| Thurmont Little League IncThurmont | Form 990-EZ | $101,253FY2025 |
| Amateur Athletic Union of the United StatesBaltimore | Form 990-EZ | $101,117FY2025 |
| PTA Delaware CongressBethesda | Form 990-EZ | $100,082FY2025 |
| Home Assist IncOdenton | Form 990-EZ | $99,638FY2025 |
| Middle River Recreation & Park CouncilMiddle River | Form 990-EZ | $99,580FY2023 |
| The Society for the Preservation of Federal Hill and Fells Point IncBaltimore | Form 990 | $99,578FY2024 |
| Unstoppable Joy CoBerlin | Form 990-EZ | $99,351FY2024 |
| Society of St Vincent de Paul Baltimore Council IncSykesville | Form 990-EZ | $99,263FY2025 |
| American College of PhysiciansBaltimore | Form 990-EZ | $98,722FY2025 |
| The Independent Volunteer Firmens Assn of Ritchie MD IncCapitol Heights | Form 990 | $98,412FY2024 |
| Crime Solvers of Prince Georges County MD IncUpper Marlboro | Form 990-EZ | $98,178FY2025 |
| Athletic Boosters for Westminster High School IncWestminster | Form 990-EZ | $97,669FY2024 |
| Little League Baseball IncHavre de Grace | Form 990-EZ | $97,141FY2024 |
| Brotherhood of the Jungle Cock IncReisterstown | Form 990-EZ | $96,719FY2025 |
| Susquehanna Symphony Orchestra IncAbingdon | Form 990-EZ | $96,061FY2025 |
| Inspiration Community IncOwings Mills | Form 990-EZ | $95,858FY2024 |
| Box 414 Association IncBaltimore | Form 990 | $95,787FY2024 |
| Western Maryland Railway Historical Society IncorporatedUnion Bridge | Form 990 | $94,883FY2025 |
| Institute for Energy & Environmental ResearchBethesda | Form 990-EZ | $94,497FY2025 |
| Bowie Alumni AssociationBowie | Form 990-EZ | $94,196FY2025 |
| Little League Baseball IncBerlin | Form 990-EZ | $92,942FY2025 |
| Vigilant Hose Company Auxiliary IncEmmitsburg | Form 990-EZ | $91,693FY2024 |
| Meals on Wheels of Wheaton IncKensington | Form 990-EZ | $90,521FY2025 |
| Southern Asia Adventist Association IncSilver Spring | Form 990 | $89,239FY2025 |
| Rotary Club of Columbia Patuxent Charitable TrustColumbia | Form 990-EZ | $88,347FY2025 |
| PTA Delaware CongressSykesville | Form 990-EZ | $87,764FY2025 |
| PTA Delaware CongressFulton | Form 990-EZ | $86,676FY2025 |
| Kent Association for Riding Therapy IncWorton | Form 990-EZ | $86,451FY2024 |
| Little League Baseball IncWilliamsport | Form 990-EZ | $85,900FY2025 |
| CBM Ministries of MDUpperco | Form 990-EZ | $85,738FY2025 |
| Rosaria Communities in Montgomery County IncOlney | Form 990 | $85,436FY2025 |
| PTA Delaware CongressFallston | Form 990-EZ | $85,137FY2025 |
| Interdenominational Church Ushers Association of Maryland IncGlen Burnie | Form 990-EZ | $84,897FY2024 |
| Baltimore Community Kollel for Mechanchim IncBaltimore | Form 990-EZ | $84,746FY2024 |
| Mildred Mindell Foundation IncOwings Mills | Form 990-EZ | $84,429FY2025 |
| Baltimore City College Alumni Association IncBaltimore | Form 990-EZ | $84,129FY2025 |
| American Society for Reconstructive TransplantationTowson | Form 990-EZ | $84,105FY2024 |
| Easton Choral Arts Society IncEaston | Form 990-EZ | $84,003FY2025 |
| Mount Hope IncorporatedHagerstown | Form 990 | $83,834FY2025 |
| The United States Pony Club IncHollywood | Form 990-EZ | $83,604FY2025 |
| Baltimore County Historical Society IncCockeysville | Form 990-EZ | $83,313FY2025 |
| United Way of Queen Annes County Maryland IncChester | Form 990-EZ | $83,163FY2025 |
| Fairland Girls Booster Club IncLaurel | Form 990-EZ | $82,506FY2023 |
| The Next Ice AgeBaltimore | Form 990-EZ | $82,419FY2026 |
| Olde Mill Band Boosters Association IncMillersville | Form 990-EZ | $82,267FY2024 |
| Fiddle Puppet Dancers IncCrownsville | Form 990-EZ | $82,195FY2024 |
| PTA Delaware CongressGambrills | Form 990-EZ | $80,012FY2026 |
| Montgomery County Swim League IncGermantown | Form 990-EZ | $79,719FY2024 |
| Mattawoman Creek Art Center IncMarbury | Form 990-EZ | $79,514FY2025 |
| Maryland Creative Problem Solvers IncWaldorf | Form 990-EZ | $78,899FY2025 |