| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Uachtar Ard | city | Gaillimh | Ireland | 53.4166667 | -9.3333333 | 203 | 1695 |
| Uggoon | city | An Clar | Ireland | 52.9161111 | -8.7383333 | 449 | 2507 |
| Ulla | city | County Limerick | Ireland | 52.5297222 | -8.2583333 | 311 | 4184 |
| Ullard | city | Cill Chainnigh | Ireland | 52.5797222 | -6.9308333 | 88 | 3812 |
| Ullard Bridge | city | County Carlow | Ireland | 52.7111111 | -6.8261111 | 347 | 4226 |
| Umgall | city | County Donegal | Ireland | 55.3327778 | -7.2994444 | 249 | 1799 |
| Ummera | city | County Leitrim | Ireland | 54.1936111 | -8.0763889 | 498 | 1556 |
| Ummeryroe | city | | Ireland | 54.1166667 | -8.2833333 | 416 | 2541 |
| Ummoon | city | Maigh Eo | Ireland | 53.9444444 | -9.1019444 | 78 | 1807 |
| Umrycam | city | County Donegal | Ireland | 55.1833333 | -7.7 | 0 | 1827 |
| Umrycam | city | County Donegal | Ireland | 55.1602778 | -7.4325 | 393 | 2013 |
| Unionhall | city | Corcaigh | Ireland | 51.55 | -9.1333333 | 91 | 4009 |
| Unshinagh | city | County Leitrim | Ireland | 54.4383333 | -8.3138889 | 180 | 1300 |
| Upper Ballycotteen | city | An Clar | Ireland | 52.9791667 | -9.4130556 | 498 | 1574 |
| Upper Convamore | city | Corcaigh | Ireland | 52.1586111 | -8.4111111 | 173 | 5184 |
| Upper Glanmire Bridge | city | Corcaigh | Ireland | 51.9552778 | -8.4175 | 314 | 5209 |
| Upper Grange Cross Roads | city | Cill Chainnigh | Ireland | 52.6141667 | -7.03 | 137 | 3389 |
| Upper Town | city | County Donegal | Ireland | 55.1597222 | -7.6625 | 387 | 1934 |
| Upperchurch | city | Tiobraid Arann | Ireland | 52.7033333 | -8.0175 | 954 | 2850 |
| Upton | city | Corcaigh | Ireland | 51.7922222 | -8.6733333 | 246 | 5223 |
| Uragh | city | An Cabhan | Ireland | 54.1930556 | -7.6972222 | 249 | 2565 |
| Urbalreagh | city | County Donegal | Ireland | 55.3363889 | -7.2852778 | 249 | 1253 |
| Urlingford | city | Cill Chainnigh | Ireland | 52.7205556 | -7.5825 | 472 | 3184 |
| Urraghil | city | Corcaigh | Ireland | 52.1611111 | -9.1155556 | 616 | 5184 |
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