| Actionaid USA | Washington | C | $1.77M |
| Advocates for Community Alternatives Inc | Washington | C | $1.19M |
| American Action Forum Inc | Washington | A | $4.44M |
| American Enterprise Institute for Public | Washington | C | $75.37M |
| American Institute for Boys and Men | Washington | C | $7.36M |
| American Institute for Yemeni Studies | Washington | D | $98K |
| American Political Science Association | Washington | C | $9.09M |
| American Psychological Association | Washington | A | $146.28M |
| American Psychological Foundation | Washington | C | $3.49M |
| American Sociological Association | Washington | B | $8.36M |
| American-German Institute Inc | Washington | C | $1.25M |
| Association for Clinical & Translational | Washington | A | $1.53M |
| Association of American Geographers | Washington | B | $6.78M |
| Behavioral Ideas Lab Inc | Washington | B | $10.96M |
| Better Markets Inc | Washington | B | $4.31M |
| Celsius Inc | Washington | D | $249K |
| Center for European Policy Analysis | Washington | B | $5.12M |
| Center for the Study of Organized Hate Inc | Washington | D | $655K |
| Coalition for a Prosperous America Education | Washington | C | $1.15M |
| Community Cooperative | Washington | B | $1.38M |
| Council on Governmental Relations | Washington | A | $3.33M |
| Economic Policy Innovation Center Inc | Washington | C | $2.66M |
| Economic Policy Institute | Washington | B | $17.42M |
| Foundation for Chemistry Research | Washington | D | $3.03M |
| Foundation for Workforce Mobility | Washington | C | $22K |
| Foundation of the Energy Law Journal | Washington | D | $152K |
| Genesis Institute | Washington | D | $16K |
| Globewomen Research & Education Institute | Washington | C | $1.54M |
| Green Bag Inc | Washington | B | $79K |
| Gulf International Forum Inc | Washington | B | $1.67M |
| Historical Society of the DC | Washington | C | $158K |
| Institute for Financial Markets | Washington | D | $527K |
| Institute for Palestine Studies (USA) | Washington | B | $920K |
| Institute for Progress | Washington | C | $1.08M |
| Institute for Research Middle Eastern Policy Inc | Washington | C | $395K |
| International Telecommunications Society | Washington | F | $86K |
| Joint Center for Political and Economic | Washington | C | $3.45M |
| Joseph Rainey Center for Public Policy | Washington | C | $2.58M |
| Knowledge Ecology International | Washington | C | $703K |
| Levant Center for Strategic Studies | Washington | D | $217K |
| National Association for Ethnic | Washington | B | $39K |
| National Association for Multicultural | Washington | A | $329K |
| National Center for Health Research Inc | Washington | C | $189K |
| National Council for Geocosmic Research Inc | Washington | C | $103K |
| National Institute of Statistical | Washington | B | $1.07M |
| National Labor College | Washington | D | $600K |
| Native American Finance | Washington | A | $3.10M |
| Our Neighborhoods Capital Fund | Washington | D | $1.56M |
| Peter G Peterson Institute for | Washington | D | $17.77M |
| Pew Research Center | Washington | B | $46.26M |
| Population Connection | Washington | B | $17.04M |
| Population Reference Bureau Inc | Washington | B | $11.42M |
| Poverty and Race Research Action Council | Washington | B | $810K |
| Pupin Initiative | Washington | C | $127K |
| Salzburg Global Seminar Inc | Washington | A | $16.47M |
| School Justice Project Inc | Washington | B | $1.69M |
| Secular Coalition for America Education Fund | Washington | D | $374K |
| Social Progress Imperative Inc | Washington | C | $1.13M |
| Society for Research in Child Development Inc | Washington | C | $7.37M |
| Society of Black Archaeologists | Washington | D | $462K |
| State Tax Research Institute | Washington | C | $269K |
| Student Pugwash USA | Washington | C | $345 |
| Synergia - Initiatives for Human Rights | Washington | B | $2.99M |
| The American Antitrust Institute Inc | Washington | C | $916K |
| The Aspen Institute Inc | Washington | C | $443.84M |
| The Becket Fund | Washington | C | $17.54M |
| The Brookings Institution | Washington | C | $115.66M |
| The Center for Employment Security | Washington | C | $49.38M |
| The Institute for Higher Education | Washington | C | $8.86M |
| The Sadie Collective | Washington | B | $197K |
| The Uli Foundation | Washington | C | $11.49M |
| The Urban Institute | Washington | B | $129.59M |
| Transatlantic Leadership Network | Washington | C | $697K |
| Washington Center for Equitable Growth | Washington | C | $11.97M |
| Washington Monthly Institute | Washington | C | $957K |
| Women's Congressional Policy Institute | Washington | A | $873K |
| Woodrow Wilson International Center | Washington | C | $30.38M |
| World Anthropological Union | Washington | D | $15K |
| Yorktown Foundation for Freedom | Washington | D | $380K |
Charity Clarity