| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Tamney | city | County Donegal | Ireland | 55.2 | -7.6833333 | 167 | 1827 |
| Tangaveane | city | County Donegal | Ireland | 54.7927778 | -8.1716667 | 695 | 2315 |
| Taughboy | city | County Donegal | Ireland | 54.7536111 | -7.8344444 | 498 | 2429 |
| Tawny | city | County Donegal | Ireland | 54.6244444 | -8.6008333 | 62 | 804 |
| Tawny | city | County Donegal | Ireland | 55.2 | -7.6833333 | 167 | 1827 |
| Teelin | city | County Donegal | Ireland | 54.6347222 | -8.6416667 | 0 | 1616 |
| Templemoyle | city | County Donegal | Ireland | 55.2852778 | -7.2125 | 32 | 2193 |
| Termon | city | County Donegal | Ireland | 55.0491667 | -7.8163889 | 488 | 2301 |
| The Point | city | County Donegal | Ireland | 55.1722222 | -7.7366667 | 29 | 1733 |
| Thompsons Town | city | County Donegal | Ireland | 55.0780556 | -7.3061111 | 246 | 10103 |
| Three Trees | city | County Donegal | Ireland | 55.1136111 | -7.2125 | 0 | 3621 |
| Tieveborne | city | County Donegal | Ireland | 55.0644444 | -7.4291667 | 22 | 2583 |
| Tievelough | city | County Donegal | Ireland | 54.8097222 | -8.1508333 | 577 | 2315 |
| Tirinisk | city | County Donegal | Ireland | 54.7966667 | -7.6113889 | 124 | 2327 |
| Tober | city | County Donegal | Ireland | 54.9563889 | -7.5013889 | 377 | 2309 |
| Toberkeen | city | County Donegal | Ireland | 54.9380556 | -8.3808333 | 209 | 1584 |
| Tonduff | city | County Donegal | Ireland | 54.8275 | -7.9477778 | 446 | 2315 |
| Tops | city | County Donegal | Ireland | 54.8502778 | -7.5980556 | 278 | 2315 |
| Treantagh | city | County Donegal | Ireland | 55 | -7.8427778 | 236 | 2307 |
| Treantagh | city | County Donegal | Ireland | 54.9266667 | -7.4875 | 114 | 2455 |
| Trooperstown | city | County Donegal | Ireland | 55.0602778 | -7.385 | 36 | 4964 |
| Tullagh | city | County Donegal | Ireland | 55.1547222 | -7.7511111 | 196 | 2076 |
| Tullamore | city | County Donegal | Ireland | 54.5211111 | -8.1780556 | 203 | 2071 |
| Tully | city | County Donegal | Ireland | 54.5119444 | -8.0661111 | 980 | 2434 |
| Tully | city | County Donegal | Ireland | 54.5552778 | -8.063889 | 1013 | 2338 |
| Tully Beg | city | County Donegal | Ireland | 54.8041667 | -8.3805556 | 52 | 1977 |
| Tully More | city | County Donegal | Ireland | 54.7919444 | -8.4 | 22 | 1977 |
| Tully Rossnakill | city | County Donegal | Ireland | 55.1833333 | -7.6833333 | 137 | 1827 |
| Tullybegly | city | County Donegal | Ireland | 54.9458333 | -7.5919444 | 223 | 2110 |
| Tullybrook | city | County Donegal | Ireland | 54.6319444 | -8.0788889 | 203 | 2297 |
| Tullydush | city | County Donegal | Ireland | 55.1175 | -7.3977778 | 354 | 2428 |
| Tullykinroe | city | County Donegal | Ireland | 54.54 | -7.9066667 | 364 | 1700 |
| Tullykonwar | city | County Donegal | Ireland | 54.7575 | -8.3038889 | 498 | 2318 |
| Tullylark Bridge | city | County Donegal | Ireland | 54.5838889 | -7.7833333 | 971 | 2801 |
| Tullylinn | city | County Donegal | Ireland | 54.6252778 | -7.7155556 | 475 | 3296 |
| Tullymore | city | County Donegal | Ireland | 54.5211111 | -8.1780556 | 203 | 2071 |
| Tullynaglack | city | County Donegal | Ireland | 54.72 | -8.2125 | 259 | 2321 |
| Tullyonven | city | County Donegal | Ireland | 54.9225 | -7.4711111 | 65 | 2455 |
| Tullyrap | city | County Donegal | Ireland | 54.8572222 | -7.6325 | 196 | 2314 |
| Tullyvoos | city | County Donegal | Ireland | 54.6158333 | -8.2777778 | 3 | 748 |
| Ture | city | County Donegal | Ireland | 55.0855556 | -7.2477778 | 0 | 3621 |
| Turk | city | County Donegal | Ireland | 55.1666667 | -7.3219444 | 488 | 2296 |
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