| Sylvania Township, PA (Township) |
| Sylvarena, MS (Village) |
| Sylvester, GA (City) |
| Sylvester, WV (Town) |
| Sylvester Town, WI (Town) |
| Sylvia, KS (City) |
| Sylvia, KS (Township) |
| Symerton, IL (Village) |
| Symmes Township, IL (Township) |
| Symmes Township, OH (Township) |
| Symmes Township, OH (Township) |
| Synnes, MN (Township) |
| Syracuse, NY (City) |
| Syracuse, OH (Village) |
| Syracuse, MO (City) |
