| Newport News City | 180,000 | Newport News | Virginia | Norfolk, VA-Salisbury, MD | View → |
| Newton | 115,000 | Covington | Georgia | Atlanta, GA | View → |
| Newton | 14,000 | Kentland | Indiana | Chicago, IL | View → |
| Newton | 13,000 | Newton | Texas | Houston, TX | View → |
| Newton | 7,800 | Jasper | Arkansas | Springfield, MO | View → |
| Newton | 59,000 | Neosho | Missouri | Springfield, MO | View → |
| Newton | 22,000 | Newton | Mississippi | Tupelo-Meridian-Greenwood, MS | View → |
| Nez Perce | 42,500 | Lewiston | Idaho | Spokane, WA | View → |
| Niagara | 207,600 | Niagara Falls | New York | Buffalo-Rochester-Syracuse, NY | View → |
| Nicholas | 24,000 | Summersville | West Virginia | Charleston-Bluefield, WV | View → |
| Nicholas | 7,200 | Carlisle | Kentucky | Lexington-Bowling Green, KY | View → |
| Nicollet | 35,000 | St. Peter | Minnesota | Minneapolis-St. Paul, MN | View → |
| Niobrara | 2,300 | Lusk | Wyoming | Denver-Colorado Springs, CO | View → |
| Noble | 48,000 | Albion | Indiana | Indianapolis-Fort Wayne, IN | View → |
| Noble | 11,000 | Perry | Oklahoma | Oklahoma City, OK | View → |
| Noble | 11,000 | Caldwell | Ohio | Wheeling-Clarksburg-Parkersburg, WV | View → |
| Nobles | 22,000 | Worthington | Minnesota | Sioux Falls-Rapid City, SD | View → |
| Nodaway | 22,000 | Maryville | Missouri | Kansas City, MO | View → |
| Nolan | 15,000 | Sweetwater | Texas | Lubbock-Abilene, TX | View → |
| Norfolk | 720,000 | Quincy | Massachusetts | Boston-Springfield, MA | View → |
| Norfolk City | 240,000 | Norfolk | Virginia | Norfolk, VA-Salisbury, MD | View → |
| Norman | 6,600 | Ada | Minnesota | Fargo, ND | View → |
| Northampton | 12,000 | Cape Charles | Virginia | Norfolk, VA-Salisbury, MD | View → |
| Northampton | 312,000 | Bethlehem | Pennsylvania | Philadelphia, PA | View → |
| Northampton | 19,000 | Jackson | North Carolina | Raleigh-Greenville-Wilmington, NC | View → |
| Northumberland | 12,000 | Heathsville | Virginia | Richmond, VA | View → |
| Northumberland | 90,000 | Sunbury | Pennsylvania | Scranton, PA-Binghamton, NY | View → |
| Norton | 5,100 | Norton | Kansas | Wichita, KS | View → |
| Norton City | 3,700 | Norton | Virginia | Tri-Cities, TN/VA | View → |
| Nottoway | 15,500 | Crewe | Virginia | Richmond, VA | View → |
| Nowata | 10,000 | Nowata | Oklahoma | Tulsa, OK-Fort Smith, AR | View → |
| Noxubee | 11,000 | Macon | Mississippi | Tupelo-Meridian-Greenwood, MS | View → |
| Nuckolls | 4,300 | Nelson | Nebraska | Lincoln, NE | View → |
| Nueces | 362,000 | Corpus Christi | Texas | San Antonio-Corpus Christi, TX | View → |
| Nye | 56,000 | Pahrump | Nevada | Las Vegas-Reno, NV | View → |
| O'Brien | 14,000 | Sheldon | Iowa | Omaha, NE-Sioux City, IA | View → |
| Oakland | 1,250,000 | Pontiac | Michigan | Detroit, MI-Toledo, OH | View → |
| Obion | 30,000 | Union City | Tennessee | Paducah, KY | View → |
| Ocean | 637,379 | Toms River | New Jersey | New York, NY | View → |
| Oceana | 27,000 | Hart | Michigan | Grand Rapids, MI | View → |
| Ochiltree | 10,700 | Perryton | Texas | Amarillo, TX | View → |
| Oconee | 44,000 | Watkinsville | Georgia | Atlanta, GA | View → |
| Oconee | 81,000 | Seneca | South Carolina | Greenville, SC-Asheville, NC | View → |
| Oconto | 38,500 | Oconto | Wisconsin | Green Bay, WI-Duluth, MN | View → |
| Ogemaw | 20,500 | West Branch | Michigan | Traverse City, MI | View → |
| Oglala Lakota | 14,500 | Pine Ridge | South Dakota | Sioux Falls-Rapid City, SD | View → |
| Ogle | 52,000 | Oregon | Illinois | Chicago, IL | View → |
| Oglethorpe | 15,000 | Lexington | Georgia | Atlanta, GA | View → |
| Ohio | 6,100 | Rising Sun | Indiana | Cincinnati-Dayton, OH | View → |
| Ohio | 24,000 | Beaver Dam | Kentucky | Louisville, KY-Evansville, IN | View → |
