| Sully County, SD (County) |
| Sulphur, OK (City) |
| Sulphur, LA (City) |
| Sulphur Rock, AR (Town) |
| Sulphur Springs, AR (City) |
| Sulphur Springs, IN (Town) |
| Sulphur Springs, TX (City) |
| Sultan, WA (City) |
| Sumas, WA (City) |
| Sumiton, AL (City) |
| Summer Woods Community Development District, FL (CDD) |
| Summerdale, AL (Town) |
| Summerfield, NC (Town) |
| Summerfield, IL (Village) |
| Summerfield, OH (Village) |
