| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Sea Mount | city | Baile Atha Cliath | Ireland | 53.4427778 | -6.14 | 3 | 68332 |
| Sea View | city | Corcaigh | Ireland | 51.6508333 | -8.645 | 85 | 3063 |
| Seacor | city | County Donegal | Ireland | 54.9380556 | -7.9016667 | 259 | 2310 |
| Seafield | city | Baile Atha Cliath | Ireland | 53.4747222 | -6.1763889 | 3 | 93900 |
| Seafort | city | Corcaigh | Ireland | 51.5113889 | -9.585 | 0 | 3289 |
| Sealaclare Bridge | city | Corcaigh | Ireland | 51.5577778 | -9.4125 | 147 | 4625 |
| Seanghualainn | city | County Limerick | Ireland | 52.5725 | -9.1025 | 203 | 5437 |
| Searcog | city | An Cabhan | Ireland | 54 | -6.9 | 501 | 2774 |
| Searcóg | city | An Cabhan | Ireland | 54 | -6.9 | 501 | 2774 |
| Seartaglin | city | | Ireland | 52.1833333 | -9.4 | 488 | 2422 |
| Sedboro | city | Tiobraid Arann | Ireland | 52.9136111 | -8.3061111 | 167 | 2155 |
| Seedagh | city | County Donegal | Ireland | 55.1861111 | -7.7327778 | 0 | 1733 |
| Seerin | city | County Offaly | Ireland | 53.0855556 | -7.9052778 | 232 | 2686 |
| Seershin | city | Gaillimh | Ireland | 53.2666667 | -9.2166667 | 88 | 2126 |
| Selloo | city | County Monaghan | Ireland | 54.2533333 | -7.1252778 | 249 | 3275 |
| Seltannaveeny | city | | Ireland | 54.1 | -8.1166667 | 492 | 1622 |
| Seltannavenny | city | | Ireland | 54.1 | -8.1166667 | 492 | 1622 |
| Serothea | city | Port Lairge | Ireland | 52.3455556 | -7.7094444 | 882 | 3629 |
| Seskin | city | Cill Mhantain | Ireland | 52.9825 | -6.5669444 | 849 | 4575 |
| Seskinrea | city | County Carlow | Ireland | 52.7677778 | -7.0683333 | 600 | 3702 |
| Seskinryan | city | County Carlow | Ireland | 52.6822222 | -6.9316667 | 377 | 4201 |
| Sessiagh | city | County Donegal | Ireland | 55.24 | -7.7377778 | 82 | 1261 |
| Sessuecommon | city | Sligeach | Ireland | 54.0841667 | -8.815 | 200 | 2674 |
| Seven Cross Roads | city | Cill Chainnigh | Ireland | 52.7963889 | -7.2880556 | 636 | 3244 |
| Seven Houses Cross Roads | city | Cill Chainnigh | Ireland | 52.5830556 | -7.2702778 | 229 | 3312 |
| Sevensisters | city | Cill Chainnigh | Ireland | 52.7347222 | -7.5305556 | 469 | 3260 |
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