| League of Conservation Voters Education FundEIN 52-1379661 | Environment | DC | $18,493,698Large | 92.02 |
| League of Women Voters Education FundEIN 53-0239013 | Human and Civil Rights | DC | $2,592,235Small | 74.42 |
| Legal Aid Society of the District of ColumbiaEIN 53-0196600 | Human and Civil Rights | DC | $5,594,783Mid-sized | 99.46 |
| LGBTQ Victory InstituteEIN 52-1835268 | Human and Civil Rights | DC | $2,665,828Small | 81.71 |
| LIFTEIN 52-2168409 | Human Services | DC | $5,586,830Mid-sized | 79.56 |
| Little Sisters of the Poor of Washington, DCEIN 53-0227542 | Human Services | DC | $9,711,423Mid-sized | 81.54 |
| Lung Cancer AllianceEIN 91-1821040 | Health | DC | $3,992,235Mid-sized | 82.85 |
| Lupus Foundation of AmericaEIN 43-1131436 | Health | DC | $13,256,140Mid-sized | 72.88 |
| Marijuana Policy Project FoundationEIN 52-1975211 | Research and Public Policy | DC | $2,866,841Small | 77.62 |
| Martha's TableEIN 52-1186071 | Human Services | DC | $12,419,059Mid-sized | 97.13 |
| Mary's CenterEIN 52-1594116 | Human Services | DC | $46,327,345Large | 93.76 |
| Media Matters for AmericaEIN 47-0928008 | Research and Public Policy | DC | $10,867,830Mid-sized | 75.10 |
| Melanoma Research FoundationEIN 76-0514428 | Health | DC | $6,018,441Mid-sized | 80.00 |
| Men's Health NetworkEIN 52-1855419 | Health | DC | $805,645Small | 80.30 |
| Mesothelioma Applied Research FoundationEIN 75-2816066 | Health | DC | $2,190,623Small | 89.12 |
| Middle East InstituteEIN 53-0204608 | International | DC | $5,814,897Mid-sized | 97.12 |
| Migration Policy InstituteEIN 52-2279789 | International | DC | $6,001,797Mid-sized | 91.90 |
| Minority Corporate Counsel AssociationEIN 13-3920905 | Human and Civil Rights | DC | $2,948,017Small | 91.16 |
| Miriam's KitchenEIN 52-1331552 | Human Services | DC | $4,421,295Mid-sized | 92.92 |
| My Sister's PlaceEIN 52-1263256 | Human Services | DC | $1,983,322Small | 90.63 |
| N Street VillageEIN 52-1007373 | Human Services | DC | $7,693,664Mid-sized | 93.54 |
| NAFSA: Association of International EducatorsEIN 13-1878953 | International | DC | $21,484,112Large | 85.07 |
| NARAL Pro-Choice America FoundationEIN 52-1100361 | Human and Civil Rights | DC | $7,808,947Mid-sized | 96.66 |
| National Abortion FederationEIN 43-1097957 | Human and Civil Rights | DC | $7,494,407Mid-sized | 96.66 |
| National Academy of Engineering FundEIN 23-7284092 | Research and Public Policy | DC | $9,369,619Mid-sized | 80.56 |
| National Alliance to End HomelessnessEIN 52-1299641 | Human Services | DC | $4,134,436Mid-sized | 91.42 |
| National Archives FoundationEIN 52-1792608 | Arts, Culture, Humanities | DC | $4,613,118Mid-sized | 80.67 |
| National Breast Cancer Coalition FundEIN 52-1782065 | Health | DC | $3,232,303Small | 85.46 |
| National Building MuseumEIN 52-1050999 | Arts, Culture, Humanities | DC | $6,830,990Mid-sized | 80.74 |
| National Center for Public Policy ResearchEIN 52-1226614 | Human and Civil Rights | DC | $4,829,357Mid-sized | 66.88 |
| National Center for Transgender EqualityEIN 41-2090291 | Human and Civil Rights | DC | $1,632,740Small | 83.37 |
| National Coalition Supporting Eurasian JewryEIN 13-2700517 | Religion | DC | $899,137Small | 74.50 |
| National Coalition to Abolish the Death PenaltyEIN 23-2290483 | Human and Civil Rights | DC | $521,188Small | 64.91 |
| National College Access NetworkEIN 31-1793562 | Education | DC | $4,051,455Mid-sized | 88.22 |
| National Consumers LeagueEIN 53-0242038 | Research and Public Policy | DC | $2,349,962Small | 86.45 |
| National Council on US-Arab RelationsEIN 52-1296502 | International | DC | $1,630,801Small | 94.34 |
| 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 Environmental Education FoundationEIN 54-1557043 | Environment | DC | $3,621,403Mid-sized | 90.40 |
| National Family Planning & Reproductive Health AssociationEIN 23-7323629 | Human and Civil Rights | DC | $4,644,303Mid-sized | 90.28 |
| National Fish and Wildlife FoundationEIN 52-1384139 | Animals | DC | $302,313,179Large | 90.94 |
| National Fragile X FoundationEIN 84-0960471 | Health | DC | $1,654,106Small | 89.19 |
| National Gallery of ArtEIN 53-6001666 | Arts, Culture, Humanities | DC | $185,897,169Large | 88.54 |
| National Guard Youth FoundationEIN 54-1940978 | Education | DC | $839,227Small | 79.95 |
| National Health Law ProgramEIN 95-3080947 | Human and Civil Rights | DC | $6,046,995Mid-sized | 91.32 |
| National Immigration ForumEIN 13-1776711 | Human and Civil Rights | DC | $5,252,897Mid-sized | 94.07 |
| National Iranian American CouncilEIN 73-1626026 | Human and Civil Rights | DC | $997,845Small | 76.74 |
| National Law Center on Homelessness and PovertyEIN 52-1633883 | Human Services | DC | $1,059,806Small | 81.29 |
| National LGBTQ Task ForceEIN 52-1624852 | Human and Civil Rights | DC | $7,286,554Mid-sized | 78.51 |
| National Low Income Housing CoalitionEIN 52-1089824 | Human and Civil Rights | DC | $3,160,313Small | 91.78 |
| National Minority AIDS CouncilEIN 52-1578289 | Health | DC | $5,714,211Mid-sized | 90.86 |
| National Museum of Women in the ArtsEIN 52-1238810 | Arts, Culture, Humanities | DC | $9,670,306Mid-sized | 83.56 |
| National Network to End Domestic ViolenceEIN 52-1973408 | Human Services | DC | $4,157,632Mid-sized | 92.24 |
| National Park FoundationEIN 52-1086761 | Environment | DC | $70,306,163Large | 91.50 |
| National Parks Conservation AssociationEIN 53-0225165 | Environment | DC | $31,688,823Large | 82.54 |
| National Partnership for Women & FamiliesEIN 23-7124915 | Human and Civil Rights | DC | $8,597,541Mid-sized | 88.43 |
| National Peace Corps AssociationEIN 58-1431113 | International | DC | $1,597,028Small | 84.47 |
| National Right to Life Educational Trust FundEIN 52-1241126 | Human and Civil Rights | DC | $1,940,569Small | 70.05 |
| National Skills CoalitionEIN 30-0075580 | Research and Public Policy | DC | $4,328,770Mid-sized | 89.39 |
| National Taxpayers Union FoundationEIN 52-1122683 | Human and Civil Rights | DC | $400,712Small | 87.53 |