| 1 | Nacogdoches County | Texas | 65,728 | 1.6 % | 4.5 % |
| 2 | Nance County | Nebraska | 3,262 | -3.5 % | 2.4 % |
| 3 | Nantucket County | Massachusetts | 14,670 | 2.9 % | 7.2 % |
| 4 | Napa County | California | 132,727 | -3.8 % | 4.3 % |
| 5 | Nash County | North Carolina | 97,990 | 3.2 % | 4.8 % |
| 6 | Nassau County | New York | 1,392,438 | -0.2 % | 3.3 % |
| 7 | Nassau County | Florida | 104,376 | 15.5 % | 3.9 % |
| 8 | Natchitoches Parish | Louisiana | 35,982 | -4.1 % | 5.8 % |
| 9 | Natrona County | Wyoming | 80,410 | 0.6 % | 3.4 % |
| 10 | Naugatuck Valley Planning Region | Connecticut | 462,220 | 2.7 % | 4.5 % |
| 11 | Navajo County | Arizona | 109,516 | 2.6 % | 6.4 % |
| 12 | Navarro County | Texas | 56,533 | 7.4 % | 4.6 % |
| 13 | Nelson County | Kentucky | 48,706 | 4.2 % | 4.4 % |
| 14 | Nelson County | Virginia | 14,766 | -0.0 % | 3.2 % |
| 15 | Nelson County | North Dakota | 3,007 | -0.4 % | 2.6 % |
| 16 | Nemaha County | Kansas | 10,062 | -2.1 % | 2.7 % |
| 17 | Nemaha County | Nebraska | 7,046 | -0.4 % | 3.4 % |
| 18 | Neosho County | Kansas | 15,552 | -2.2 % | 3.8 % |
| 19 | Neshoba County | Mississippi | 28,973 | -0.4 % | 3.6 % |
| 20 | Ness County | Kansas | 2,617 | -2.6 % | 2.9 % |
| 21 | Nevada County | California | 102,195 | -0.0 % | 4.8 % |
| 22 | Nevada County | Arkansas | 8,004 | -3.7 % | 5.5 % |
| 23 | New Castle County | Delaware | 588,093 | 3.0 % | 4.7 % |
| 24 | New Hanover County | North Carolina | 243,333 | 7.8 % | 3.5 % |
| 25 | New Kent County | Virginia | 27,218 | 18.6 % | 2.9 % |
| 26 | New Madrid County | Missouri | 15,212 | -7.4 % | 5.1 % |
| 27 | New York County | New York | 1,660,664 | -2.0 % | 4.7 % |
| 28 | Newaygo County | Michigan | 51,504 | 3.1 % | 5.7 % |
| 29 | Newberry County | South Carolina | 39,203 | 3.9 % | 4.4 % |
| 30 | Newport County | Rhode Island | 83,468 | -2.5 % | 4.0 % |
| 31 | Newport News city | Virginia | 183,056 | -1.7 % | 4.0 % |
| 32 | Newton County | Georgia | 124,010 | 10.2 % | 4.1 % |
| 33 | Newton County | Missouri | 61,519 | 4.9 % | 3.9 % |
| 34 | Newton County | Mississippi | 21,063 | -1.1 % | 3.7 % |
| 35 | Newton County | Indiana | 14,131 | 2.2 % | 4.1 % |
| 36 | Newton County | Texas | 11,908 | -2.5 % | 6.2 % |
| 37 | Newton County | Arkansas | 7,026 | -2.8 % | 4.9 % |
| 38 | Nez Perce County | Idaho | 42,847 | 1.8 % | 3.7 % |
| 39 | Niagara County | New York | 209,570 | -1.5 % | 4.4 % |
| 40 | Nicholas County | West Virginia | 24,017 | -2.4 % | 5.3 % |
| 41 | Nicholas County | Kentucky | 7,816 | 3.8 % | 4.3 % |
| 42 | Nicollet County | Minnesota | 34,493 | 0.1 % | 3.2 % |
| 43 | Niobrara County | Wyoming | 2,301 | -6.8 % | 4.1 % |
| 44 | Noble County | Indiana | 47,811 | 0.7 % | 3.4 % |
| 45 | Noble County | Ohio | 14,269 | 1.1 % | 7.0 % |
| 46 | Noble County | Oklahoma | 10,896 | -0.3 % | 2.8 % |
| 47 | Nobles County | Minnesota | 21,969 | -1.4 % | 3.5 % |
| 48 | Nodaway County | Missouri | 20,503 | -3.4 % | 3.1 % |
| 49 | Nolan County | Texas | 14,182 | -3.8 % | 3.7 % |
| 50 | Nome Census Area | Alaska | 9,836 | -2.0 % | 9.6 % |
| 51 | Norfolk city | Virginia | 231,105 | -2.9 % | 4.0 % |
| 52 | Norfolk County | Massachusetts | 740,754 | 2.0 % | 4.1 % |
| 53 | Norman County | Minnesota | 6,284 | -2.5 % | 3.9 % |
| 54 | North Slope Borough | Alaska | 10,663 | -3.4 % | 3.2 % |
| 55 | Northampton County | Pennsylvania | 322,989 | 3.2 % | 4.3 % |
| 56 | Northampton County | North Carolina | 16,580 | -5.1 % | 5.0 % |
| 57 | Northampton County | Virginia | 12,004 | -2.2 % | 4.2 % |
| 58 | Northeastern Connecticut Planning Region | Connecticut | 97,701 | 2.5 % | 4.1 % |
| 59 | Northumberland County | Pennsylvania | 90,027 | -1.8 % | 4.8 % |
| 60 | Northumberland County | Virginia | 12,397 | 4.7 % | 5.9 % |
| 61 | Northwest Arctic Borough | Alaska | 7,134 | -8.5 % | 10.0 % |
| 62 | Northwest Hills Planning Region | Connecticut | 114,101 | 1.5 % | 3.7 % |
| 63 | Norton city | Virginia | 3,478 | -5.9 % | 4.0 % |
| 64 | Norton County | Kansas | 5,335 | -2.2 % | 3.0 % |
| 65 | Nottoway County | Virginia | 15,632 | -0.1 % | 4.0 % |
| 66 | Nowata County | Oklahoma | 9,561 | 2.5 % | 3.4 % |
| 67 | Noxubee County | Mississippi | 9,825 | -4.4 % | 4.8 % |
| 68 | Nuckolls County | Nebraska | 4,094 | -0.0 % | 2.4 % |
| 69 | Nueces County | Texas | 353,125 | -0.1 % | 4.2 % |
| 70 | Nye County | Nevada | 55,990 | 8.5 % | 6.6 % |