| Somerville, IN (Town) |
| Somerville, ME (Town) |
| Somo Town, WI (Town) |
| Somonauk, IL (Village) |
| Somonauk Township, IL (Township) |
| Songer Township, IL (Township) |
| Sonoma, CA (City) |
| Sonoma Bay Community Development District, FL (CDD) |
| Sonoma County, CA (County) |
| Sonora, KY (City) |
| Sonora, TX (City) |
| Sonora, CA (City) |
| Sonora Township, IL (Township) |
| Soo, ND (Township) |
| Soo Township, MI (Township) |
