| Transatlantic Leadership NetworkWashington | Form 990 | $697,265FY2025 |
| Center for the Study of Organized Hate IncWashington | Form 990 | $655,076FY2025 |
| Society of Black ArchaeologistsWashington | Form 990 | $462,392FY2025 |
| Institute for Research Middle Eastern Policy IncWashington | Form 990 | $394,778FY2025 |
| Yorktown Foundation for FreedomWashington | Form 990 | $380,000FY2024 |
| Secular Coalition for America Education FundWashington | Form 990 | $374,466FY2024 |
| National Association of Multicultural EducationWashington | Form 990 | $329,479FY2025 |
| State Tax Research InstituteWashington | Form 990 | $269,000FY2024 |
| CelsiusWashington | Form 990 | $248,805FY2024 |
| Levant Center for Strategic StudiesWashington | Form 990 | $216,565FY2024 |
| Sadie CollectiveWashington | Form 990-EZ | $197,430FY2025 |
| National Center for Health Research IncorporatedWashington | Form 990 | $189,063FY2024 |
| The Historical Society of the District of Columbia CircuitWashington | Form 990-EZ | $158,094FY2024 |
| Pupin InitiativeWashington | Form 990-EZ | $127,046FY2025 |
| American Institute for Yemeni StudiesWashington | Form 990 | $97,886FY2025 |
| International Telecommunications SocietyWashington | Form 990-EZ | $86,385FY2025 |
| Green Bag IncWashington | Form 990-EZ | $78,880FY2025 |
| Foundation for Workforce MobilityWashington | Form 990-N | No figure |
| World Anthropological UnionWashington | Form 990-N | No figure |
| Genesis InstituteWashington | Form 990-N | No figure |
| Millennium Project CorporationWashington | Form 990-N | No figure |
| Actright Educational Trust FundWashington | Form 990-N | No figure |
| Institute for Ai Policy and Strategy IncWashington | Form 990-N | No figure |
| Program Integrity AllianceWashington | Form 990-N | No figure |
| Association for Ethnic Studies IncWashington | Form 990-N | No figure |
| National Security Division AssociationWashington | Form 990-N | No figure |
| Women on ChangeWashington | Form 990-N | No figure |
| Rule of Law InstituteWashington | Form 990-N | No figure |
| National Capital Area Political Science AssociationWashington | Form 990-N | No figure |
| The Council for Social and Economic Studies IncWashington | Form 990-N | No figure |
| Student Pugwash USAWashington | Form 990-N | No figure |
| Washington Foundation for European StudiesWashington | Form 990-N | No figure |
| Paleoanthropology SocietyWashington | Form 990-N | No figure |
| American Psychological AssociationWashington | Form 990 | $0FY2024 |
| Savings and Retirement FoundationWashington | Form 990-N | No figure |
| American Democracy Month CouncilWashington | Form 990-N | No figure |
| LJC Group LtdWashington | Form 990-N | No figure |
| Alternative Planetary Futures InstituteWashington | Form 990-N | No figure |
| Caucus for a Critical Political ScienceWashington | Form 990-N | No figure |
| Vielmontgomery Foundation IncWashington | Form 990-N | No figure |
| Doctors of DemocracyWashington | Form 990-N | No figure |
| Institute for Applied HumanismWashington | Form 990-N | No figure |
| Empowerjustice CorpWashington | Form 990-N | No figure |
| International Association for Research in Income and WealthWashington | Form 990 or 990-EZ | No figure |
| Food Security Leadership CouncilWashington | Form 990 or 990-EZ | No figure |
| The Zhong Institute IncWashington | Form 990-N | No figure |
| Connected Practice ExchangeWashington | Form 990 or 990-EZ | No figure |
| Ellis Cemetery PreservationWashington | Form 990-N | No figure |
| Woodrow Wilson International Center for ScholarsWashington | Form 990 or 990-EZ | No figure |
| Institute for Intercultural Relations IncorporatedWashington | None required | No figure |