| Sumter County, AL (County) |
| Sumter County, SC (County) |
| Sumter County, FL (County) |
| Sumter Landing Community Development District, FL (CDD) |
| Sun, LA (Village) |
| Sun City, KS (City) |
| Sun City, KS (Township) |
| Sun Prairie, WI (Town) |
| Sun Prairie, WI (City) |
| Sun Prairie, SD (Township) |
| Sun River Terrace, IL (Village) |
| Sun Valley, ID (City) |
| Sun Valley, TX (City) |
| Sunapee, NH (Town) |
| Sunbright, TN (City) |
