| National Building MuseumEIN 52-1050999 | Arts, Culture, Humanities | DC | $6,830,990Mid-sized | 80.74 |
| National Bureau of Asian ResearchEIN 91-1444105 | Research and Public Policy | WA | $5,395,449Mid-sized | 81.05 |
| National Cat Protection SocietyEIN 95-2641531 | Animals | CA | $1,486,538Small | 67.78 |
| National Center for Families LearningEIN 61-1159549 | Education | KY | $6,510,923Mid-sized | 90.52 |
| National Center for FatheringEIN 48-1083848 | Human Services | AR | $1,715,568Small | 60.50 |
| National Center for Law and Economic JusticeEIN 23-7311208 | Human and Civil Rights | NY | $2,121,812Small | 83.20 |
| National Center for Learning DisabilitiesEIN 13-2899381 | Education | NY | $9,118,243Mid-sized | 95.47 |
| National Center for Lesbian RightsEIN 94-3086885 | Human and Civil Rights | CA | $4,861,287Mid-sized | 79.03 |
| National Center for Missing & Exploited ChildrenEIN 52-1328557 | Human and Civil Rights | VA | $40,446,536Large | 87.97 |
| National Center for Policy AnalysisEIN 75-1804932 | Research and Public Policy | TX | $3,263,918Small | 59.74 |
| National Center for Public Policy ResearchEIN 52-1226614 | Human and Civil Rights | DC | $4,829,357Mid-sized | 66.88 |
| National Center for Science EducationEIN 11-2656357 | Education | CA | $1,301,861Small | 81.29 |
| National Center for Transgender EqualityEIN 41-2090291 | Human and Civil Rights | DC | $1,632,740Small | 83.37 |
| National Center for Youth LawEIN 94-2506933 | Human and Civil Rights | CA | $6,884,801Mid-sized | 95.25 |
| National Child Safety CouncilEIN 38-6035290 | Human and Civil Rights | MI | $2,997,607Small | 82.12 |
| National Civil Rights MuseumEIN 58-1484027 | Arts, Culture, Humanities | TN | $9,276,122Mid-sized | 90.61 |
| National Coalition Against CensorshipEIN 13-3197949 | Human and Civil Rights | NY | $883,420Small | 95.93 |
| National Coalition Against Domestic ViolenceEIN 91-1081344 | Human and Civil Rights | CO | $1,085,257Small | 94.36 |
| National Coalition for Cancer SurvivorshipEIN 85-0357897 | Research and Public Policy | MD | $2,005,063Small | 78.86 |
| 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 Committee for the Furtherance of Jewish EducationEIN 11-6003180 | Religion | NY | $5,583,698Mid-sized | 78.70 |
| National Committee on United States-China RelationsEIN 13-2566973 | International | NY | $4,818,519Mid-sized | 85.18 |
| National Comprehensive Cancer NetworkEIN 23-2818395 | Health | PA | $26,864,032Large | 87.59 |
| National Constitution CenterEIN 23-2434447 | Arts, Culture, Humanities | PA | $19,805,976Large | 85.69 |
| National Consumer Law CenterEIN 04-2488502 | Human and Civil Rights | MA | $8,365,127Mid-sized | 90.64 |
| National Consumers LeagueEIN 53-0242038 | Research and Public Policy | DC | $2,349,962Small | 86.45 |
| National Council for the Traditional ArtsEIN 52-0847374 | Arts, Culture, Humanities | MD | $1,652,505Small | 92.02 |
| National Council of Jewish WomenEIN 13-1641076 | Human and Civil Rights | NY | $5,011,754Mid-sized | 86.53 |
| National Council of Jewish Women, Essex County SectionEIN 22-1687993 | Human Services | NJ | $1,260,272Small | 90.06 |
| National Council of Jewish Women, New York SectionEIN 13-1624132 | Human Services | NY | $1,739,702Small | 90.11 |
| National Council of the United States, Society of St. Vincent de PaulEIN 13-5562362 | Human Services | MO | $9,243,718Mid-sized | 82.00 |
| National Council of YMCAs of the USAEIN 36-3258696 | Human Services | IL | $136,856,789Large | 94.57 |
| National Council on AgingEIN 13-1932384 | Human Services | VA | $52,053,736Large | 88.48 |
| National Council on US-Arab RelationsEIN 52-1296502 | International | DC | $1,630,801Small | 94.34 |
| National Cowboy and Western Heritage MuseumEIN 30-0341029 | Arts, Culture, Humanities | OK | $9,895,778Mid-sized | 81.24 |
| National Cyber Security AllianceEIN 02-0629238 | Research and Public Policy | DC | $1,978,769Small | 85.09 |
| National D-Day Memorial FoundationEIN 54-1504679 | Arts, Culture, Humanities | VA | $1,804,904Small | 81.55 |
| National Day of Prayer Task ForceEIN 75-1914068 | Religion | CO | $1,140,148Small | 84.18 |
| National Defense University FoundationEIN 52-1268692 | Research and Public Policy | DC | $495,880Small | 71.81 |
| National Disaster Search Dog FoundationEIN 77-0412509 | Animals | CA | $5,478,026Mid-sized | 92.51 |
| National Down Syndrome SocietyEIN 13-2992567 | Health | NY | $2,131,501Small | 87.28 |
| National Eating Disorders AssociationEIN 13-3444882 | Health | NY | $3,619,563Mid-sized | 91.49 |
| National Emergency Medicine AssociationEIN 52-1257429 | Health | MD | $1,812,105Small | 50.19 |
| National Employment Law ProjectEIN 13-2758558 | Research and Public Policy | NY | $8,569,143Mid-sized | 92.22 |
| National Environmental Education FoundationEIN 54-1557043 | Environment | DC | $3,621,403Mid-sized | 90.40 |
| National Fallen Firefighters FoundationEIN 52-1832634 | Human Services | MD | $5,723,356Mid-sized | 90.81 |
| National Family Planning & Reproductive Health AssociationEIN 23-7323629 | Human and Civil Rights | DC | $4,644,303Mid-sized | 90.28 |
| National FFA FoundationEIN 54-6044662 | Human Services | IN | $18,193,311Large | 85.13 |
| National Fire Safety CouncilEIN 38-2292422 | Education | MI | $2,954,232Small | 79.79 |
| National Fish and Wildlife FoundationEIN 52-1384139 | Animals | DC | $302,313,179Large | 90.94 |
| National Football FoundationEIN 22-1508812 | Human Services | TX | $3,117,017Small | 75.25 |
| National Forest FoundationEIN 52-1786332 | Environment | MT | $13,645,766Large | 93.66 |
| National Foundation for Cancer ResearchEIN 04-2531031 | Health | MD | $13,432,400Mid-sized | 82.26 |
| National Foundation for Infectious DiseasesEIN 23-7198530 | Health | MD | $2,560,704Small | 94.81 |
| National Foundation for TransplantsEIN 58-1527254 | Health | TN | $3,529,484Mid-sized | 90.69 |
| 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 Gaucher FoundationEIN 52-1350226 | Health | MD | $3,545,926Mid-sized | 76.07 |