| University of Maryland Family Medicine Associates PaBaltimore | Form 990 | $13,879,950FY2025 |
| Shura IncWoodlawn | Form 990 | $13,276,631FY2025 |
| Rock Creek Foundation for Mental Health IncSilver Spring | Form 990 | $13,009,590FY2025 |
| University of Maryland Neurology Associates PaBaltimore | Form 990 | $12,276,171FY2025 |
| Federation of American Societies for Experimental BiologyRockville | Form 990 | $12,209,532FY2024 |
| The Association for Research in Vision and OphthalmologyRockville | Form 990 | $12,169,218FY2025 |
| Boy Scouts of AmericaBethesda | Form 990 | $12,153,826FY2025 |
| Gateway Maryland IncBaltimore | Form 990 | $11,722,285FY2025 |
| For All Seasons IncEaston | Form 990 | $11,235,782FY2025 |
| United States Naval InstituteAnnapolis | Form 990 | $10,963,609FY2024 |
| American Society of Human GeneticsRockville | Form 990 | $10,714,126FY2025 |
| Asi Missions IncColumbia | Form 990 | $10,240,308FY2024 |
| University of Maryland Psychiatry Associates P ABaltimore | Form 990 | $10,072,971FY2025 |
| Calleva IncPoolesville | Form 990 | $9,460,101FY2024 |
| National Fallen Firefighters FoundationEmmitsburg | Form 990 | $9,315,995FY2024 |
| Pact Helping Children with Special Needs IncBaltimore | Form 990 | $9,301,627FY2025 |
| Robert a Pascal Youth & Family Services IncOdenton | Form 990 | $9,301,165FY2025 |
| National Plastering Industrys Joint Apprenticeship Trust FundColumbia | Form 990 | $9,108,738FY2025 |
| Oyster Recovery Partnership IncAnnapolis | Form 990 | $8,815,883FY2025 |
| Luminis Health Gilchrist Lifecare Institute LLCAnnapolis | Form 990 | $8,768,492FY2025 |
| Maryland Philanthropy Network IncBaltimore | Form 990 | $8,637,289FY2024 |
| Community Support Services for the Deaf IncBaltimore | Form 990 | $8,561,900FY2025 |
| Opportunities IncLanham | Form 990 | $8,384,073FY2025 |
| Collegebound Foundation IncBaltimore | Form 990 | $8,367,261FY2025 |
| American Youth Hostels IncSilver Spring | Form 990 | $8,214,759FY2025 |
| Compass Regional Hospice IncCentreville | Form 990 | $8,148,198FY2024 |
| Jewish Camp and Conference Service IncRockville | Form 990 | $7,940,570FY2024 |
| Center for Effective Public PolicyKensington | Form 990 | $7,901,452FY2025 |
| Center for Life Enrichment IncHollywood | Form 990 | $7,718,594FY2025 |
| Bay Shore Services IncSalisbury | Form 990 | $7,504,478FY2025 |
| West Baltimore Renaissance Foundation IncBaltimore | Form 990 | $7,449,226FY2025 |
| Caroline Center IncRidgely | Form 990 | $7,100,794FY2025 |
| American Society for Cell BiologyRockville | Form 990 | $7,068,106FY2024 |
| Mac IncorporatedSalisbury | Form 990 | $7,015,893FY2025 |
| Make-a-Wish Foundation of the Mid-Atlantic IncBethesda | Form 990 | $6,941,928FY2025 |
| Biomedical Research InstituteRockville | Form 990 | $6,920,488FY2025 |
| Prologue IncPikesville | Form 990 | $6,581,084FY2024 |
| Center for Children IncLa Plata | Form 990 | $6,566,201FY2024 |
| Rabbi Chaim Nachman Kowalsky Memorial Ahavas Yisrael Fund IncBaltimore | Form 990 | $6,371,175FY2024 |
| Habitat for Humanity Choptank IncTrappe | Form 990 | $6,178,926FY2025 |
| Save a Childs Heart Foundation Us IncRockville | Form 990 | $6,050,217FY2024 |
| Fairfax Education Association Retirement Housing CorporationChevy Chase | Form 990 | $6,014,988FY2024 |
| American Society of Plant BiologistsRockville | Form 990 | $5,909,625FY2024 |
| Genetics Society of America IncorporatedRockville | Form 990 | $5,909,178FY2024 |
| The Family Tree IncBaltimore | Form 990 | $5,865,560FY2025 |
| Autism Society of America IncRockville | Form 990 | $5,787,388FY2024 |
| Council on Quality & Leadership in Supports for People with DisabilitTowson | Form 990 | $5,669,023FY2024 |
| National Capital Bnai Brith Housing Foundation IncSilver Spring | Form 990 | $5,579,243FY2025 |
| Three Oaks Homeless Shelter IncLexington Park | Form 990 | $5,490,740FY2025 |
| Community Legal Services of Prince Georges County IncGreenbelt | Form 990 | $5,435,419FY2025 |