| National Taxpayers Union FoundationEIN 52-1122683 | Human and Civil Rights | DC | $400,712Small | 87.53 |
| National Tropical Botanical GardenEIN 52-6057064 | Environment | HI | $11,377,135Mid-sized | 92.74 |
| National Trust for Historic PreservationEIN 53-0210807 | Arts, Culture, Humanities | DC | $48,392,459Large | 79.88 |
| National Underground Railroad Freedom CenterEIN 31-1436217 | Arts, Culture, Humanities | OH | $5,965,065Mid-sized | 79.31 |
| National Urban LeagueEIN 13-1840489 | Human and Civil Rights | NY | $47,626,361Large | 88.27 |
| National Veterans FoundationEIN 95-3994750 | Human Services | CA | $1,016,799Small | 92.20 |
| National WASP WWII MuseumEIN 56-2326843 | Arts, Culture, Humanities | TX | $1,185,778Small | 70.69 |
| National Wild Turkey FederationEIN 57-0564993 | Animals | SC | $41,988,609Large | 89.70 |
| National Wildlife FederationEIN 53-0204616 | Animals | VA | $73,731,937Large | 81.19 |
| 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 |
| National Wrestling Coaches AssociationEIN 42-1479687 | Human Services | PA | $1,783,362Small | 75.72 |
| National Yiddish Book CenterEIN 04-2708878 | Arts, Culture, Humanities | MA | $5,587,913Mid-sized | 82.91 |
| National YoungArts FoundationEIN 59-2141837 | Education | FL | $10,922,459Mid-sized | 89.39 |
| National Youth Leadership CouncilEIN 41-1449746 | Education | MN | $1,248,992Small | 86.09 |
| Native American Heritage AssociationEIN 46-0414390 | Human Services | SD | $56,083,600Large | 89.42 |
| Native American Rights FundEIN 84-0611876 | Human Services | CO | $11,065,425Mid-sized | 83.92 |
| Native Seeds/SEARCHEIN 94-2899356 | Environment | AZ | $1,068,375Small | 78.07 |
| Nativity Academy at Saint BonifaceEIN 51-0450314 | Education | KY | $1,419,132Small | 92.40 |
| Nativity Prep AcademyEIN 33-0886247 | Education | CA | $1,520,569Small | 81.05 |
| Nativity School of WorcesterEIN 03-0385377 | Education | MA | $1,580,928Small | 86.73 |
| Natural History Museum of Los Angeles CountyEIN 95-6132185 | Arts, Culture, Humanities | CA | $47,622,662Large | 86.41 |
| Natural Resources Defense CouncilEIN 13-2654926 | Environment | NY | $128,772,908Large | 93.49 |
| Nature and Culture InternationalEIN 33-0773524 | Environment | CA | $6,361,508Mid-sized | 93.91 |
| NatureServeEIN 52-1884438 | Environment | VA | $8,421,554Mid-sized | 84.93 |
| Navajo MinistriesEIN 85-0113191 | Human Services | NM | $1,197,117Small | 77.00 |
| Naval Aviation Museum FoundationEIN 59-6178237 | Arts, Culture, Humanities | FL | $9,371,160Mid-sized | 96.46 |
| Naval War College FoundationEIN 23-7063084 | Education | RI | $2,670,184Small | 90.42 |
| Navy SEAL FoundationEIN 31-1728910 | Human Services | VA | $15,895,708Large | 100.00 |
| Navy-Marine Corps Relief SocietyEIN 53-0204618 | Human Services | VA | $27,989,419Large | 89.39 |
| Nazarene Compassionate Ministries, Inc.EIN 43-1550318 | International | KS | $3,518,777Mid-sized | 90.71 |
| NC WARNEIN 56-1734433 | Environment | NC | $1,625,630Small | 75.89 |
| NCSL Foundation for State LegislaturesEIN 74-2232576 | Research and Public Policy | CO | $3,158,402Small | 80.44 |
| NCTAEIN 51-0236530 | Education | TX | $8,041,040Mid-sized | 83.25 |
| NDI New MexicoEIN 85-0431846 | Education | NM | $6,160,996Mid-sized | 91.71 |
| NEADS Inc.EIN 23-7281887 | Animals | MA | $2,572,503Small | 94.27 |
| Near East FoundationEIN 13-1624114 | International | NY | $14,619,159Large | 91.16 |
| Near West TheatreEIN 34-1881815 | Arts, Culture, Humanities | OH | $1,201,075Small | 89.24 |
| Neat StuffEIN 65-0746714 | Human Services | FL | $949,838Small | 83.73 |
| Nebraska AIDS ProjectEIN 47-0786622 | Health | NE | $1,655,303Small | 89.81 |
| Nebraska Children and Families FoundationEIN 91-1829974 | Human Services | NE | $15,375,397Large | 91.65 |
| Nebraska Humane SocietyEIN 47-0378997 | Animals | NE | $12,005,552Mid-sized | 92.07 |
| Nebraska Humanities CouncilEIN 23-7359778 | Arts, Culture, Humanities | NE | $1,688,771Small | 90.32 |
| Nebraska Lutheran Outdoor MinistriesEIN 47-0488319 | Religion | NE | $3,093,769Small | 91.52 |
| NEEDEIN 25-6070821 | Education | PA | $1,588,935Small | 66.95 |
| Need Him GlobalEIN 75-2716321 | Religion | TX | $1,036,874Small | 84.24 |
| Negative Population GrowthEIN 46-4868482 | Research and Public Policy | VA | $816,014Small | 78.66 |
| Nehemiah CenterEIN 76-0437157 | Religion | TX | $1,717,352Small | 88.72 |
| Neighbor For NeighborEIN 73-0776404 | Human Services | OK | $2,754,735Small | 72.21 |
| Neighbor to NeighborEIN 06-6071605 | Human Services | CT | $1,911,914Small | 94.44 |
| Neighborhood Christian CentersEIN 58-1394456 | Human Services | TN | $3,096,898Small | 83.32 |
| Neighborhood ClubEIN 38-1387143 | Human Services | MI | $3,098,949Small | 90.58 |
| Neighborhood Development CenterEIN 41-1738791 | Community Development | MN | $3,154,382Small | 82.92 |
| Neighborhood Health ClinicEIN 59-3546884 | Health | FL | $3,284,533Small | 96.79 |
| Neighborhood House of MilwaukeeEIN 39-0806269 | Human Services | WI | $2,232,121Small | 84.94 |
| Neighborhood House, LouisvilleEIN 61-0445842 | Human Services | KY | $1,886,954Small | 92.17 |
| Neighborhood House, St. PaulEIN 41-0693916 | Human Services | MN | $6,187,531Mid-sized | 91.02 |
| Neighborhood Housing Services of ChicagoEIN 23-7443009 | Community Development | IL | $4,208,251Mid-sized | 67.53 |
| Neighborhood Legal Services AssociationEIN 25-1157129 | Human and Civil Rights | PA | $4,136,700Mid-sized | 86.50 |
| Neighborhood MinistriesEIN 86-0809052 | Human Services | AZ | $2,588,356Small | 87.80 |