| AAA Foundation for Traffic SafetyEIN 52-0794368 | Research and Public Policy | DC | $7,776,718Mid-sized | 92.02 |
| Alliance for Aging ResearchEIN 54-1379174 | Research and Public Policy | DC | $1,867,638Small | 89.69 |
| American Association for the Advancement of ScienceEIN 53-0196568 | Research and Public Policy | DC | $107,624,973Large | 87.49 |
| American Constitution Society for Law and PolicyEIN 52-2313694 | Research and Public Policy | DC | $5,891,120Mid-sized | 88.13 |
| American Council for an Energy-Efficient Economy EIN 94-2711707 | Research and Public Policy | DC | $9,400,072Mid-sized | 95.43 |
| American Enterprise Institute for Public Policy ResearchEIN 53-0218495 | Research and Public Policy | DC | $55,822,303Large | 87.22 |
| American Youth Policy ForumEIN 31-1576455 | Research and Public Policy | DC | $1,439,978Small | 91.69 |
| APhA FoundationEIN 52-6039142 | Research and Public Policy | DC | $1,640,653Small | 73.17 |
| Business Executives for National SecurityEIN 52-1271179 | Research and Public Policy | DC | $5,840,585Mid-sized | 91.72 |
| Capital Research CenterEIN 52-1289734 | Research and Public Policy | DC | $2,844,996Small | 76.58 |
| Carnegie Institution for ScienceEIN 53-0196523 | Research and Public Policy | DC | $100,297,805Large | 87.74 |
| Center for a New American SecurityEIN 20-8084828 | Research and Public Policy | DC | $9,751,151Mid-sized | 96.54 |
| Center for American ProgressEIN 30-0126510 | Research and Public Policy | DC | $46,765,901Large | 91.15 |
| Center for Economic and Policy ResearchEIN 52-2204029 | Research and Public Policy | DC | $1,990,467Small | 89.08 |
| Center for Food SafetyEIN 52-2165893 | Research and Public Policy | DC | $4,380,584Mid-sized | 85.99 |
| Center for Immigration StudiesEIN 52-1449368 | Research and Public Policy | DC | $2,816,435Small | 88.40 |
| Center for Public IntegrityEIN 54-1512177 | Research and Public Policy | DC | $5,208,118Mid-sized | 89.11 |
| Center for Science in the Public InterestEIN 23-7122879 | Research and Public Policy | DC | $12,565,933Mid-sized | 85.45 |
| Center for Strategic and Budgetary AssessmentsEIN 52-1930922 | Research and Public Policy | DC | $8,653,272Mid-sized | 84.06 |
| Center for the National InterestEIN 26-2117013 | Research and Public Policy | DC | $4,008,865Mid-sized | 89.04 |
| Center for Urban Renewal and EducationEIN 31-1467594 | Research and Public Policy | DC | $1,671,710Small | 78.59 |
| Center on Budget and Policy PrioritiesEIN 52-1234565 | Research and Public Policy | DC | $28,721,352Large | 90.53 |
| Clarion ProjectEIN 20-5845679 | Research and Public Policy | DC | $2,549,070Small | 63.65 |
| CLASPEIN 23-7000150 | Research and Public Policy | DC | $6,942,104Mid-sized | 95.42 |
| Communications Consortium Media CenterEIN 52-1524972 | Research and Public Policy | DC | $927,021Small | 79.49 |
| Congressional Black Caucus FoundationEIN 52-1160561 | Research and Public Policy | DC | $7,300,039Mid-sized | 89.01 |
| Constitutional Accountability CenterEIN 52-2063854 | Research and Public Policy | DC | $3,469,685Small | 91.86 |
| Council for a Strong AmericaEIN 13-3840271 | Research and Public Policy | DC | $11,660,559Mid-sized | 95.16 |
| Council for National PolicyEIN 72-0921017 | Research and Public Policy | DC | $2,680,790Small | 84.02 |
| Economic Policy InstituteEIN 52-1368964 | Research and Public Policy | DC | $6,502,386Mid-sized | 90.38 |
| Ethics and Public Policy CenterEIN 52-1162185 | Research and Public Policy | DC | $3,827,567Mid-sized | 89.98 |
| Families USA FoundationEIN 04-2730934 | Research and Public Policy | DC | $8,981,636Mid-sized | 82.60 |
| Family Online Safety InstituteEIN 52-2210323 | Research and Public Policy | DC | $1,588,755Small | 75.34 |
| Food Research & Action CenterEIN 23-7200739 | Research and Public Policy | DC | $11,894,182Mid-sized | 86.79 |
| Foundation for Defense of DemocraciesEIN 13-4174402 | Research and Public Policy | DC | $11,705,479Mid-sized | 89.22 |
| Hope Street GroupEIN 45-0497577 | Research and Public Policy | DC | $4,944,604Mid-sized | 80.75 |
| Institute for America's FutureEIN 52-1971942 | Research and Public Policy | DC | $2,915,846Small | 83.56 |
| Institute for Energy ResearchEIN 76-0149778 | Research and Public Policy | DC | $1,666,571Small | 89.48 |
| Institute for Local Self-RelianceEIN 23-7394104 | Research and Public Policy | DC | $1,525,548Small | 91.75 |
| Institute for Policy StudiesEIN 52-0788947 | Research and Public Policy | DC | $3,889,771Mid-sized | 94.21 |
| Institute for the Study of WarEIN 26-0273675 | Research and Public Policy | DC | $1,843,667Small | 81.77 |
| Institute for Women's Policy ResearchEIN 52-1549572 | Research and Public Policy | DC | $3,176,103Small | 86.79 |
| Institute on Taxation and Economic PolicyEIN 04-2688165 | Research and Public Policy | DC | $1,804,899Small | 93.91 |
| League of American BicyclistsEIN 36-6206225 | Research and Public Policy | DC | $1,587,429Small | 81.45 |
| Marijuana Policy Project FoundationEIN 52-1975211 | Research and Public Policy | DC | $2,866,841Small | 77.62 |
| Media Matters for AmericaEIN 47-0928008 | Research and Public Policy | DC | $10,867,830Mid-sized | 75.10 |
| National Academy of Engineering FundEIN 23-7284092 | Research and Public Policy | DC | $9,369,619Mid-sized | 80.56 |
| National Consumers LeagueEIN 53-0242038 | Research and Public Policy | DC | $2,349,962Small | 86.45 |
| National Cyber Security AllianceEIN 02-0629238 | Research and Public Policy | DC | $1,978,769Small | 85.09 |
| National Defense University FoundationEIN 52-1268692 | Research and Public Policy | DC | $495,880Small | 71.81 |
| National Skills CoalitionEIN 30-0075580 | Research and Public Policy | DC | $4,328,770Mid-sized | 89.39 |
| New AmericaEIN 52-2096845 | Research and Public Policy | DC | $37,245,071Large | 95.23 |
| Partnership for Public ServiceEIN 06-1540513 | Research and Public Policy | DC | $16,330,799Large | 96.46 |
| Peterson Institute for International EconomicsEIN 52-1226967 | Research and Public Policy | DC | $14,090,558Large | 92.29 |
| Population Reference BureauEIN 53-0214030 | Research and Public Policy | DC | $9,157,354Mid-sized | 89.86 |
| Public KnowledgeEIN 52-2336690 | Research and Public Policy | DC | $2,837,102Small | 88.10 |
| RESULTS Educational FundEIN 95-3747267 | Research and Public Policy | DC | $12,042,341Mid-sized | 92.82 |
| Robert F. Kennedy Human RightsEIN 13-2522784 | Research and Public Policy | DC | $7,359,062Mid-sized | 83.70 |
| Safe Kids WorldwideEIN 52-1627574 | Research and Public Policy | DC | $11,486,479Mid-sized | 89.78 |
| Salzburg Global SeminarEIN 04-2200147 | Research and Public Policy | DC | $8,340,061Mid-sized | 78.57 |