| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Taghsheenod | city | Ireland | 53.62 | -7.72 | 282 | 1394 | |
| Taghshinny | city | Ireland | 53.60 | -7.72 | 239 | 1556 | |
| Tang | city | Ireland | 53.53 | -7.78 | 219 | 1996 | |
| Taur | city | Ireland | 52.23 | -9.12 | 895 | 1062 | |
| Tawnyinah | city | Ireland | 53.90 | -8.77 | 429 | 1454 | |
| Terenure | city | Ireland | 53.31 | -6.29 | 180 | 320273 | |
| Termonbarry | city | Ireland | 53.75 | -7.92 | 216 | 1505 | |
| The Bush | city | Ireland | 53.98 | -6.20 | 0 | 1936 | |
| The Crockan | city | Ireland | 53.52 | -6.43 | 236 | 7300 | |
| Thomas Street | city | Ireland | 53.47 | -8.22 | 249 | 1055 | |
| Tievemore | city | Ireland | 54.58 | -7.77 | 1210 | 1589 | |
| Tinalira | city | Ireland | 52.18 | -7.73 | 495 | 1060 | |
| Tincoora | city | Ireland | 52.10 | -8.87 | 593 | 1426 | |
| Tinglas | city | Ireland | 53.39 | -6.30 | 62 | 199166 | |
| Tinny Park | city | Ireland | 53.68 | -8.38 | 249 | 1184 | |
| Tiragarvan | city | Ireland | 53.98 | -6.77 | 252 | 5457 | |
| Tirraboy | city | Ireland | 55.25 | -7.15 | 82 | 1381 | |
| Toberdan | city | Ireland | 53.53 | -8.07 | 246 | 1327 | |
| Tonduff | city | Ireland | 55.20 | -7.52 | 252 | 840 | |
| Toomard | city | Ireland | 53.53 | -8.47 | 239 | 1096 | |
| Tooreen | city | Ireland | 51.55 | -9.83 | 0 | 68 | |
| Tooreen | city | Ireland | 53.67 | -9.28 | 154 | 1299 | |
| Tooreencahill | city | Ireland | 52.15 | -9.25 | 593 | 1750 | |
| Tooreengarriv | city | Ireland | 52.17 | -9.28 | 744 | 1456 | |
| Toormakeady | city | Ireland | 53.65 | -9.37 | 193 | 380 | |
| Tourin | city | Ireland | 52.12 | -7.87 | 131 | 1786 | |
| Trough | city | Ireland | 52.73 | -8.62 | 229 | 16975 | |
| Tully | city | Ireland | 53.23 | -9.48 | 0 | 871 | |
| Tullylease | city | Ireland | 52.30 | -8.95 | 508 | 1505 | |
| Tullymurray | city | Ireland | 54.13 | -8.10 | 190 | 796 | |
| Tullynahinera | city | Ireland | 54.08 | -6.80 | 498 | 2434 | |
| Tullynahinnera | city | Ireland | 54.08 | -6.80 | 498 | 2434 | |
| Twopothouse | city | Ireland | 52.18 | -8.68 | 459 | 7246 | |
| Tyholland | city | Ireland | 54.25 | -6.90 | 213 | 3725 | |
| Tyholland Bridge | city | Ireland | 54.25 | -6.90 | 213 | 3725 |