| National Trust for Historic PreservationEIN 53-0210807 | Arts, Culture, Humanities | DC | $48,392,459Large | 79.88 |
| National Wildlife Refuge AssociationEIN 23-7447365 | Animals | DC | $2,900,148Small | 81.02 |
| National Women's Law CenterEIN 52-1213010 | Human and Civil Rights | DC | $10,596,393Mid-sized | 92.29 |
| New AmericaEIN 52-2096845 | Research and Public Policy | DC | $37,245,071Large | 95.23 |
| NPREIN 52-0907625 | Arts, Culture, Humanities | DC | $222,910,067Large | 84.25 |
| Ocean ConservancyEIN 23-7245152 | Environment | DC | $23,984,534Large | 91.97 |
| OceanaEIN 51-0401308 | Environment | DC | $37,880,581Large | 94.11 |
| OutServe-SLDNEIN 52-1845000 | Human and Civil Rights | DC | $489,839Small | 86.77 |
| PAIEIN 52-0812075 | Human and Civil Rights | DC | $9,964,913Mid-sized | 99.18 |
| Paralyzed Veterans of AmericaEIN 13-1946868 | Human and Civil Rights | DC | $105,443,694Large | 72.57 |
| Partnership for Public ServiceEIN 06-1540513 | Research and Public Policy | DC | $16,330,799Large | 96.46 |
| Pax Christi USAEIN 36-3038894 | Religion | DC | $429,877Small | 69.78 |
| PeacePlayers InternationalEIN 52-2272092 | Human Services | DC | $3,113,168Small | 97.48 |
| PeerForwardEIN 52-2007028 | Education | DC | $7,527,116Mid-sized | 79.21 |
| People's ActionEIN 52-2214307 | Human and Civil Rights | DC | $494,258Small | 63.49 |
| Peterson Institute for International EconomicsEIN 52-1226967 | Research and Public Policy | DC | $14,090,558Large | 92.29 |
| PFLAGEIN 95-3750694 | Human and Civil Rights | DC | $2,849,515Small | 83.13 |
| Physicians for Social ResponsibilityEIN 23-7059731 | International | DC | $1,371,094Small | 83.07 |
| Pinchot Institute for ConservationEIN 52-1935342 | Environment | DC | $1,567,804Small | 77.83 |
| Planned Parenthood of Metropolitan Washington, DCEIN 53-0204621 | Health | DC | $11,025,180Mid-sized | 81.97 |
| PolarisEIN 03-0391561 | International | DC | $9,216,315Mid-sized | 98.04 |
| Population Reference BureauEIN 53-0214030 | Research and Public Policy | DC | $9,157,354Mid-sized | 89.86 |
| Power to DecideEIN 52-1974611 | Human Services | DC | $12,806,259Mid-sized | 91.21 |
| Prison Fellowship InternationalEIN 51-0247185 | Religion | DC | $6,323,282Mid-sized | 87.13 |
| Public Justice FoundationEIN 59-1730478 | Human and Civil Rights | DC | $4,042,339Mid-sized | 79.89 |
| Public KnowledgeEIN 52-2336690 | Research and Public Policy | DC | $2,837,102Small | 88.10 |
| Rails-To-Trails ConservancyEIN 52-1437006 | Environment | DC | $9,232,373Mid-sized | 90.68 |
| Rape, Abuse & Incest National NetworkEIN 52-1886511 | Human Services | DC | $6,409,790Mid-sized | 84.81 |
| Reading Is FundamentalEIN 52-0976257 | Education | DC | $6,969,506Mid-sized | 78.31 |
| REAL School GardensEIN 20-5946552 | Education | DC | $2,996,732Small | 92.14 |
| Rebuilding TogetherEIN 52-1585880 | Community Development | DC | $12,052,499Mid-sized | 91.81 |
| Religious Coalition for Reproductive ChoiceEIN 52-1213972 | Human and Civil Rights | DC | $1,405,840Small | 86.62 |
| Reporters Committee for Freedom of the PressEIN 52-0972043 | Human and Civil Rights | DC | $1,982,840Small | 91.90 |
| Resources for the FutureEIN 53-0220900 | Environment | DC | $13,755,089Large | 89.69 |
| 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 |
| Rock the VoteEIN 02-0767157 | Human and Civil Rights | DC | $6,204,786Mid-sized | 85.55 |
| Ronald McDonald House Charities of Greater Washington, DCEIN 52-1132262 | Health | DC | $3,306,024Small | 92.68 |
| Sabin Vaccine InstituteEIN 06-1389829 | Health | DC | $10,566,671Mid-sized | 89.39 |
| 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 |
| Samaritan InnsEIN 52-1474935 | Human Services | DC | $3,384,447Small | 97.66 |
| Samaritan Ministry of Greater WashingtonEIN 52-1434143 | Human Services | DC | $1,171,383Small | 92.80 |
| Securing America's Future EnergyEIN 20-1727977 | Research and Public Policy | DC | $6,080,643Mid-sized | 74.06 |
| Shakespeare Theatre CompanyEIN 52-1405988 | Arts, Culture, Humanities | DC | $21,930,518Large | 87.67 |
| Share Our StrengthEIN 52-1367538 | Human Services | DC | $51,056,766Large | 80.07 |
| SIECUSEIN 13-2508249 | Health | DC | $501,716Small | 86.71 |
| Sitar Arts CenterEIN 52-2113471 | Human Services | DC | $1,914,367Small | 88.36 |
| Sixth & IEIN 33-1036146 | Religion | DC | $3,489,232Small | 77.69 |
| Smith Center for Healing and the ArtsEIN 52-1977976 | Health | DC | $1,357,229Small | 89.35 |
| Society for Science & the PublicEIN 53-0196483 | Education | DC | $28,626,131Large | 97.23 |
| Society for Women's Health ResearchEIN 52-1694732 | Human and Civil Rights | DC | $1,749,602Small | 81.80 |
| Society of the CincinnatiEIN 53-0205423 | Arts, Culture, Humanities | DC | $4,196,909Mid-sized | 88.52 |
| SojournersEIN 23-7380554 | Religion | DC | $5,042,915Mid-sized | 81.65 |
| Solar Electric Light FundEIN 52-1701564 | International | DC | $4,497,399Mid-sized | 89.02 |
| SOMEEIN 23-7098123 | Human Services | DC | $28,344,473Large | 93.11 |
| Sons of Italy FoundationEIN 23-6276526 | Community Development | DC | $991,230Small | 77.48 |
| SOS Children's Villages-USAEIN 13-6188433 | International | DC | $10,446,173Mid-sized | 77.68 |
| Special OlympicsEIN 52-0889518 | Human Services | DC | $110,965,732Large | 90.49 |
| State VoicesEIN 20-1115618 | Human and Civil Rights | DC | $13,763,270Large | 94.07 |