| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Tannersrath | city | Ireland | 52.38 | -7.69 | 134 | 16408 | |
| Tar Bridge | city | Ireland | 52.28 | -7.83 | 252 | 1829 | |
| Templeetney | city | Ireland | 52.40 | -7.62 | 282 | 2993 | |
| Templemichael | city | Ireland | 52.44 | -7.46 | 830 | 1195 | |
| The Four Roads | city | Ireland | 52.59 | -7.67 | 830 | 2327 | |
| Thomastown | city | Ireland | 52.49 | -8.02 | 255 | 1877 | |
| Thomastown Castle | city | Ireland | 52.49 | -8.02 | 255 | 1877 | |
| Tiobraid Árann | city | Ireland | 52.47 | -8.16 | 830 | 6763 | |
| Tipperaria | city | Ireland | 52.47 | -8.16 | 830 | 6763 | |
| Tipperary | city | Ireland | 52.47 | -8.16 | 830 | 6763 | |
| Toberaheena | city | Ireland | 52.35 | -7.75 | 219 | 14838 | |
| Toem | city | Ireland | 52.58 | -8.20 | 282 | 2043 | |
| Tooloone | city | Ireland | 52.44 | -7.83 | 830 | 1476 | |
| Toor | city | Ireland | 52.42 | -7.54 | 853 | 1229 | |
| Tooreen | city | Ireland | 52.65 | -8.14 | 1007 | 992 | |
| Tranagh | city | Ireland | 52.69 | -7.60 | 830 | 1891 | |
| Tubbrid | city | Ireland | 52.31 | -7.94 | 196 | 2149 | |
| Tullohed | city | Ireland | 52.42 | -7.51 | 830 | 1208 | |
| Tullow | city | Ireland | 52.28 | -7.90 | 167 | 1552 | |
| Tullowcossaun | city | Ireland | 52.50 | -7.61 | 377 | 1316 | |
| Twoford Bridges | city | Ireland | 52.61 | -7.89 | 275 | 1960 | |
| Twomilebridge | city | Ireland | 52.36 | -7.64 | 288 | 8053 |