Organizations
Largest first
By revenue on the last return. Organizations that file Form 990-N report no figures and come last.
| Organization | Return | Revenue |
|---|---|---|
| Chesapeake Audubon SocietyEaston | Form 990 | $1,456,648FY2025 |
| Severn River Association IncAnnapolis | Form 990 | $1,418,913FY2025 |
| Nuclear Information & Resource ServiceMount Rainier | Form 990 | $1,398,762FY2025 |
| Team River Runner IncRockville | Form 990 | $1,395,190FY2024 |
| Bay Journal Media IncMayo | Form 990 | $1,378,786FY2025 |
| Cecil Land TrustElkton | Form 990 | $1,367,646FY2025 |
| Defensores de La CuencaHyattsville | Form 990 | $1,332,831FY2024 |
| Opportunity Ministries IncPasadena | Form 990 | $1,196,427FY2025 |
| Adkins Arboretum LtdRidgely | Form 990 | $1,109,069FY2024 |
| Interfaith Partners for the Chesapeake IncAnnapolis | Form 990 | $1,106,545FY2024 |
| Cylburn Arboretum Friends IncBaltimore | Form 990 | $1,105,227FY2025 |
| Ioos AssociationSilver Spring | Form 990 | $1,078,614FY2025 |
| Lower Shore Land Trust IncSnow Hill | Form 990 | $1,044,897FY2025 |
| Chesapeake Rivers Association IncAnnapolis | Form 990 | $1,039,993FY2025 |
| American Chestnut Land Trust IncPrince Frederick | Form 990 | $981,870FY2023 |
| Vine Corps IncCheverly | Form 990 | $844,153FY2025 |
| Baltimore Green Space a Land Trustfor Community-Managed Open Space inBaltimore | Form 990 | $841,361FY2024 |
| Chesapeake Wildlife Heritage IncChester | Form 990 | $803,635FY2024 |
| Our Climate Education FundBethesda | Form 990 | $796,801FY2023 |
| Scenic Rivers Land Trust IncAnnapolis | Form 990 | $777,020FY2024 |
| Old-Growth Forest NetworkBerlin | Form 990 | $690,347FY2024 |
| National Turfgrass Evaluation Program IncBeltsville | Form 990 | $689,564FY2025 |
| ThorpewoodFrederick | Form 990 | $668,596FY2025 |
| Evergreen Heritage Center Foundation IncFrostburg | Form 990 | $625,314FY2025 |
| Ecolatinos IncCollege Park | Form 990 | $594,596FY2024 |
| Back River Restoration Committee IncBaltimore | Form 990 | $591,647FY2025 |
| Harford Land Trust IncBel Air | Form 990 | $558,171FY2025 |
| Solutions from the LandLutherville-Timonium | Form 990 | $553,586FY2025 |
| Chesapeake Conservation Landscaping Council IncRidgely | Form 990 | $542,975FY2024 |
| Catoctin Land Trust IncFrederick | Form 990 | $530,672FY2025 |
| Chesapeake Stormwater Network IncCatonsville | Form 990 | $511,702FY2025 |
| Neighbor Space of Baltimore CountyLutherville | Form 990 | $494,713FY2025 |
| Fair Hill Environmental Foundation IncElkton | Form 990 | $491,484FY2025 |
| Solar Freeze IncHyattsville | Form 990 | $435,900FY2024 |
| Gunpowder Riverkeeper IncMonkton | Form 990 | $431,484FY2024 |
| Association for Nature -Based Education IncGlen Arm | Form 990 | $416,057FY2025 |
| Fox Haven CenterJefferson | Form 990 | $410,766FY2024 |
| Climate Access Fund CorporationBaltimore | Form 990 | $406,076FY2025 |
| Roland Park Community Foundation IncBaltimore | Form 990 | $385,955FY2024 |
| Land and Cultural Preservation Fund IncWalkersville | Form 990 | $382,433FY2024 |
| Izaak Walton League of America IncDamascus | Form 990 | $355,188FY2024 |
| Species Survival NetworkHighland | Form 990 | $346,428FY2024 |
| Bethesda GreenBethesda | Form 990 | $341,433FY2024 |
| Waterkeepers Chesapeake IncSilver Spring | Form 990 | $312,302FY2025 |
| Assateague Coastal Trust IncBerlin | Form 990 | $309,462FY2025 |
| St Marys River Watershed Association IncSaint Marys City | Form 990 | $301,440FY2025 |
| One Montgomery Green IncSilver Spring | Form 990 | $292,551FY2025 |
| Friskys Wildlife & Primate Sanctuary IncWoodstock | Form 990 | $291,729FY2024 |
| Ocean Research Project IncAnnapolis | Form 990 | $267,950FY2025 |
| Izaak Walton League of America IncGermantown | Form 990 | $264,764FY2025 |
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