| Seboeis, ME (Plantation) |
| Sebree, KY (City) |
| Sebring , FL (City) |
| Sebring, OH (Village) |
| Secaucus, NJ (Town) |
| Secor, IL (Village) |
| Secord Township, MI (Township) |
| Secretary, MD (Town) |
| Section, AL (Town) |
| Sedalia, NC (Town) |
| Sedalia, MO (City) |
| Sedan, KS (City) |
| Sedan, KS (Township) |
| Sedan, MN (City) |
| Sedgewickville, MO (Village) |
