| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Tankardstown | city | Ireland | 52.41 | -8.65 | 229 | 3097 | |
| Teernahilla | city | Ireland | 52.45 | -8.93 | 252 | 1383 | |
| Templeathea East | city | Ireland | 52.48 | -9.25 | 830 | 1545 | |
| Templeathea West | city | Ireland | 52.47 | -9.29 | 314 | 1658 | |
| Templeglentan | city | Ireland | 52.38 | -9.21 | 830 | 2035 | |
| Thomastown | city | Ireland | 52.38 | -8.63 | 269 | 3752 | |
| Thomastown | city | Ireland | 52.35 | -8.45 | 856 | 1878 | |
| Tinnakilla | city | Ireland | 52.55 | -9.24 | 390 | 1568 | |
| Tobar Phádraig | city | Ireland | 52.60 | -8.71 | 173 | 11112 | |
| Tobermalug | city | Ireland | 52.61 | -8.50 | 229 | 6183 | |
| Tobernea | city | Ireland | 52.37 | -8.60 | 357 | 3331 | |
| Tomdrely | city | Ireland | 52.61 | -9.02 | 13 | 1800 | |
| Tooraleagan | city | Ireland | 52.31 | -8.37 | 830 | 1480 | |
| Tooraree | city | Ireland | 52.53 | -9.25 | 830 | 1645 | |
| Tooreendonnell | city | Ireland | 52.49 | -9.23 | 830 | 1456 | |
| Tooreennagreana | city | Ireland | 52.34 | -9.09 | 974 | 1094 | |
| Toornafulla | city | Ireland | 52.36 | -9.14 | 830 | 1703 | |
| Tour Bridge | city | Ireland | 52.37 | -9.14 | 830 | 1805 | |
| Tulla | city | Ireland | 52.32 | -8.39 | 830 | 1480 | |
| Tulligoline North | city | Ireland | 52.42 | -9.23 | 830 | 2141 | |
| Tulligoline South | city | Ireland | 52.40 | -9.23 | 830 | 2359 | |
| Tullyleague | city | Ireland | 52.54 | -9.30 | 830 | 1926 | |
| Tuogh | city | Ireland | 52.60 | -8.36 | 203 | 3165 |