| Site | State | Type | Population |
|---|---|---|---|
| North Union Township, PA | Pennsylvania | City | 12143 |
| North Wildwood, NJ | New Jersey | City | 3794 |
| North Wilkesboro, NC | North Carolina | City | 4194 |
| Northampton County, PA | Pennsylvania | County | 313628 |
| Northampton, MA | Massachusetts | City | 29311 |
| Northborough, MA | Massachusetts | City | 15101 |
| Northfield, OH | Ohio | City | 3522 |
| Northport, AL | Alabama | City | 25970 |
| Northwood, OH | Ohio | City | 5179 |
| Norton, MA | Massachusetts | City | 19948 |
| Norwalk, CT | Connecticut | City | 91194 |
| Norwalk, OH | Ohio | City | 17015 |
| Norwich, CT | Connecticut | City | 40014 |
| Novato, CA | California | City | 53781 |
| Nueces County, TX | Texas | County | 362294 |
| O’Neill, NE | Nebraska | City | 3547 |
| Oak Creek, WI | Wisconsin | City | 36260 |
| Oak Forest, IL | Illinois | City | 27403 |
| Oak Grove, KY | Kentucky | City | 7332 |
| Oak Hill, OH | Ohio | City | 1404 |
| Oak Park Heights, MN | Minnesota | City | 4750 |
| Oak Ridge, TN | Tennessee | City | 31824 |
| Oak Ridge, TX | Texas | City | 524 |
| Oakdale, MN | Minnesota | City | 27925 |
| Oakland County, MI | Michigan | County | 1258000 |
| Oakland, CA | California | City | 433823 |
| Oberlin, OH | Ohio | City | 8249 |
| Ocala, FL | Florida | City | 60021 |
| Occoquan, VA | Virginia | City | 1038 |
| Ocean City, MD | Maryland | City | 6957 |
| Ocean City, NJ | New Jersey | City | 11065 |
| Ocean County, NJ | New Jersey | County | 602018 |
| Ocean Township, NJ | New Jersey | City | 26959 |
| Ocean View, DE | Delaware | City | 2752 |
| Oceanside, CA | California | City | 175694 |
| Oconee County, SC | South Carolina | County | 79203 |
| Oconto County, WI | Wisconsin | County | 39356 |
| Odenton, MD | Maryland | City | 42258 |
| Odessa, TX | Texas | City | 112584 |
| Ogden, UT | Utah | City | 87321 |
| Okaloosa County, FL | Florida | County | 211668 |
| Oklahoma City, OK | Oklahoma | City | 649821 |
| Old Orchard Beach, ME | Maine | City | 8960 |
| Oliver Springs, TN | Tennessee | City | 3302 |
| Olmsted County, MN | Minnesota | County | 163436 |
| Olympia, WA | Washington | City | 55919 |
| Omaha, NE | Nebraska | City | 487300 |
| Oneida County, NY | New York | County | 231300 |
| Oneida County, WI | Wisconsin | County | 38259 |
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