| Simpson, LA (Village) |
| Simpson, IL (Village) |
| Simpson, NC (Village) |
| Simpson County, KY (County) |
| Simpson County, MS (County) |
| Simpsonville, SC (City) |
| Simpsonville, KY (City) |
| Sims, IN (Township) |
| Sims, NC (Town) |
| Sims, IL (Village) |
| Sims Township, MI (Township) |
| Simsboro, LA (Village) |
| Simsbury, CT (Town) |
| Sinai, SD (Town) |
| Sinclair, KS (Township) |
