| American Academy of Child & AdolesWashington | Form 990 | $14,305,810FY2025 |
| Center for Applied LinguisticsWashington | Form 990 | $14,147,065FY2025 |
| Progressive Life Center IncWashington | Form 990 | $13,804,459FY2025 |
| National Congress of American IndiansWashington | Form 990 | $13,169,834FY2024 |
| National Museum of Women in the Arts IncWashington | Form 990 | $13,143,812FY2025 |
| The Society for Cariovascular Angiography and InterventionsWashington | Form 990 | $12,943,367FY2024 |
| Congressional Hispanic Caucus Institute IncWashington | Form 990 | $12,909,414FY2024 |
| Competitive Enterprise InstituteWashington | Form 990 | $12,854,082FY2025 |
| Gerontological Society of AmericaWashington | Form 990 | $12,696,945FY2025 |
| Abraham and Laura Lisner Home for Aged WomenWashington | Form 990 | $12,632,198FY2024 |
| NRF FoundationWashington | Form 990 | $12,476,331FY2026 |
| National Resident Matching ProgramWashington | Form 990 | $12,471,691FY2024 |
| Robert F Kennedy Center for Justice and Human RightsWashington | Form 990 | $12,321,131FY2024 |
| Bright Beginnings IncWashington | Form 990 | $12,094,505FY2025 |
| Stoddard Baptist HomeWashington | Form 990 | $11,972,033FY2024 |
| American Immigration CouncilWashington | Form 990 | $11,940,088FY2024 |
| National Association of Counties Research FoundationWashington | Form 990 | $11,884,512FY2024 |
| Legal Counsel for the ElderlyWashington | Form 990 | $11,621,886FY2024 |
| Council of the Great City SchoolsWashington | Form 990 | $11,486,065FY2025 |
| The Third Way Foundation IncWashington | Form 990 | $11,297,128FY2025 |
| Center for Health Policy DevelopmentWashington | Form 990 | $10,917,630FY2024 |
| Lulac National Educational Service Centers IncWashington | Form 990 | $10,793,732FY2025 |
| Council for Opportunity in EducationWashington | Form 990 | $10,683,115FY2025 |
| Securing Americas Future Energy FoundationWashington | Form 990 | $10,680,449FY2024 |
| National Center for Public Policy Research IncWashington | Form 990 | $10,583,398FY2025 |
| Association of Community College TrusteesWashington | Form 990 | $10,536,231FY2025 |
| N Street Village IncWashington | Form 990 | $10,490,546FY2025 |
| National Indian Health BoardWashington | Form 990 | $10,358,971FY2024 |
| National League for Nursing IncWashington | Form 990 | $10,286,150FY2024 |
| American Health Law AssociationWashington | Form 990 | $10,162,488FY2025 |
| National Disability Rights Network IncWashington | Form 990 | $10,115,194FY2025 |
| National Association of Housing & Redevelopment OfficialsWashington | Form 990 | $9,718,325FY2025 |
| National Fair Housing AllianceWashington | Form 990 | $9,485,092FY2025 |
| International Association for the Study of PainWashington | Form 990 | $9,290,862FY2024 |
| American Medical Informatics Association IncWashington | Form 990 | $9,126,107FY2024 |
| National Council on Problem Gambling IncWashington | Form 990 | $9,061,174FY2024 |
| LT Joseph P Kennedy InstituteWashington | Form 990 | $8,998,133FY2025 |
| Manufacturing InstituteWashington | Form 990 | $8,840,593FY2024 |
| Reagan-Udall Foundation for the Food and Drug AdministrationWashington | Form 990 | $8,703,093FY2025 |
| The Economic Club of Washington DCWashington | Form 990 | $8,625,798FY2025 |
| Cancer Support CommunityWashington | Form 990 | $8,585,153FY2024 |
| Advocates for YouthWashington | Form 990 | $8,401,820FY2025 |
| Phi Beta Kappa SocietyWashington | Form 990 | $8,332,833FY2025 |
| My Sisters Place IncWashington | Form 990 | $8,284,888FY2025 |
| National Association of Independent Colleges & UniversitiesWashington | Form 990 | $8,263,475FY2025 |
| Mathematical Association of America IncorporatedWashington | Form 990 | $7,984,952FY2024 |
| American Association of Tissue Banks IncWashington | Form 990 | $7,958,410FY2025 |
| Public Health FoundationWashington | Form 990 | $7,865,581FY2025 |
| HumentumWashington | Form 990 | $7,753,593FY2025 |
| National Council of University Research AdministratorsWashington | Form 990 | $7,595,831FY2025 |