| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sailtean na hUinseann | city | Leitrim | Ireland | 54.12 | -7.88 | 984 | 405 |
| Seltanahunshin | city | Leitrim | Ireland | 54.12 | -7.88 | 984 | 405 |
| Shancurry | city | Leitrim | Ireland | 54.04 | -8.08 | 223 | 1806 |
| Shanvaus | city | Leitrim | Ireland | 54.31 | -8.23 | 295 | 1198 |
| Shass | city | Leitrim | Ireland | 54.20 | -8.05 | 219 | 525 |
| Slievenakilla | city | Leitrim | Ireland | 54.15 | -7.93 | 1033 | 314 |
| Sradinagh | city | Leitrim | Ireland | 54.11 | -8.02 | 830 | 487 |
| Sradrine | city | Leitrim | Ireland | 54.30 | -8.02 | 830 | 609 |
| Sranadarragh | city | Leitrim | Ireland | 54.00 | -7.77 | 249 | 1324 |
| Srath Bhraine | city | Leitrim | Ireland | 54.28 | -8.02 | 830 | 543 |
| Srath na Darach | city | Leitrim | Ireland | 54.00 | -7.77 | 249 | 1324 |
| Sravrannies | city | Leitrim | Ireland | 54.28 | -8.02 | 830 | 543 |
| Stuck Cross Roads | city | Leitrim | Ireland | 53.95 | -7.92 | 393 | 1490 |
| Sunnaghconnor Mill | city | Leitrim | Ireland | 53.97 | -7.75 | 269 | 1197 |