| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| An Tamhnaigh | city | Donegal | Ireland | 55.20 | -7.68 | 167 | 1323 |
| An Tamhnaigh | city | Donegal | Ireland | 54.62 | -8.60 | 62 | 1106 |
| An Tamhnaigh | city | Mayo | Ireland | 54.01 | -9.29 | 167 | 945 |
| An Tarae | city | Galway | Ireland | 53.16 | -8.93 | 6 | 1611 |
| An Teach Cloiche | city | Offaly | Ireland | 53.40 | -7.16 | 400 | 1555 |
| An Teach Dóite | city | Galway | Ireland | 53.45 | -9.53 | 830 | 317 |
| An Teach Mór | city | Galway | Ireland | 53.24 | -9.42 | 3 | 772 |
| An Teampall Loiscthe | city | Kilkenny | Ireland | 52.58 | -7.29 | 249 | 2748 |
| An Teampall Mór | city | Ireland | 52.79 | -7.83 | 383 | 3415 | |
| An Tearmann | city | Donegal | Ireland | 55.05 | -7.82 | 830 | 1401 |
| An Tearmann | city | Mayo | Ireland | 54.11 | -10.11 | 3 | 558 |
| An Tir | city | Kerry | Ireland | 52.26 | -10.18 | 265 | 268 |
| An Tobar | city | Offaly | Ireland | 53.38 | -7.66 | 239 | 3006 |
| An Tochar | city | Cork | Ireland | 51.78 | -9.16 | 830 | 1332 |
| An Tochar | city | Kerry | Ireland | 52.41 | -9.73 | 383 | 2480 |
| An Toin Dubh | city | Donegal | Ireland | 55.20 | -7.52 | 252 | 840 |
| An Toin Mhor | city | Mayo | Ireland | 54.25 | -10.01 | 75 | 1813 |
| An Tom Garbh | city | Wexford | Ireland | 52.39 | -6.74 | 226 | 2047 |
| An Trinse Mór | city | Kilkenny | Ireland | 52.51 | -7.41 | 364 | 2725 |
| An Tuairin | city | Kerry | Ireland | 52.32 | -9.61 | 830 | 2362 |
| An Tuairin | city | Kerry | Ireland | 52.38 | -9.42 | 830 | 1308 |
| An Tuairín Garbh | city | Galway | Ireland | 53.30 | -9.59 | 3 | 2439 |
| An Tuar Glas | city | Mayo | Ireland | 54.20 | -9.95 | 0 | 1244 |
| An Tuartán | city | Kilkenny | Ireland | 52.86 | -7.15 | 830 | 2365 |
| An Tulach | city | Carlow | Ireland | 52.80 | -6.74 | 285 | 4165 |
| An Tulach | city | Clare | Ireland | 52.86 | -8.76 | 830 | 1391 |
| An Tulachán | city | Leitrim | Ireland | 54.47 | -8.33 | 3 | 1839 |
| An Tulaigh | city | Galway | Ireland | 53.23 | -9.48 | 0 | 871 |
| An Tulaigh | city | Kerry | Ireland | 52.11 | -9.85 | 26 | 2260 |
| An Tulaigh | city | Kerry | Ireland | 52.37 | -9.60 | 249 | 1839 |
| An Tulaigh | city | Galway | Ireland | 53.19 | -8.16 | 232 | 1317 |
| An Tulaigh Thirim | city | Kilkenny | Ireland | 52.58 | -7.12 | 229 | 2663 |
| An Turlach | city | Galway | Ireland | 53.38 | -9.63 | 0 | 448 |
| An Turlach Beag | city | Galway | Ireland | 53.35 | -9.62 | 3 | 825 |
| An Turlach Mór | city | Clare | Ireland | 53.05 | -8.99 | 249 | 346 |
| An Tóchar | city | Wicklow | Ireland | 53.06 | -6.23 | 830 | 1512 |
| An Tóin Dubh | city | Donegal | Ireland | 54.83 | -7.95 | 830 | 560 |
| An Tóin Rua | city | Galway | Ireland | 53.24 | -8.89 | 9 | 4769 |