $0 | $147,766 | 2025-12 |
| Carbon Washington Foundation | Seattle | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Cascade Cleanup Crew | Lakewood | 501(c)(3) | 2020 | $0 | $0 | 2023-12 |
| Category 5 Wetlands Watch Inc | Seattle | 501(c)(3) | 2023 | $0 | $0 | 2025-01 |
| Central District of Washington State Federation of Garden Clubs | Naches | 501(c)(3) | 2014 | $0 | $0 | 2025-06 |
| Chehalis Stewardship Project | Aberdeen | 501(c)(3) | 2026 | |||
| Chelan Basin Conservancy | Chelan | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| Chewelah Youth Trapshooting | Chewelah | 501(c)(3) | 2026 | |||
| Chinese Northwest Hiker-Camper Association | Kenmore | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Chumstick Wilidfire Stewardship Coalition | Leavenworth | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Citizens To Stop the Sr169 Asphalt Plant Legal Fund | Maple Valley | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Citizens for Forest Roads | Blaine | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Citizens for Improving Long Lake | Port Orchard | 501(c)(3) | 2003 | $0 | $0 | 2024-12 |
| Citizens for Sensible Transportation Planning | Seattle | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Citizens for Sustainable Development | Monroe | 501(c)(4) | 2015 | $0 | $0 | 2025-12 |
| Clarkston Community Garden | Clarkston | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Clean Black Lake Alliance | Olympia | 501(c)(3) | 2023 | $0 | $0 | 2025-09 |
| Clean Water Foundation A Nonprofit Corporation | Seattle | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Clean the Waves | Kirkland | 501(c)(3) | 2026 | |||
| Climate Caravan | Mercer Island | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Co2 Foundation | Seattle | 501(c)(3) | 2021 | $5.7 million | 2025-12 | |
| Coal Creek Community Coalition | Seattle | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Coalition To Protect Puget Sound | Gig Harbor | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Coalition To Protect Puget Sound Habitat | Gig Harbor | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Coalition for Geoengineering Resear CH | Pasco | 501(c)(3) | 2026 | |||
| Coastal Cutthroat Coalition | Olympia | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Columbia Basin Walleye Club | Ephrata | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Columbia Institute for Water Policy | Vashon | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Columbia River Bioregional Education Project | Oroville | 501(c)(3) | 1993 | $0 | $0 | 2025-12 |
| Columbia-Willamette Chapter Enological Society of Pacific NW | Battle Ground | 501(c)(7) | 2016 | $0 | $0 | 2025-12 |
| Coming Alongside | Clinton | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Common Ground Wildlife | Seattle | 501(c)(3) | 2026 | |||
| Community Garden Club of Camas Washougal Washington | Washougal | 501(c)(4) | 2005 | $0 | $0 | 2026-05 |
| Compost the Creek | Mill Creek | 501(c)(3) | 2026 | |||
| Conif | Monroe | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Conifriends | Spokane Vly | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Conservation Connection | Olympia | 501(c)(3) | 2010 | $0 | $0 | 2024-12 |
| Conservation Made Simple | Mill Creek | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Conservation and Preservation Socie Ty Caps | Snohomish | 501(c)(3) | 2025 | |||
| Corgi Cleanups Foundation | Olympia | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Country Lane East Water Association | Othello | 501(c)(12) | 2024 | $0 | $0 | 2025-12 |
| Country Venture V Div 5 6 7 & 8 Road Maintenance | Orting | 501(c)(4) | 2006 | $0 | $0 | 2024-01 |
| Coupeville Garden Club | Coupeville | 501(c)(4) | 2011 | $0 | $0 | 2026-06 |
| Crystal Conservation Coalition | Seattle | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| D-17 Project | Vancouver | 501(c)(3) | 2023 | $0 | $0 | 2025-04 |
| Daryl and Shirley Jenkins Foundation | Longview | 501(c)(3) | 2019 | $0 | $0 | 2026-06 |
| Deer Harbor Yacht Club | Deer Harbor | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Desert Preservation Society | Renton | 501(c)(3) | 2019 | $0 | $0 | 2025-10 |
| Designing Women | Mount Vernon | 501(c)(3) | 2014 | $0 | $0 | 2026-06 |
| Dharma Water Institute | Sequim | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Donate Air | Kirkland | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Dream Change Inc | Bainbridge Is | 501(c)(3) | 1998 | $0 | $0 | 2025-09 |
| Drop of Water Fund for Environmental Education and Commun | Bellingham | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Dukes Auto Club | Spokane | 501(c)(3) | 2025 | $0 | $0 | 2025-08 |
| Dukes Sustainable Solutions Foundation | Seattle | 501(c)(4) | 2019 | $0 | $0 | 2024-12 |
| E-Recyclee | Shorline | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Earth Citizen Center | Seattle | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Earth Daughters | Seattle | 501(c)(3) | 2025 | $0 | $0 | 2026-01 |
| Earthsenseai Center | Seattle | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Earthwise Knowledge Initiative | Tacoma | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| East Fork Community Coalition | Battle Ground | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Ecolearning Together | Kirkland | 501(c)(3) | 2022 | $0 | $0 | 2025-09 |
| Ecological Restoration Collective | Yacolt | 501(c)(3) | 2026 | |||
| Economics for Peace Institute | Port Townsend | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Ecoteach Foundation | Poulsbo | 501(c)(3) | 2000 | $0 | $0 | 2024-12 |
| Eden Collective | Tacoma | 501(c)(3) | 2026 | |||
| Edgewoods Friends of the Parks | Tacoma | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Edmonds Climate Advisory Board | Edmonds | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Edmonds Environmental Council | Edmonds | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Edmonds Floretum Garden Club | Edmonds | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Elma Game Club | Elma | 501(c)(3) | 1994 | $0 | $0 | 2024-12 |
| Endless Trails | Loon Lake | 501(c)(3) | 2015 | $0 | $0 | 2024-12 |
| Energy Forward Alliance | Kennewick | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Esw | Seattle | 501(c)(3) | 2024 | |||
| Everett Garden Club | Everett | 501(c)(3) | 2026 | $0 | $0 | 2025-09 |
| Evergreen Garden Club | Grapeview | 501(c)(3) | 2017 | $0 | $0 | 2025-06 |
| Evervillage | Vashon | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Faraway Nest Foundation | Redmond | 501(c)(3) | 2026 | |||
| Fiber Optics Removal Services | Ridgefield | 501(c)(3) | 2026 | |||
| Finca Dos Lados Reforestation Andresearch Project | Seattle | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Fire Armada | Liberty Lake | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Flash Forward Foundation | Bellevue | 501(c)(3) | 2025 | |||
| Flex Innovation Cluster Partner Network | Washougal | 501(c)(3) | 2025 | |||
| Floracosm | Sammamish | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Flotsam and Jetsam Garden Club | Hansville | 501(c)(3) | 2014 | $0 | $0 | 2025-06 |
| Foam Home | Vancouver | 501(c)(3) | 2025 | |||
| Forensic Agronomic Foundation | Gig Harbor | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Forest Stewards Inc | Vashon | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Foundation for Puget Sound | Seattle | 501(c)(3) | 2009 | $0 | $0 | 2024-12 |
| Fox Island Sand and Soil Garden Club | Fox Island | 501(c)(3) | 2022 | $0 | $0 | 2026-06 |
| Franklin and Evelyn Plant Green Point Foundation | Port Angeles | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Friends of Banner Forest Heritage P Ark | Port Orchard | 501(c)(3) | 2026 | |||
| Friends of Burley Lagoon | Burley | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Friends of Clark County | Ridgefield | 501(c)(3) | 1998 | $0 | $0 | 2024-12 |
| Friends of Cottage Lake | Woodinville | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Friends of Diamond Lake Washington Foundation | Chewelah | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Friends of Green Lake | Seattle | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Friends of Herons Landing at Nicks Lagoon | Seabeck | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Friends of Heybrook Ridge | Index | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Friends of Hooven Forest | Spokane | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Friends of I-5 | Redmond | 501(c)(3) | 2024 | |||
| Friends of Lake Kapowsin | Graham | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Lake Tapps | Lake Tapps | 501(c)(3) | 1999 | $0 | $0 | 2026-06 |
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.