| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| An Scailp | city | Wicklow | Ireland | 53.08 | -6.58 | 997 | 1882 |
| An Scairbh | city | Clare | Ireland | 52.90 | -8.51 | 272 | 1669 |
| An Scairt | city | Kilkenny | Ireland | 52.59 | -7.07 | 830 | 2174 |
| An Sceachánach | city | Kilkenny | Ireland | 52.84 | -7.26 | 830 | 2555 |
| An Sceachánach | city | Galway | Ireland | 53.12 | -8.77 | 147 | 1482 |
| An Sciobairin | city | Cork | Ireland | 51.55 | -9.27 | 347 | 4194 |
| An Scoil | city | Cork | Ireland | 51.53 | -9.53 | 144 | 1689 |
| An Screagán | city | Offaly | Ireland | 53.25 | -7.58 | 249 | 2442 |
| An Screathan | city | Ireland | 52.01 | -7.68 | 830 | 816 | |
| An Scumhal | city | Clare | Ireland | 52.92 | -9.09 | 265 | 1536 |
| An Seanach | city | Donegal | Ireland | 54.59 | -8.05 | 341 | 1416 |
| An Seanbaile | city | Galway | Ireland | 53.41 | -9.03 | 111 | 2701 |
| An Seanbhaile | city | Ireland | 52.13 | -7.54 | 272 | 2047 | |
| An Seanbhaile | city | Donegal | Ireland | 55.16 | -7.98 | 1194 | 1296 |
| An Seanbhaile | city | Galway | Ireland | 53.38 | -9.50 | 318 | 439 |
| An Seanbhaile | city | Galway | Ireland | 53.23 | -8.77 | 121 | 2116 |
| An Seanbhaile | city | Galway | Ireland | 53.41 | -9.03 | 111 | 2701 |
| An Seanbhaile | city | Galway | Ireland | 53.12 | -8.40 | 219 | 1384 |
| An Seanbhaile Mor | city | Cork | Ireland | 52.22 | -8.50 | 226 | 1423 |
| An Seanbhábhún | city | South Dublin | Ireland | 53.28 | -6.37 | 387 | 117258 |
| An Seanchaisleán | city | Meath | Ireland | 53.77 | -7.16 | 370 | 2501 |
| An Seanchuach | city | Monaghan | Ireland | 54.36 | -6.97 | 95 | 2856 |
| An Seanlios | city | Lu | Ireland | 53.84 | -6.57 | 160 | 6228 |
| An Seas | city | Leitrim | Ireland | 54.20 | -8.05 | 219 | 525 |
| An Seisíoch | city | Donegal | Ireland | 55.24 | -7.74 | 82 | 765 |
| An Sian | city | Mayo | Ireland | 53.81 | -9.46 | 249 | 4277 |
| An Sliabh Carrach | city | Kilkenny | Ireland | 52.40 | -7.01 | 249 | 2312 |
| An Slád | city | South Dublin | Ireland | 53.27 | -6.45 | 846 | 34926 |
| An Snaidhm | city | Kerry | Ireland | 51.83 | -9.90 | 82 | 445 |
| An Sonnach | city | Mayo | Ireland | 53.96 | -8.83 | 213 | 1822 |
| An Spidéal | city | Galway | Ireland | 53.25 | -9.30 | 3 | 1011 |
| An Sraith Mor | city | Mayo | Ireland | 53.96 | -9.57 | 295 | 380 |
| An Srath Bui | city | Donegal | Ireland | 54.75 | -8.62 | 830 | 395 |
| An Srath Mor | city | Mayo | Ireland | 53.96 | -9.57 | 295 | 380 |
| An Srath Mor | city | Mayo | Ireland | 54.15 | -9.79 | 216 | 537 |
| An Sruthán | city | Wicklow | Ireland | 53.14 | -6.51 | 830 | 3034 |
| An Sráidbhaile | city | Laois | Ireland | 53.02 | -7.15 | 830 | 2519 |
| An Sráidbhaile | city | Kerry | Ireland | 52.25 | -10.07 | 265 | 985 |
| An Stúinín | city | Kilkenny | Ireland | 52.56 | -7.10 | 285 | 2543 |
| An Séipéal | city | Wexford | Ireland | 52.44 | -6.70 | 242 | 2296 |