Data / Nonprofits / Maine / Environment
Environment nonprofits in Maine: 426 registered with the IRS
426 environment nonprofits are registered with the IRS in Maine, 416 of them 501(c)(3) charities; the 176 that report revenue took in $228.9 million. The most are in Portland (29), Augusta (20), Yarmouth (12). The largest by revenue: Coastal Maine Botanical Gardens Inc ($28.6 million), Maine Coast Heritage Trust ($22 million), Friends of Acadia ($12.7 million).
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Every organization, largest by revenue first
| Organization | City | Type | Since | Revenue | Assets | Filing |
|---|---|---|---|---|---|---|
| Coastal Maine Botanical Gardens Inc | Boothbay | 501(c)(3) | 1993 | $28.6 million | $82.3 million | 2025-03 |
| Maine Coast Heritage Trust | Topsham | 501(c)(3) | 1971 | $22 million | $312.2 million | 2024-12 |
| Friends of Acadia | Bar Harbor | 501(c)(3) | 1988 | $12.7 million | $100.3 million | 2025-12 |
| Biodiversity | Portland | 501(c)(3) | 1999 | $9.8 million | $7.7 million | 2025-04 |
| Chewonki Foundation Inc | Wiscasset | 501(c)(3) | 1964 | $8 million | $24.6 million | 2025-08 |
| Maine Audubon Society | Falmouth | 501(c)(3) | 1940 | $6 million | $21.6 million | 2025-04 |
| Reverb Inc | Portland | 501(c)(3) | 2006 | $5.7 million | $6.7 million | 2025-12 |
| Frenchman Bay Conservancy | Hancock | 501(c)(3) | 1988 | $5.4 million | $12.1 million | 2025-06 |
| Rangeley Lakes Heritage Trust Inc | Rangeley | 501(c)(3) | 1992 | $5 million | $25.1 million | 2024-12 |
| Hurricane Island Outward Bound School | Camden | 501(c)(3) | 1964 | $4.9 million | $11.9 million | 2024-12 |
| Kittery Land Trust Inc | Kittery | 501(c)(3) | 1988 | $4.9 million | $10.7 million | 2025-12 |
| Schoodic Institute at Acadia National Park | Winter Harbor | 501(c)(3) | 2004 | $4.9 million | $7.3 million | 2024-12 |
| Scarborough Land Conservation Trust | Scarborough | 501(c)(3) | 1978 | $4.3 million | $9.6 million | 2025-06 |
| Forest Society of Maine | Bangor | 501(c)(3) | 1986 | $4 million | $19.2 million | 2025-07 |
| Maine Coast Fishermens Association | Brunswick | 501(c)(3) | 2012 | $3.8 million | $7.5 million | 2025-12 |
| Coastal Rivers Conservation Trust | Damariscotta | 501(c)(3) | 1973 | $3.4 million | $19.1 million | 2025-06 |
| Davis Conservation Foundation | Yarmouth | 501(c)(3) | 1989 | $3.4 million | $40.3 million | 2024-12 |
| Natural Resources Council Inc | Augusta | 501(c)(3) | 1963 | $3.3 million | $18.6 million | 2025-03 |
| Harpswell Heritage Land Trust | Harpswell | 501(c)(3) | 1984 | $3.3 million | $9.2 million | 2025-12 |
| Great Works Regional Land Trust | South Berwick | 501(c)(3) | 1987 | $3.2 million | $14.5 million | 2024-12 |
| 7 Lakes Alliance | Belgrade LKS | 501(c)(3) | 1990 | $3.1 million | $9.2 million | 2024-12 |
| Loon Echo Land Trust Inc | Bridgton | 501(c)(3) | 1990 | $2.9 million | $12.3 million | 2024-12 |
| Coastal Mountains Land Trust | Camden | 501(c)(3) | 1987 | $2.7 million | $10.6 million | 2025-03 |
| Greater Lovell Land Trust Inc | Lovell | 501(c)(3) | 1987 | $2.7 million | $12.4 million | 2025-12 |
| Down East Lakes Land Trust | Grand LK STRM | 501(c)(3) | 2001 | $2.4 million | $32.2 million | 2024-12 |
| Ecology Education Inc | Saco | 501(c)(3) | 2000 | $2.3 million | $14 million | 2024-12 |
| Boothbay Region Land Trust Inc | Boothbay Harbor | 501(c)(3) | 1994 | $2.2 million | $26.1 million | 2025-09 |
| Somerset Woods Trustees | Skowhegan | 501(c)(3) | 1996 | $2.1 million | $3.9 million | 2024-12 |
| Lakes Environment Association | Bridgton | 501(c)(3) | 1971 | $2.1 million | $5.5 million | 2025-12 |
| Island Heritage Trust Inc | Deer Isle | 501(c)(3) | 1987 | $2 million | $3 million | 2025-10 |
| Midcoast Conservancy | Waldoboro | 501(c)(3) | 1971 | $1.9 million | $11 million | 2025-06 |
| Blue Hill Heritage Trust Inc | Blue Hill | 501(c)(3) | 1986 | $1.9 million | $19.4 million | 2025-12 |
| The Kennebec Land Trust | Winthrop | 501(c)(3) | 1993 | $1.7 million | $10.3 million | 2025-06 |
| Fork Food Lab | S Portland | 501(c)(3) | 2012 | $1.6 million | $3.9 million | 2024-12 |
| Friends of Casco Bay | Portland | 501(c)(3) | 1991 | $1.6 million | $3.2 million | 2026-03 |
| Laudholm Trust | Wells | 501(c)(3) | 1982 | $1.6 million | $13.4 million | 2025-06 |
| Small Woodland Owners Association of Maine Inc | Augusta | 501(c)(3) | 1980 | $1.5 million | $3.9 million | 2025-04 |
| Maine Island Trail Association | Portland | 501(c)(3) | 1993 | $1.3 million | $3.1 million | 2025-09 |
| Cape Elizabeth Land Trust Inc | Cape Eliz | 501(c)(3) | 1985 | $1.2 million | $10.3 million | 2025-09 |
| Association of State Wetland Managers Inc | Portland | 501(c)(3) | 1988 | $1.2 million | $610,823 | 2024-12 |
| York Land Trust Inc | York | 501(c)(3) | 1987 | $1.1 million | $17 million | 2024-12 |
| Wild Seed Project | N Yarmouth | 501(c)(3) | 2014 | $1.1 million | $561,340 | 2025-06 |
| Marginal Way Preservation Fund | Ogunquit | 501(c)(3) | 2011 | $1 million | $4.3 million | 2024-12 |
| Acadia Center | Rockport | 501(c)(3) | 1998 | $984,837 | $5.4 million | 2025-12 |
| Downeast Coastal Conservancy | Machias | 501(c)(3) | 1988 | $983,157 | $7.6 million | 2024-12 |
| Southern Maine Conservation Collaborative | Portland | 501(c)(3) | 2014 | $948,699 | $142,828 | 2025-12 |
| Kennebec Estuary Land Trust | Bath | 501(c)(3) | 1994 | $911,817 | $9.8 million | 2025-12 |
| Kennebunkport Conservation Trust | Kennebunkport | 501(c)(3) | 1973 | $887,241 | $30.3 million | 2024-12 |
| Inland Woods Trails | Bethel | 501(c)(3) | 2013 | $880,431 | $2.9 million | 2025-12 |
| Maine Rivers | Yarmouth | 501(c)(3) | 2003 | $853,379 | $648,822 | 2025-03 |
| Portland Trails | Portland | 501(c)(3) | 1992 | $853,332 | $1.9 million | 2024-12 |
| Georges River Land Trust | Rockland | 501(c)(3) | 1987 | $842,180 | $7.5 million | 2024-12 |
| Defend Our Health | Portland | 501(c)(3) | 2010 | $819,835 | $919,145 | 2024-12 |
| Maine Timber Research and Environmental Education Foundation | Augusta | 501(c)(3) | 1990 | $769,614 | $5.1 million | 2024-12 |
| Falmouth Conservation Trust | Falmouth | 501(c)(3) | 1982 | $769,502 | $4.2 million | 2025-06 |
| Growsmart Maine | Augusta | 501(c)(3) | 2004 | $727,830 | $363,714 | 2025-06 |
| Seedmoney | Scarborough | 501(c)(3) | 2003 | $725,950 | $760,906 | 2025-06 |
| Municipal Wastehub | Orono | 501(c)(3) | 1992 | $716,578 | $278,803 | 2024-12 |
| Passivhausmaine | Freeport | 501(c)(3) | 2019 | $690,217 | $929,259 | 2025-06 |
| Mahoosuc Land Trust Inc | Bethel | 501(c)(3) | 1994 | $686,322 | $8.1 million | 2025-12 |
| Cobbosseecontee Lake Association | Manchester | 501(c)(3) | 2019 | $650,882 | $2 million | 2025-12 |
| Woodie Wheaton Land Trust | FRST City TWP | 501(c)(3) | 1996 | $642,455 | $6.8 million | 2024-12 |
| Cat Action Treasury Inc | Cape Neddick | 501(c)(3) | 1996 | $637,900 | $558,727 | 2024-12 |
| Lake Stewards of Maine | Auburn | 501(c)(3) | 1996 | $610,417 | $578,572 | 2025-12 |
| Friends of Cobbossee Watershed District | East Winthrop | 501(c)(3) | 2002 | $590,544 | $239,022 | 2025-12 |
| Quahog Bay Conservation | Harpswell | 501(c)(3) | 2015 | $579,325 | $2 million | 2024-12 |
| Maine Climate Action Now | Augusta | 501(c)(3) | 2023 | $559,469 | $384,733 | 2025-12 |
| Algae Foundation | Poland | 501(c)(3) | 2014 | $554,990 | $1.1 million | 2025-12 |
| Wood Island Life Saving Station Association | Kittery Point | 501(c)(3) | 2012 | $548,133 | $71,367 | 2025-12 |
| Shaw Institute | Blue Hill | 501(c)(3) | 1991 | $539,358 | $939,647 | 2024-12 |
| Vinalhaven Land Trust Inc | Vinalhaven | 501(c)(3) | 1986 | $522,827 | $9.4 million | 2024-12 |
| Friends of Baxter State Park | Belfast | 501(c)(3) | 2000 | $506,876 | $810,484 | 2025-12 |
| Royal River Conservation Trust | Yarmouth | 501(c)(3) | 1993 | $456,901 | $5.6 million | 2025-12 |
| Maine Lobster Community Alliance | Kennebunk | 501(c)(3) | 2013 | $447,264 | $693,851 | 2025-12 |
| Oceanswide Inc | Newcastle | 501(c)(3) | 2007 | $447,195 | $255,452 | 2025-12 |
| Androscoggin Land Trust Inc | Auburn | 501(c)(3) | 1991 | $440,196 | $3 million | 2025-06 |
| A Climate To Thrive | Mount Desert | 501(c)(3) | 2017 | $424,504 | $263,792 | 2024-12 |
| Three Rivers Land Trust | Alfred | 501(c)(3) | 2001 | $416,594 | $4.7 million | 2025-12 |
| Collaborative for Bioregional Action Learning and Transformation | Portland | 501(c)(3) | 2023 | $415,790 | $314,000 | 2025-12 |
| Hancock County Planning Commission | Ellsworth | 501(c)(3) | 1991 | $412,315 | $384,073 | 2025-06 |
| 30 Mile River Watershed Association | Mount Vernon | 501(c)(3) | 2008 | $408,868 | $568,198 | 2024-12 |
| Herring Gut Coastal Science Center | Port Clyde | 501(c)(3) | 2022 | $406,853 | $1.4 million | 2025-06 |
| Home Start | Peaks Island | 501(c)(3) | 2005 | $387,309 | $551,496 | 2024-09 |
| Kennebunk Land Trust | Kennebunk | 501(c)(3) | 1973 | $375,736 | $8.5 million | 2024-12 |
| Boothbay Harbor Waterfront Preservation | Boothbay HBR | 501(c)(3) | 2018 | $373,671 | $6.6 million | 2024-12 |
| Brunswick Downtown Association | Brunswick | 501(c)(3) | 2004 | $373,493 | $239,658 | 2024-12 |
| St Croix International Waterway Commission | Calais | 501(c)(3) | 2020 | $365,726 | $192,311 | 2024-12 |
| Squirrel Island Preservation Foundation | Portland | 501(c)(3) | 1988 | $357,753 | $10.9 million | 2025-12 |
| Maine Lakes Society | Yarmouth | 501(c)(3) | 1979 | $336,391 | $264,051 | 2024-12 |
| Hartley Mason Reservation | York | 501(c)(3) | 1998 | $334,760 | $1.2 million | 2025-12 |
| Viles Arboretum | Augusta | 501(c)(3) | 1983 | $323,095 | $1.4 million | 2025-12 |
| Friends of Merrymeeting Bay | Richmond | 501(c)(3) | 1991 | $290,694 | $819,789 | 2025-12 |
| Sea Meadow Marine Foundation | Yarmouth | 501(c)(3) | 2021 | $283,087 | $2.8 million | 2025-12 |
| Justme for Justus | S Freeport | 501(c)(3) | 2024 | $281,399 | $266,817 | 2025-12 |
| Monhegan Associates Inc | Cape Eliz | 501(c)(3) | 2009 | $278,145 | $963,869 | 2025-05 |
| Thompson Lake Environmental Association Inc | Oxford | 501(c)(3) | 1987 | $276,484 | $901,908 | 2025-12 |
| Maine Sfi Implementation Committee Inc | Augusta | 501(c)(3) | 2024 | $268,696 | $91,085 | 2025-12 |
| Little Sebago Lake Association | Windham | 501(c)(3) | 2004 | $261,692 | $677,450 | 2024-12 |
| World Ocean Observatory | Sedgwick | 501(c)(3) | 2014 | $237,532 | $25,156 | 2025-12 |
| Environmental & Energy Council of Maine | Augusta | 501(c)(3) | 2003 | $236,917 | $158,935 | 2025-06 |
| Allagash Wilderness Waterway Foundation | Casco | 501(c)(3) | 2012 | $230,471 | $216,298 | 2025-06 |
| Between the Rivers Nature Center | Greenville | 501(c)(3) | 2009 | $227,933 | $10 million | 2025-07 |
| Maine Wilderness Watershed Trust Inc | Augusta | 501(c)(3) | 1994 | $224,152 | $3 million | 2025-12 |
| Maine Resource Recovery Association | Newport | 501(c)(3) | 2003 | $223,731 | $586,875 | 2025-06 |
| Crabtree Neck Land Trust | Hancock | 501(c)(3) | 2006 | $219,527 | $3.4 million | 2025-12 |
| Damariscotta Mills Fish Ladder Restoration | Nobleboro | 501(c)(3) | 2024 | $215,231 | $186,594 | 2025-12 |
| Seal Harbor Village Improvement Society Inc | Seal Harbor | 501(c)(3) | 1952 | $214,711 | $202,816 | 2026-06 |
| Arundel Conservation Trust | Kennebunkport | 501(c)(3) | 2019 | $212,505 | $558,511 | 2024-12 |
| Sebasticook Regional Land Trust | Unity | 501(c)(3) | 2006 | $210,430 | $2.2 million | 2024-12 |
| North Haven Conservation Partners | North Haven | 501(c)(3) | 1997 | $207,523 | $4 million | 2025-12 |
| Boothbay Region Maritime Foundation | Boothbay HBR | 501(c)(3) | 2020 | $205,211 | $29,874 | 2025-12 |
| Oxford Hills Community Gardens | Norway | 501(c)(3) | 2011 | $200,556 | $361,868 | 2024-12 |
| McLaughlin Foundation Inc | South Paris | 501(c)(3) | 1997 | $197,140 | $653,244 | 2025-12 |
| Friends of Hog Island | Bremen | 501(c)(3) | 2011 | $194,291 | $325,306 | 2025-12 |
| Maine Association of Conservation Districts | Portland | 501(c)(3) | 1993 | $192,385 | $104,632 | 2025-12 |
| Our Climate Common | Georgetown | 501(c)(3) | 2021 | $185,155 | $157,504 | 2025-12 |
| Midcoast Trails Stewardship | Rockland | 501(c)(3) | 2024 | $167,349 | $73,925 | 2024-12 |
| Maine Mountain Collaborative | Portland | 501(c)(3) | 2017 | $166,384 | $184,162 | 2024-12 |
| Worromon Togus Lake Association | Augusta | 501(c)(3) | 2010 | $164,089 | $238,094 | 2025-12 |
| Upstream Watch | Bridgton | 501(c)(3) | 2019 | $163,974 | $94,018 | 2024-12 |
| Kezar Lake Association | Lovell | 501(c)(3) | 1971 | $163,752 | $452,061 | 2025-12 |
| New England Botanical Club Inc | Arrowsic | 501(c)(3) | 1976 | $161,874 | $2.9 million | 2025-12 |
| Maine Conservation Alliance | Augusta | 501(c)(3) | 2001 | $157,060 | $1.3 million | 2025-03 |
| Maine Appalachian Trail Land Trust | Portland | 501(c)(3) | 2002 | $151,147 | $1.8 million | 2025-03 |
| One Big Sustainable Island | Monmouth | 501(c)(3) | 2015 | $149,655 | $150,804 | 2025-12 |
| Skutik River Restoration Trust | Portland | 501(c)(3) | 2025 | $149,102 | $359,471 | 2025-12 |
| Declare Gods Wonders Inc | Bridgton | 501(c)(3) | 2012 | $146,283 | $109,968 | 2025-12 |
| Center for Ecological Teaching and Learning | Edmunds TWP | 501(c)(3) | 2020 | $145,284 | $459,059 | 2025-12 |
| Moosehead Outdoor Alliance | Greenville | 501(c)(3) | 2021 | $139,559 | $16,510 | 2025-12 |
| Androscoggin River Watershedcouncil | Auburn | 501(c)(3) | 2006 | $138,729 | $20,651 | 2025-09 |
| Maine Indoor Air Quality Council | Augusta | 501(c)(3) | 1999 | $134,550 | $73,502 | 2025-06 |
| Lake Arrowhead Conservation Council | N Waterboro | 501(c)(3) | 2008 | $126,785 | $114,772 | 2026-04 |
| Bangor Land Trust | Bangor | 501(c)(3) | 2002 | $124,492 | $1.3 million | 2025-12 |
| Grace Hudowalski Charitable Trust | Windham | 501(c)(3) | 1999 | $117,856 | $451,390 | 2024-12 |
| Francis Small Heritage Trust Inc | Limerick | 501(c)(3) | 1990 | $113,385 | $2.8 million | 2025-12 |
| Saco River Recreational Council Inc | Fryeburg | 501(c)(3) | 2015 | $108,874 | $91,025 | 2024-12 |
| Coastx | Kittery Point | 501(c)(3) | 2024 | $102,994 | $62,208 | 2025-12 |
| Kennebec Riverview | Bath | 501(c)(3) | 2024 | $101,680 | $781,456 | 2025-12 |
| Friends of Messalonskee | Oakland | 501(c)(3) | 2002 | $96,572 | $127,177 | 2025-12 |
| Borneo Research Council | Phillips | 501(c)(3) | 2009 | $91,533 | $678,234 | 2024-12 |
| Acton-Shapleigh Youth Conservation Corps | Springvale | 501(c)(3) | 2006 | $91,369 | $93,667 | 2024-12 |
| Moose Pond Association | Bridgton | 501(c)(3) | 2009 | $88,862 | $168,084 | 2025-12 |
| Friends of Harriet L Hartley Conservation Area | Belfast | 501(c)(3) | 2020 | $80,706 | $71,762 | 2024-12 |
| The Downeast Chapter of Maine Audubon | Ellsworth | 501(c)(3) | 1989 | $75,316 | $622,455 | 2025-12 |
| Friends of Lake Winnecook Inc | Unity | 501(c)(3) | 2021 | $72,385 | $79,053 | 2025-07 |
| Exemplary Forestry Management Inc | Portland | 501(c)(3) | 2023 | $71,800 | $74,631 | 2024-12 |
| Forks Area Trails Club | The Forks PLT | 501(c)(3) | 2017 | $71,764 | $342,031 | 2024-12 |
| Phippsburg Land Trust | Phippsburg | 501(c)(3) | 1994 | $70,508 | $2.3 million | 2025-12 |
| Bangor Beautiful Inc | Bangor | 501(c)(3) | 2023 | $70,050 | $33,601 | 2025-12 |
| Association of U S Delegates To the Gulf of Maine Council On the Marin | Ogunquit | 501(c)(3) | 1993 | $69,541 | $121,582 | 2025-06 |
| Mousam Lake Region Association | Springvale | 501(c)(3) | 2007 | $65,969 | $138,751 | 2025-12 |
| North Pond Association Inc | Smithfield | 501(c)(3) | 2005 | $56,860 | $327,761 | 2025-12 |
| Raymond Waterways Protective Association | Raymond | 501(c)(3) | 2005 | $56,621 | $133,012 | 2025-12 |
| Eopa Code Blue Water Solutions | Solon | 501(c)(4) | 2025 | $50,068 | $221,454 | 2024-12 |
| Meddybemps Lake Land Trust | Orono | 501(c)(3) | 2016 | $49,670 | $47,594 | 2025-12 |
| Farm Tomorrow | Gouldsboro | 501(c)(3) | 2011 | $48,186 | $364,942 | 2025-12 |
| Society for Human Ecology | Bar Harbor | 501(c)(3) | 2009 | $47,060 | $76,606 | 2024-12 |
| Bioregional Conservacy & Reclamation Trust | Unity | 501(c)(3) | 1999 | $44,571 | $86,885 | 2025-06 |
| Peaks Island Land Preserve | Peaks Island | 501(c)(3) | 1995 | $40,613 | $2 million | 2024-12 |
| Sanford-Springvale Mousam Way Land Trust | Sanford | 501(c)(3) | 2004 | $38,732 | $4.5 million | 2025-12 |
| Louds Island Conservancy | Bremen | 501(c)(3) | 2023 | $34,007 | $111,023 | 2025-12 |
| Garden Club Federation of Maine Inc | Camden | 501(c)(3) | 2022 | $30,443 | $72,161 | 2026-03 |
| Boothbay Region Garden Club Inc | Boothbay | 501(c)(3) | 2004 | $27,582 | $123,411 | 2025-05 |
| Protect Ancient Forests | Camden | 501(c)(3) | 2022 | $22,409 | $6,547 | 2024-12 |
| Stewardship Education Alliance | Camden | 501(c)(3) | 2020 | $22,099 | $23,140 | 2024-12 |
| Friends of the Kennebec River Rail Trail Inc | Augusta | 501(c)(3) | 1997 | $18,663 | $132,686 | 2025-12 |
| Maine Guides Education Fund | Hermon | 501(c)(3) | 2007 | $18,563 | $31,882 | 2024-12 |
| Biddeford Pool Land Trust | Biddeford Pool | 501(c)(3) | 1998 | $16,903 | $988,942 | 2023-06 |
| Friends of Tim Pond | Eustis | 501(c)(3) | 2018 | $15,808 | $212,669 | 2025-12 |
| Save Our Shores Maine | Wells | 501(c)(3) | 1995 | $15,588 | $206,897 | 2025-06 |
| Almanac Region Land Trust | Springfield | 501(c)(3) | 2020 | $10,131 | $256,590 | 2025-12 |
| Bauneg Beg Lake Association Inc | North Berwick | 501(c)(3) | 2013 | $9,946 | $90,608 | 2025-12 |
| Dark Sky Maine | Blue Hill | 501(c)(3) | 2020 | $6,250 | $13,733 | 2025-12 |
| Friends of Lower and Middle Lead Mountain Ponds | Hampden | 501(c)(3) | 2017 | $2,123 | $358,403 | 2025-12 |
| Maine Wildlife Conservation Council | Augusta | 501(c)(4) | 2016 | $590 | $37,023 | 2023-12 |
| Hedgehog Mountain Land Trust Inc | Eagle Lake | 501(c)(3) | 1993 | $179 | $25,169 | 2024-12 |
| After Party Inc | Portland | 501(c)(3) | 2026 | $0 | $0 | 2024-12 |
| Alamoosook Lake Association | Orland | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Alford Lake Lermond Pond Association | Rockport | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Allagash Atv Riders | Allagash | 501(c)(3) | 2016 | $0 | $0 | 2025-05 |
| Annabessacook Lake Improvement Association | Winthrop | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Association To Promote and Protect the Lubec Environment | Lubec | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Augusta Trails | Augusta | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Bagaduce Watershed Association | Penobscot | 501(c)(3) | 2004 | $0 | $0 | 2026-07 |
| Bangor Area Storm Water Group Inc | Orono | 501(c)(3) | 2009 | $0 | $0 | 2025-06 |
| Bangor Greendrinks Inc | Bangor | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Bear Pond Improvement Association | Turner | 501(c)(3) | 2026 | |||
| Beautify Rumford | Rumford | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Belfast Bay Watershed Coalition | Belfast | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Belfast Garden Club | Belfast | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Belgrade Rome Special Needs Food Pantry | Belgrade | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Belize Conservation Group | Nobleboro | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Berry Dexter Wilson Watershed Association | N Monmouth | 501(c)(3) | 2020 | $0 | $0 | 2026-07 |
| Bickford Place Road Corporation | Belgrade | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Biddeford Pool Conservation Trust | Biddeford PL | 501(c)(3) | 2024 | |||
| Biome Friends Inc | York | 501(c)(3) | 2025 | |||
| Blandings Park Wildlife Sanctuary | Biddeford | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Blue Hill Garden Club Inc | Blue Hill | 501(c)(3) | 2004 | $0 | $0 | 2024-12 |
| Blue Hill Peninsula Forward | Blue Hill | 501(c)(3) | 2026 | |||
| Blue Ridge Riders Sportsmans Club | Rockwood | 501(c)(3) | 2026 | |||
| Boothbay Civic Association Inc | Boothbay | 501(c)(3) | 2019 | $0 | $0 | 2026-05 |
| Brewer Land Trust | Brewer | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Brooklin Garden Club | Brooklin | 501(c)(3) | 2019 | $0 | $0 | 2026-05 |
| Brunswick Area Citizens for A Safe Environment | Brunswick | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Bunganut Pond Association Inc | Alfred | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Camden Hills Wildlife Trust | Camden | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Casco Bay Trail Alliance | Yarmouth | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Casco-Naples Earth Day Organization | Naples | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Center for An Ecology-Based Economy | Norway | 501(c)(3) | 2014 | 2024-06 | ||
| Center for Climate Adaptation Research | Saco | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Chemo Pond Lake Association | Clifton | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| China Region Lakes Alliance | China Village | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Chiputneticook Lakes International Conservancy | Orient | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Clary Lake Association | Whitefield | 501(c)(3) | 2014 | $0 | $0 | 2025-07 |
| Clearwater Lake Improvement Association | Farmington | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Clemons Pond Association | Hiram | 501(c)(4) | 2025 | $0 | $0 | 2025-12 |
| Cliff Island Coporation for Athletics & Conservation Education | Cliff Island | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Cobscook Bay Resource Center Inc | Eastport | 501(c)(3) | 2000 | $0 | $0 | 2025-06 |
| Cochnewagon Lake Preservation Assoc Iation | Monmouth | 501(c)(3) | 2026 | $0 | $0 | 2026-06 |
| Coggins Hill Preservation Association | Union | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Cold Stream Campowners Association | Enfield | 501(c)(3) | 2009 | $0 | $0 | 2026-06 |
| Collins Pond Improvement Association | Windham | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Community Conservation Initiative | Portland | 501(c)(3) | 2022 | $0 | $0 | 2023-12 |
| Community Lakes Association | Greenwood | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Conservation Media Group | Camden | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Covenant Community Land Trust Inc | Orland | 501(c)(3) | 2024 | $0 | $0 | 2024-12 |
| Craigs Pond Association | Bangor | 501(c)(4) | 2006 | $0 | $0 | 2025-08 |
| Cranberry Meadow Preserve | Belfast | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Crescent Lake Watershed Association | Raymond | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Deering Center Neighborhood Association | Portland | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Defend Our Health Action | Portland | 501(c)(4) | 2014 | $0 | $0 | 2025-12 |
| East Pond Association | Smithfield | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Echo Lake Association Incorporated | Falmouth | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Eco Maine | Portland | 501(c)(3) | 2008 | |||
| Ecotat Trust | Hermon | 501(c)(3) | 1995 | $0 | $0 | 2025-12 |
| Edgecomb Community Solar Farm Association | Damariscotta | 501(c)(12) | 2017 | $0 | $0 | 2025-08 |
| Empathy Data | York | 501(c)(3) | 2020 | $0 | $0 | 2023-12 |
| Environmental Bolivia | Kennebunk | 501(c)(3) | 2005 | $0 | $0 | 2025-12 |
| Evergreen Garden Club Inc | Deer Isle | 501(c)(3) | 2002 | $0 | $0 | 2026-06 |
| Fly Fishing in Maine Inc | Yarmouth | 501(c)(3) | 2008 | $0 | $0 | 2025-12 |
| Flying Pond Improvement Association | Mount Vernon | 501(c)(3) | 2015 | $0 | $0 | 2026-06 |
| Foothills Land Conservancy Inc | Wilton | 501(c)(3) | 1998 | $0 | $0 | 2024-12 |
| Forest Ecology Network | Lexington TWP | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Forest Lake Association | Gray | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Frank Knight Foundation | Yarmouth | 501(c)(3) | 2019 | $0 | $0 | 2025-06 |
| Free the Andro | Brunswick | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Friends of Aroostook National Wildlife Refuge Inc | Limestone | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Friends of Blue Hill Bay | Blue Hill | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Friends of Craig Brook Incorporated | East Orland | 501(c)(3) | 1996 | $0 | $0 | 2025-12 |
| Friends of Cross Lake | Cross Lke TWP | 501(c)(3) | 2020 | $0 | $0 | 2026-06 |
| Friends of Deering Oaks | Portland | 501(c)(3) | 1998 | $0 | $0 | 2025-12 |
| Friends of Downtown Portland Maine | Portland | 501(c)(3) | 2025 | |||
| Friends of Fort Sumner Park | Portland | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Friends of Monson Pond | Ft Fairfield | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Friends of Mount Agamenticus | Cape Neddick | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Quimby Pond | Rangeley | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Friends of Rachel Carson National Wildlife Refuge | Kennebunk | 501(c)(3) | 2018 | $0 | $0 | 2025-09 |
| Friends of Richardson | Rumford | 501(c)(3) | 2010 | $0 | $0 | 2023-06 |
| Friends of Sears Island | Searsport | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Friends of Shapleigh Pond | West Newfield | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Friends of Taunton Bay | Hancock | 501(c)(3) | 2004 | $0 | $0 | 2026-07 |
| Friends of Walker Pond | Brooksville | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Friends of Western Promenade | Portland | 501(c)(3) | 2019 | $0 | $0 | 2025-12 |
| Friends of Wilson Lake | Wilton | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Friends of Worthley Pond Inc | Peru | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Friends of the Boundary Mountains Inc | Farmington | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Friends of the Presumpscot River | Westbrook | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Garden Club Federation of Maine | Eliot | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Garden Club Federation of Maine Inc | Falmouth | 501(c)(3) | 1995 | $0 | $0 | 2025-05 |
| Garden Club Federation of Maine Inc | Bath | 501(c)(3) | 2006 | $0 | $0 | 2025-05 |
| Garden Club Federation of Maine Inc | Scarborough | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Garden Club Federation of Maine Inc | Scarborough | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Garden Club Federation of Maine Inc | York | 501(c)(3) | 1995 | $0 | $0 | 2025-08 |
| Garden Club Federation of Maine Inc | Farmington | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Garden Club Federation of Maine Inc | Hampden | 501(c)(3) | 2006 | $0 | $0 | 2026-05 |
| Garden Club Federation of Maine Inc | Milo | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Garden Club Federation of Maine Inc | Buxton | 501(c)(3) | 1995 | $0 | $0 | 2026-05 |
| Garden Club of Wiscasset Inc | Wiscasset | 501(c)(3) | 2014 | $0 | $0 | 2025-05 |
| Garden Institute at Merry Gardens | Camden | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Georges Pond Association | Franklin | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Giving Tree Learning Center | Camden | 501(c)(3) | 2023 | $60,562 | 2024-12 | |
| Great Diamond Island Land Preserve | S Portland | 501(c)(3) | 2006 | $0 | $0 | 2024-12 |
| Greater Minnehonk Lake Association | Mount Vernon | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Greater Pushaw Lake Association Inc | Stillwater | 501(c)(3) | 2012 | $0 | $0 | 2025-12 |
| Green Lake Association | Holden | 501(c)(3) | 2009 | $0 | $0 | 2025-12 |
| Hancock and Sand Ponds Association | Denmark | 501(c)(3) | 2016 | $0 | $0 | 2024-06 |
| Happy Home Technologies | Orono | 501(c)(3) | 2026 | |||
| Harriman Pond Lake Association | Dedham | 501(c)(3) | 2026 | $0 | $0 | 2026-01 |
| Highland Lake Association | Windham | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Holbrook Island Sanctuary | Brooksville | 501(c)(3) | 1964 | $0 | $0 | 2025-12 |
| Holden Land Trust | Holden | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Howard Pond Preservation Association | Hanover | 501(c)(3) | 2005 | $0 | $0 | 2025-06 |
| International Peace Park Expeditions Inc | Scarborough | 501(c)(3) | 2010 | $0 | $0 | 2024-12 |
| Island Falls Lakes Association | Island Falls | 501(c)(3) | 2015 | $0 | $0 | 2026-06 |
| Island Pond Watershed Association | Raymond | 501(c)(3) | 2008 | $0 | $0 | 2025-07 |
| Island Rover Foundation | Freeport | 501(c)(3) | 2001 | $0 | $0 | 2025-12 |
| Keep the Kennebunk Dams Save the Mousam | Kennebunk | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Kennebec River Company | Kingfield | 501(c)(3) | 2019 | $0 | $0 | 2026-02 |
| Kennebec River Restoration Trust | Brunswick | 501(c)(3) | 2026 | $0 | $0 | 2025-12 |
| Kennebec Valley Garden Club | Augusta | 501(c)(3) | 2016 | $0 | $0 | 2025-05 |
| Keoka Lake Association | Waterford | 501(c)(3) | 2017 | $0 | $0 | 2025-12 |
| Keyes Pond Environmental Protection Association | Cumberlnd Center | 501(c)(3) | 2022 | $0 | $0 | 2026-07 |
| LCRC Land Conservation Corp | Damariscotta | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Lake Anasagunticook Association | Canton | 501(c)(3) | 2009 | $0 | $0 | 2026-06 |
| Lake Weserrunset Association | Madison | 501(c)(3) | 2007 | $0 | $0 | 2026-06 |
| Lakes Assocation of Norway Maine Inc | Norway | 501(c)(3) | 2002 | $0 | $0 | 2026-06 |
| Litterpic Inc | Wells | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Long Creek Watershed Management District | Windham | 501(c)(3) | 2011 | |||
| Long Pond Association | Parsonsfield | 501(c)(3) | 2020 | $0 | $0 | 2025-06 |
| Loon Pond Betterment Association | Acton | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Madawaska Long Lake Property Owners | Madawaska | 501(c)(3) | 2007 | $0 | $0 | 2025-12 |
| Maine Chapter of the American Chestnut Foundation | Bangor | 501(c)(3) | 2001 | $0 | $0 | 2023-12 |
| Maine Clammers Association | Freeport | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Maine Master Naturalist Program | Waldoboro | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Maine Materials Exchange | Freeport | 501(c)(3) | 1997 | $0 | $0 | 2025-12 |
| Maine Mycological Association Inc | Cumb Foreside | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Maine Rockweed Coalition | Pembroke | 501(c)(3) | 2021 | $0 | $0 | 2024-12 |
| Maine Sporting Camp Heritage Foundation | Hampden | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Maine Tree Farm Program | Augusta | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Maine Woods Forever | Kennebunkport | 501(c)(3) | 2006 | $0 | $0 | 2025-12 |
| Maines Center for Sustainability | S Portland | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Maranacook Lake Association Inc | Winthrop | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Mark Baumer Sustainability Fund | Bryant Pond | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| McGrath Pond-Salmon Lake Association Inc | Oakland | 501(c)(3) | 2000 | $0 | $0 | 2025-12 |
| Mensk | Portland | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Mid-Maine Waste Action Corporation | Auburn | 501(c)(3) | 1992 | |||
| Moosehead Region Futures Corporation | Greenville | 501(c)(3) | 2008 | $0 | $0 | 2024-12 |
| Moosehead Regional Land Trust Inc | Greenvlle JCT | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Mountain Division Alliance | Standish | 501(c)(3) | 2005 | $0 | $0 | 2024-12 |
| Nanoq Guide Services & Survival Training | Dovr Foxcroft | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Nation Treasures | Sullivan | 501(c)(3) | 2016 | $0 | $0 | 2024-12 |
| National Environmental Training Association | S Portland | 501(c)(3) | 1979 | $0 | $0 | 2025-12 |
| Natural Resources Council of Maine Action Fund Inc | Augusta | 501(c)(4) | 2018 | $0 | $0 | 2026-03 |
| Nature & Us | Lewiston | 501(c)(3) | 2018 | $0 | $0 | 2024-12 |
| Nature Lab | York | 501(c)(3) | 2026 | |||
| New England Environmental Resource Federation | Richmond | 501(c)(3) | 2015 | $0 | $0 | 2025-06 |
| New England Fishermens Foundation | S Portland | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| New England Garden Clubs | Camden | 501(c)(3) | 2018 | $0 | $0 | 2026-06 |
| New England Mineral Association | Poland | 501(c)(3) | 2014 | $0 | $0 | 2025-10 |
| North Gorham Pond Invasive Plant Management Association | Gorham | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Norway-Paris Fish & Game Assoc | Norway | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Old Surry Village Schoolhouse Preservation Group | Surry | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| One Fish Foundation | Yarmouth | 501(c)(3) | 2015 | $0 | $0 | 2024-12 |
| Ornamental Horticulture Council | Portland | 501(c)(5) | 2024 | |||
| Owls Head South Thomaston and Thomaston Solid Waste Corporation | Thomaston | 501(c)(3) | 2009 | |||
| Panther Pond Association | Raymond | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Parker Pond Association Inc | Vienna | 501(c)(3) | 2004 | $0 | $0 | 2025-12 |
| Partners of Union River | Ellsworth | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Pastoral Resources for Youth Ministry Encouragement | Rockland | 501(c)(3) | 1999 | $0 | $0 | 2025-12 |
| Peaks Environmental Action Team | Peaks Island | 501(c)(3) | 2013 | $0 | $0 | 2025-12 |
| Penobscot Fly Fishers | Brewer | 501(c)(3) | 1998 | $0 | $0 | 2025-05 |
| Penobscot River Paddling Trail | Richmond | 501(c)(3) | 2018 | $0 | $0 | 2025-12 |
| Penobscot River and Bay Institute | Milford | 501(c)(3) | 1993 | $0 | $0 | 2025-12 |
| Penobscotsc1887 | Brewer | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Phillips Lake Association | Dedham | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Physicians for A National Health Program | Manchester | 501(c)(3) | 1990 | $0 | $0 | 2025-12 |
| Physicians for Social Responsibility Inc | Augusta | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Pleasant Pond Protective Association Incorporated | Caratunk | 501(c)(3) | 2026 | |||
| Pleasant River Fish and Game Conservation Association Inc | Columbia FLS | 501(c)(3) | 2012 | $0 | $0 | 2024-12 |
| Poland Garden Club | Poland | 501(c)(3) | 2026 | $0 | $0 | 2026-06 |
| Portsmouth Community Garden | Kittery | 501(c)(3) | 2021 | $0 | $0 | 2025-12 |
| Preserve Rural Maine | Albion | 501(c)(3) | 2023 | $0 | $0 | 2025-12 |
| Property Owners of Lovewell Pond Association | Fryeburg | 501(c)(3) | 2005 | $0 | $0 | 2026-06 |
| Protect Maines Fishing Heritage Foundation | Portland | 501(c)(3) | 2020 | $38,549 | 2025-12 | |
| Protect South Portland | S Portland | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Prouts Neck Conservancy | Scarborough | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Range Ponds Association | Poland Spring | 501(c)(3) | 2013 | $0 | $0 | 2025-06 |
| Repickle Project | Portland | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Repurposed Waders | Yarmouth | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Restoration Laos | Bath | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Reuse Me Inc | South China | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Ripley Pond and Dam Association | Vassalboro | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Roarke Regenerative Land Management | Saco | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Robert and Patricia Switzer Foundation | Belfast | 501(c)(3) | 1986 | $17 million | 2025-06 | |
| Rock Haven Lake Association | West Newfield | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Rockport Garden Center | Rockport | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Royal River Alliance | Yarmouth | 501(c)(3) | 2026 | |||
| Sabattus Pond Watershed Project | Sabattus | 501(c)(3) | 2024 | |||
| Sabbath Day Lake Association | Gray | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Sacred Connections Inc | Yarmouth | 501(c)(3) | 2026 | |||
| Saving Maine | Owls Head | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Sebago Cove Preservation Association | Naples | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Sebec Lake Association | Dovr Foxcroft | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Seed Tree Inc | Stockton SPGS | 501(c)(3) | 1997 | $0 | $0 | 2025-09 |
| Sharecenter | Lewiston | 501(c)(3) | 2026 | |||
| Sheepscot Lake Association | Palermo | 501(c)(3) | 2014 | $0 | $0 | 2026-05 |
| Silver Lake Camp Owners Assoc Charter 19480006ND | Roxbury | 501(c)(3) | 2011 | $0 | $0 | 2025-06 |
| Skeleton Figure Commons | S Portland | 501(c)(3) | 2026 | |||
| Sly Brook Adventures | Eagle Lake | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Sopo Soccer | Gray | 501(c)(3) | 2024 | |||
| Southern Maine Daylily Society | West Newfield | 501(c)(3) | 2024 | $0 | $0 | 2025-12 |
| Sportsmen Inc | Stockholm | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Square Pond Improvement Association | Shapleigh | 501(c)(3) | 2011 | $0 | $0 | 2025-12 |
| Star City Atv Club | Presque Isle | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Strathglass Park Preservation Society | Rumford | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Tacoma Lakes Association | Litchfield | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| Taylor Pond Association | Auburn | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| The Ellsworth Garden Club | Ellsworth | 501(c)(3) | 2014 | $0 | $0 | 2026-05 |
| The Wild Blueberry Collective | Swanville | 501(c)(3) | 2026 | |||
| Thomas Pond Improvement Association | South Casco | 501(c)(3) | 2024 | $0 | $0 | 2025-05 |
| Thomaston Garden Club | Thomaston | 501(c)(3) | 2022 | $0 | $0 | 2024-12 |
| Three Mile Pond Association | South China | 501(c)(3) | 2026 | |||
| Time & Tide Resource Conservation and Development Area | Augusta | 501(c)(3) | 1978 | $0 | $0 | 2025-12 |
| Toddy Pond Association | Blue Hill | 501(c)(3) | 2015 | $0 | $0 | 2025-12 |
| Toothaker Pond Association | Auburn | 501(c)(4) | 2008 | $0 | $0 | 2025-12 |
| Torsey Pond Association | Mount Vernon | 501(c)(3) | 2015 | $0 | $0 | 2026-06 |
| Triceratops Group | Portland | 501(c)(3) | 2022 | $0 | $0 | 2025-12 |
| Trickey Pond Environmental Protection Association Inc | Naples | 501(c)(3) | 2010 | $0 | $0 | 2025-12 |
| Tumbledown Conservation Alliance | Weld | 501(c)(3) | 2003 | $0 | $0 | 2025-12 |
| Twin Town Nature Club | Oxford | 501(c)(3) | 2002 | $10,509 | 2024-12 | |
| Tyrol Land Group Inc | E Waterboro | 501(c)(3) | 2025 | |||
| Upper St John Land Trust | Fort Kent | 501(c)(3) | 1991 | $0 | $0 | 2026-03 |
| Upstream | Gardiner | 501(c)(3) | 2017 | $0 | $0 | 2025-06 |
| Ward Pond Association | Sidney | 501(c)(4) | 2014 | $0 | $0 | 2025-12 |
| Washington Lakes Association | Washington | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Watchic Lake Association Inc | Standish | 501(c)(3) | 2008 | $0 | $0 | 2025-06 |
| Webber Pond Association Inc | Vassalboro | 501(c)(3) | 2026 | |||
| West Harbor Pond Watershed Association | W Boothby HBR | 501(c)(3) | 2014 | $0 | $0 | 2025-12 |
| Westbrook Environmental Improvement Corporation | Westbrook | 501(c)(3) | 2014 | |||
| Wilder Waters Community | Canton | 501(c)(3) | 2017 | $0 | $0 | 2024-12 |
| Wilderness Guides Outdoor Education Fund | Dresden | 501(c)(3) | 2020 | $0 | $0 | 2025-12 |
| Wildlife Research Foundation | Canaan | 501(c)(3) | 2012 | $0 | $0 | 2026-02 |
| Wildwood Marsh Conservancy | Leeds | 501(c)(3) | 2025 | $0 | $0 | 2025-12 |
| Woods Pond Water Quality Association | Bridgton | 501(c)(3) | 2016 | $0 | $0 | 2025-12 |
| World Mine Tailings Failures | Stonington | 501(c)(3) | 2019 | $0 | $0 | 2024-12 |
| Worldview XR | Casco | 501(c)(3) | 2025 | $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.