| City | Region | Country | Time Zone | Population | |
|---|---|---|---|---|---|
| Mandan | North Dakota | United States | Central Daylight Time | 21,382 | |
| Winchester | Massachusetts | United States | Eastern Daylight Time | 21,374 | |
| Okemos | Michigan | United States | Eastern Daylight Time | 21,369 | |
| Arnold | Missouri | United States | Central Daylight Time | 21,357 | |
| East Moline | Illinois | United States | Central Daylight Time | 21,350 | |
| West Pensacola | Florida | United States | Central Daylight Time | 21,339 | |
| Kinston | North Carolina | United States | Eastern Daylight Time | 21,337 | |
| Shelbyville | Tennessee | United States | Central Daylight Time | 21,317 | |
| Marquette | Michigan | United States | Eastern Daylight Time | 21,297 | |
| Fairfield Heights | Indiana | United States | Eastern Daylight Time | 21,285 | |
| Biddeford | Maine | United States | Eastern Daylight Time | 21,282 | |
| Golden Valley | Minnesota | United States | Central Daylight Time | 21,270 | |
| Canyon Lake | Texas | United States | Central Daylight Time | 21,262 | |
| Conda | Idaho | United States | Mountain Daylight Time | 21,260 | |
| Oxford | Alabama | United States | Central Daylight Time | 21,249 | |
| South Milwaukee | Wisconsin | United States | Central Daylight Time | 21,233 | |
| Marina | California | United States | Pacific Daylight Time | 21,229 | |
| Mukilteo | Washington | United States | Pacific Daylight Time | 21,226 | |
| Rancho San Diego | California | United States | Pacific Daylight Time | 21,208 | |
| Charleston | Illinois | United States | Central Daylight Time | 21,196 |
