| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sialejevskaja Pjatina | city | Mordoviya | Russia | 53.81 | 44.52 | 830 | 1490 |
| Sialeyevskaya Pyatina | city | Mordoviya | Russia | 53.81 | 44.52 | 830 | 1490 |
| Sialeyevskiy | city | Mordoviya | Russia | 54.08 | 44.20 | 830 | 518 |
| Sialeyevskiy Maydan | city | Mordoviya | Russia | 54.08 | 44.20 | 830 | 518 |
| Silikatnyy | city | Mordoviya | Russia | 54.11 | 43.90 | 830 | 4041 |
| Silino | city | Mordoviya | Russia | 54.98 | 46.03 | 830 | 1398 |
| Simkino | city | Mordoviya | Russia | 54.08 | 42.39 | 830 | 914 |
| Simkino | city | Mordoviya | Russia | 54.25 | 46.17 | 416 | 2065 |
| Simkinskoye Lesnichestvo | city | Mordoviya | Russia | 54.23 | 46.21 | 830 | 1897 |
| Singileyka | city | Mordoviya | Russia | 53.71 | 44.30 | 830 | 1366 |
| Sinyakovo | city | Mordoviya | Russia | 54.43 | 43.68 | 830 | 1935 |
| Sivin' | city | Mordoviya | Russia | 54.36 | 44.25 | 830 | 1359 |
| Sivin’ | city | Mordoviya | Russia | 54.36 | 44.25 | 830 | 1359 |