| 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 Employment Law ProjectEIN 13-2758558 | Research and Public Policy | NY | $8,569,143Mid-sized | 92.22 |
| National Humanities CenterEIN 59-1735367 | Research and Public Policy | NC | $5,231,657Mid-sized | 88.57 |
| National Institute on Money in State PoliticsEIN 81-0526651 | Research and Public Policy | MT | $1,891,674Small | 94.78 |
| National Skills CoalitionEIN 30-0075580 | Research and Public Policy | DC | $4,328,770Mid-sized | 89.39 |
| NCSL Foundation for State LegislaturesEIN 74-2232576 | Research and Public Policy | CO | $3,158,402Small | 80.44 |
| Negative Population GrowthEIN 46-4868482 | Research and Public Policy | VA | $816,014Small | 78.66 |
| NEO PhilanthropyEIN 13-3191113 | Research and Public Policy | NY | $45,086,138Large | 92.16 |
| New AmericaEIN 52-2096845 | Research and Public Policy | DC | $37,245,071Large | 95.23 |
| New Economy CoalitionEIN 03-0278626 | Research and Public Policy | MA | $1,317,133Small | 83.34 |
| New York Academy of SciencesEIN 13-1773640 | Research and Public Policy | NY | $23,915,742Large | 78.38 |
| New York Public Interest Research Group FundEIN 13-2876109 | Research and Public Policy | NY | $4,153,765Mid-sized | 78.50 |
| North Carolina Justice CenterEIN 56-1348186 | Research and Public Policy | NC | $4,885,900Mid-sized | 90.60 |
| Northeast Organic Farming Association of VermontEIN 22-3260420 | Research and Public Policy | VT | $2,037,290Small | 92.20 |
| Oklahoma Council of Public AffairsEIN 73-1436375 | Research and Public Policy | OK | $2,173,852Small | 75.57 |
| Oldways Preservation TrustEIN 04-3031978 | Research and Public Policy | MA | $2,135,083Small | 85.00 |
| Organic Farming Research FoundationEIN 77-0252545 | Research and Public Policy | CA | $871,992Small | 87.24 |
| Pacific Research InstituteEIN 94-2528433 | Research and Public Policy | CA | $6,339,545Mid-sized | 79.47 |
| Partnership for Public ServiceEIN 06-1540513 | Research and Public Policy | DC | $16,330,799Large | 96.46 |
| People for BikesEIN 20-4306888 | Research and Public Policy | CO | $2,410,168Small | 75.64 |
| Peterson Institute for International EconomicsEIN 52-1226967 | Research and Public Policy | DC | $14,090,558Large | 92.29 |
| Pioneer InstituteEIN 22-2632081 | Research and Public Policy | MA | $2,124,432Small | 91.51 |
| PolicyLinkEIN 94-3297479 | Research and Public Policy | CA | $12,167,006Mid-sized | 88.22 |
| Population Reference BureauEIN 53-0214030 | Research and Public Policy | DC | $9,157,354Mid-sized | 89.86 |
| Population Research InstituteEIN 54-1819935 | Research and Public Policy | VA | $1,368,353Small | 62.84 |
| Produce for Better Health FoundationEIN 51-0334897 | Research and Public Policy | MO | $2,263,416Small | 86.85 |
| Public AgendaEIN 13-2847587 | Research and Public Policy | NY | $5,183,544Mid-sized | 91.07 |
| Public KnowledgeEIN 52-2336690 | Research and Public Policy | DC | $2,837,102Small | 88.10 |
| RAND CorporationEIN 95-1958142 | Research and Public Policy | CA | $339,414,517Large | 83.79 |
| Reason FoundationEIN 95-3298239 | Research and Public Policy | CA | $12,379,098Mid-sized | 94.64 |
| Research!AmericaEIN 52-1609875 | Research and Public Policy | VA | $3,687,258Mid-sized | 80.61 |
| 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 |
| Roper Center for Public Opinion ResearchEIN 51-0173238 | Research and Public Policy | NY | $1,241,433Small | 87.25 |
| 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 |
| Santa Fe InstituteEIN 85-0325494 | Research and Public Policy | NM | $10,668,030Mid-sized | 84.43 |
| Securing America's Future EnergyEIN 20-1727977 | Research and Public Policy | DC | $6,080,643Mid-sized | 74.06 |
| SETI InstituteEIN 94-2951356 | Research and Public Policy | CA | $20,609,248Large | 87.01 |
| Sightline InstituteEIN 52-1833599 | Research and Public Policy | WA | $1,600,591Small | 91.66 |
| Social Venture PartnersEIN 91-1894424 | Research and Public Policy | WA | $2,722,955Small | 83.35 |
| SPUREIN 94-1498232 | Research and Public Policy | CA | $6,462,777Mid-sized | 88.07 |
| State Policy NetworkEIN 57-0952531 | Research and Public Policy | VA | $12,797,260Mid-sized | 88.07 |
| Supportive Housing Network of New YorkEIN 13-3755149 | Research and Public Policy | NY | $1,876,483Small | 87.00 |
| Tanenbaum Center for Interreligious UnderstandingEIN 13-3695475 | Research and Public Policy | NY | $1,992,629Small | 90.41 |
| Tax FoundationEIN 52-1703065 | Research and Public Policy | DC | $4,178,093Mid-sized | 84.96 |
| Texas Health InstituteEIN 74-2237787 | Research and Public Policy | TX | $2,357,814Small | 84.76 |
| Texas Public Policy FoundationEIN 74-2524057 | Research and Public Policy | TX | $8,681,038Mid-sized | 91.89 |
| The Aspen InstituteEIN 84-0399006 | Research and Public Policy | DC | $136,995,834Large | 94.32 |
| The Ayn Rand InstituteEIN 22-2570926 | Research and Public Policy | CA | $9,513,258Mid-sized | 76.96 |
| The Brookings InstitutionEIN 53-0196577 | Research and Public Policy | DC | $100,059,312Large | 83.36 |
| The Center for Democracy and TechnologyEIN 52-1905358 | Research and Public Policy | DC | $5,251,059Mid-sized | 86.38 |
| The Claremont InstituteEIN 95-3443202 | Research and Public Policy | CA | $5,093,063Mid-sized | 83.87 |
| The Council of State GovernmentsEIN 36-6000818 | Research and Public Policy | KY | $39,651,190Large | 80.51 |
| The Family FoundationEIN 52-1425355 | Research and Public Policy | VA | $1,066,485Small | 75.69 |
| The Federalist Society for Law and Public Policy StudiesEIN 36-3235550 | Research and Public Policy | DC | $18,233,577Large | 92.22 |
| The Georgia Center for OpportunityEIN 58-1928520 | Research and Public Policy | GA | $1,640,826Small | 94.69 |
| The Great Plains InstituteEIN 41-1921126 | Research and Public Policy | MN | $5,153,941Mid-sized | 96.97 |