| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Talach | city | Mayo | Ireland | 54.24 | -10.00 | 22 | 1856 |
| Tallagh | city | Mayo | Ireland | 54.24 | -10.00 | 22 | 1856 |
| Tallagh | city | Mayo | Ireland | 54.02 | -9.85 | 82 | 208 |
| Tanregee | city | Mayo | Ireland | 53.95 | -9.87 | 344 | 450 |
| Tavneena | city | Mayo | Ireland | 53.90 | -8.77 | 830 | 1454 |
| Tawnagh | city | Mayo | Ireland | 54.01 | -9.29 | 167 | 945 |
| Tawnagh | city | Mayo | Ireland | 53.77 | -9.47 | 298 | 4130 |
| Tawnagh Beg | city | Mayo | Ireland | 53.95 | -9.14 | 88 | 1918 |
| Tawnagh More | city | Mayo | Ireland | 53.84 | -9.12 | 249 | 1999 |
| Tawnaghaknaff | city | Mayo | Ireland | 53.87 | -9.10 | 377 | 1739 |
| Tawnaghbeg | city | Mayo | Ireland | 53.99 | -8.61 | 344 | 1079 |
| Tawnaghlaur | city | Mayo | Ireland | 53.98 | -10.15 | 72 | 396 |
| Tawnaghmore | city | Mayo | Ireland | 54.00 | -9.18 | 177 | 1920 |
| Tawnaghmore | city | Mayo | Ireland | 53.99 | -10.15 | 72 | 396 |
| Tawnaghmore | city | Mayo | Ireland | 54.19 | -9.20 | 13 | 1517 |
| Tawnamartela | city | Mayo | Ireland | 53.93 | -9.54 | 830 | 1014 |
| Tawnanasool | city | Mayo | Ireland | 54.12 | -9.79 | 190 | 476 |
| Tawnawoggaun | city | Mayo | Ireland | 53.91 | -9.53 | 154 | 1364 |
| Tawneyshane | city | Mayo | Ireland | 53.91 | -9.28 | 285 | 4249 |
| Tawnycoolawee | city | Mayo | Ireland | 53.87 | -9.32 | 249 | 11295 |
| Tawnyeeny | city | Mayo | Ireland | 53.87 | -9.38 | 249 | 1934 |
| Tawnyemon | city | Mayo | Ireland | 53.82 | -9.46 | 206 | 3972 |
| Tawnyinah | city | Mayo | Ireland | 53.90 | -8.77 | 830 | 1454 |
| Tawnykinaff | city | Mayo | Ireland | 53.94 | -9.27 | 252 | 1038 |
| Tawnylaheen | city | Mayo | Ireland | 53.89 | -9.26 | 180 | 7421 |
| Tawnylough | city | Mayo | Ireland | 53.79 | -9.04 | 252 | 1677 |
| Tawnynaboll | city | Mayo | Ireland | 54.28 | -9.60 | 830 | 210 |
| Tearmann Caithreach | city | Mayo | Ireland | 54.25 | -10.07 | 88 | 665 |
| Termon | city | Mayo | Ireland | 54.11 | -10.11 | 3 | 558 |
| Termoncarragh | city | Mayo | Ireland | 54.25 | -10.07 | 88 | 665 |
| Terrybaun | city | Mayo | Ireland | 53.99 | -9.24 | 88 | 1126 |
| Terryduff | city | Mayo | Ireland | 53.98 | -9.25 | 236 | 1126 |
| The Triangle | city | Mayo | Ireland | 53.78 | -9.40 | 830 | 1298 |
| Tierna | city | Mayo | Ireland | 53.90 | -9.69 | 0 | 425 |
| Tiraun | city | Mayo | Ireland | 54.14 | -10.11 | 3 | 619 |
| Tobernaveen | city | Mayo | Ireland | 54.01 | -9.32 | 246 | 813 |
| Toin an Mhasa | city | Mayo | Ireland | 54.24 | -10.05 | 95 | 1038 |
| Toin an tSeanbhaile | city | Mayo | Ireland | 54.00 | -9.96 | 3 | 848 |
| Toin na hOllai | city | Mayo | Ireland | 54.10 | -10.12 | 3 | 492 |
| Tomboholla | city | Mayo | Ireland | 53.95 | -8.82 | 334 | 1869 |
| Tonacroaghaun | city | Mayo | Ireland | 53.98 | -10.19 | 830 | 289 |
| Tonaderrew | city | Mayo | Ireland | 53.78 | -9.32 | 203 | 2033 |
| Tonamace | city | Mayo | Ireland | 54.24 | -10.05 | 95 | 1038 |
| Tonatanvally | city | Mayo | Ireland | 54.00 | -9.96 | 3 | 848 |
| Toncroaghaun | city | Mayo | Ireland | 53.99 | -10.19 | 1669 | 289 |
| Tongree | city | Mayo | Ireland | 53.98 | -10.13 | 144 | 429 |
| Tonmore | city | Mayo | Ireland | 54.25 | -10.01 | 75 | 1813 |
| Toomore | city | Mayo | Ireland | 53.95 | -9.07 | 147 | 1852 |
| Toor | city | Mayo | Ireland | 53.92 | -9.19 | 101 | 1510 |
| Toorbuck | city | Mayo | Ireland | 53.78 | -9.41 | 400 | 1522 |
| Tooreen | city | Mayo | Ireland | 53.90 | -9.76 | 0 | 337 |
| Tooreen | city | Mayo | Ireland | 53.67 | -9.28 | 154 | 1299 |
| Tooreen | city | Mayo | Ireland | 54.11 | -9.32 | 131 | 1862 |
| Tooreen (Ed Crossmolina North) | city | Mayo | Ireland | 54.11 | -9.32 | 131 | 1862 |
| Toorgarve | city | Mayo | Ireland | 53.86 | -9.49 | 190 | 3011 |
| Toorglass | city | Mayo | Ireland | 54.20 | -9.95 | 0 | 1244 |
| Toormakeady | city | Mayo | Ireland | 53.65 | -9.37 | 193 | 380 |
| Toormore | city | Mayo | Ireland | 53.90 | -9.18 | 114 | 1916 |
| Toormore | city | Mayo | Ireland | 53.79 | -10.03 | 0 | 106 |
| Toormore West | city | Mayo | Ireland | 53.90 | -9.18 | 114 | 1916 |
| Tooromin | city | Mayo | Ireland | 53.87 | -9.05 | 324 | 2170 |
| Toran | city | Mayo | Ireland | 54.14 | -10.11 | 3 | 619 |
| Tourmakeady | city | Mayo | Ireland | 53.65 | -9.37 | 193 | 380 |
| Trawboy | city | Mayo | Ireland | 54.07 | -9.89 | 39 | 464 |
| Trawnanaskil | city | Mayo | Ireland | 54.09 | -9.90 | 0 | 698 |
| Treanagh | city | Mayo | Ireland | 54.16 | -9.33 | 164 | 1320 |
| Treanbeg | city | Mayo | Ireland | 53.94 | -9.56 | 830 | 852 |
| Treannagleragh | city | Mayo | Ireland | 53.86 | -9.05 | 830 | 2301 |
| Treanybrogaun | city | Mayo | Ireland | 53.93 | -9.19 | 85 | 1457 |
| Tree Island | city | Mayo | Ireland | 53.92 | -9.43 | 206 | 659 |
| Trimoge Bridge | city | Mayo | Ireland | 53.91 | -9.02 | 95 | 1973 |
| Tristia | city | Mayo | Ireland | 54.13 | -9.84 | 209 | 590 |
| Troiste | city | Mayo | Ireland | 54.13 | -9.84 | 209 | 590 |
| Tuaim Bhoth Chomhla | city | Mayo | Ireland | 53.95 | -8.82 | 334 | 1869 |
| Tuar Mhic Eadaigh | city | Mayo | Ireland | 53.65 | -9.37 | 193 | 380 |
| Tulachan Dubh | city | Mayo | Ireland | 54.10 | -9.90 | 0 | 793 |
| Tulachán Bán | city | Mayo | Ireland | 54.07 | -9.92 | 0 | 615 |
| Tulaigh Chléibhe | city | Mayo | Ireland | 54.09 | -9.21 | 68 | 7818 |
| Tullaghanbaun | city | Mayo | Ireland | 54.07 | -9.92 | 0 | 615 |
| Tullaghanduff | city | Mayo | Ireland | 54.10 | -9.90 | 0 | 793 |
| Tullaghaunnashammer | city | Mayo | Ireland | 54.12 | -9.83 | 134 | 489 |
| Tully | city | Mayo | Ireland | 53.81 | -9.25 | 154 | 6177 |
| Tully | city | Mayo | Ireland | 53.80 | -9.15 | 298 | 1891 |
| Tully | city | Mayo | Ireland | 53.85 | -9.34 | 190 | 10716 |
| Tully Beg | city | Mayo | Ireland | 53.81 | -9.27 | 157 | 5805 |
| Tully Commons | city | Mayo | Ireland | 53.86 | -9.33 | 187 | 10484 |
| Tullysleva | city | Mayo | Ireland | 54.09 | -9.21 | 68 | 7818 |
| Turlach | city | Mayo | Ireland | 53.88 | -9.22 | 121 | 3231 |
| Turlough | city | Mayo | Ireland | 53.88 | -9.22 | 121 | 3231 |