| American Institutes for Research in the Behavioral SciencesArlington | Form 990 | $437,187,471FY2024 |
| Human Resources Research OrganizationAlexandria | Form 990 | $69,540,238FY2025 |
| Mercatus Center IncArlington | Form 990 | $48,287,301FY2025 |
| Atlas Economic Research FoundationArlington | Form 990 | $28,834,435FY2025 |
| United States Geospatial Intelligence FoundationHerndon | Form 990 | $7,559,866FY2025 |
| American Conservative Union FoundationAlexandria | Form 990 | $7,147,796FY2025 |
| American Anthropological AssociationArlington | Form 990 | $6,107,366FY2025 |
| Americans for Prosperity FoundationArlington | Form 990 | $4,378,810FY2024 |
| Negative Population Growth IncAlexandria | Form 990 | $2,749,615FY2025 |
| Society for Personality Assessment FoundationFalls Church | Form 990 | $2,302,702FY2024 |
| American Society of Overseas ResearchAlexandria | Form 990 | $1,879,670FY2025 |
| Population Research Institute IncFront Royal | Form 990 | $1,479,306FY2025 |
| The Institute for Global Environmental Strategies IncArlington | Form 990 | $1,289,172FY2025 |
| Society for Psychophysiological Research IncMcLean | Form 990 | $799,062FY2025 |
| Virginia Council on Economic EducationRichmond | Form 990 | $781,567FY2025 |
| Society for Prevention Research IncorporatedFairfax | Form 990 | $770,724FY2024 |
| Institute for State Policy LeadersArlington | Form 990 | $751,071FY2023 |
| Employment Policies Institute FoundationArlington | Form 990 | $722,742FY2025 |
| Motivational Interviewing Network of Trainers IncorporatedFairfax | Form 990 | $623,327FY2024 |
| Consortium of Social Science AssociationsAlexandria | Form 990 | $611,014FY2023 |
| International Freedom Educational FoundationMcLean | Form 990 | $446,990FY2024 |
| The Thriving Cities GroupElkton | Form 990 | $377,188FY2025 |
| Feminist Studies IncRichmond | Form 990 | $349,031FY2025 |
| Liams Chance Behavioral Services IncFront Royal | Form 990 | $320,054FY2024 |
| Project InvestAlexandria | Form 990 | $311,695FY2025 |
| Womens Institute for Science Equity and RaceMechanicsville | Form 990 | $265,131FY2024 |
| Virginia Civics Education IncorporatedCulpeper | Form 990 | $200,542FY2023 |
| Naples Roundtable IncAlexandria | Form 990-EZ | $189,328FY2024 |
| Your Economic SuccessHarrisonburg | Form 990 | $170,191FY2026 |
| Functional Behavior Interventions for All IncMidland | Form 990-EZ | $137,082FY2023 |
| Association of Population CentersAlexandria | Form 990-EZ | $103,733FY2023 |
| International Association of Islamic Psychology IncorporatedReston | Form 990-EZ | $103,287FY2024 |
| House of Scientista IncMcLean | Form 990-EZ | $79,423FY2025 |
| G & L Behavior SolutionsHaymarket | Form 990-EZ | $76,955FY2025 |
| American Academy of Social Work and Social WelfareFairfax | Form 990-EZ | $74,811FY2024 |
| Natural Science Collections AllianceHerndon | Form 990-EZ | $67,015FY2024 |
| Institute for the Study of Man IncLeesburg | Form 990-EZ | $61,854FY2024 |
| Association of Muslim Social ScientistsArlington | Form 990-N | No figure |
| Actively Caring for PeopleNewport | Form 990-N | No figure |
| Coincidence ProjectCharlottesville | Form 990-N | No figure |
| BORDER911 Foundation IncFredericksburg | Form 990-N | No figure |
| Abusive Behavioral Syndrome Community Research ProjectArlington | Form 990-N | No figure |
| Martin Luther King Family Life CenterChesapeake | Form 990-N | No figure |
| Womens Freedom Forum IncTysons | Form 990-N | No figure |
| Abettersocietyinfo IncSuffolk | Form 990-N | No figure |
| Centre for Spatial Law and PolicyArlington | Form 990-N | No figure |
| Decoder Health UsonjiAldie | Form 990-N | No figure |
| Care for Assets Resources and ObligationsFalls Church | Form 990-N | No figure |
| Foundation for Campaign InnovationAlexandria | Form 990-N | No figure |
| Integrative Centers for Science and Medicine IncMartinsville | Form 990-N | No figure |