| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Aasleagh | city | Mayo | Ireland | 53.62 | -9.67 | 318 | 199 |
| Abbeytown | city | Mayo | Ireland | 54.17 | -9.16 | 3 | 4932 |
| Acaill | city | Mayo | Ireland | 53.93 | -9.91 | 0 | 698 |
| Achadh Dúin | city | Mayo | Ireland | 54.27 | -10.03 | 275 | 1280 |
| Achill | city | Mayo | Ireland | 53.93 | -9.91 | 0 | 698 |
| Achill Sound | city | Mayo | Ireland | 53.93 | -9.94 | 0 | 908 |
| Acres | city | Mayo | Ireland | 53.79 | -9.07 | 347 | 1595 |
| Aghadooey Glebe | city | Mayo | Ireland | 53.90 | -9.57 | 16 | 1154 |
| Aghadoon | city | Mayo | Ireland | 54.27 | -10.03 | 275 | 1280 |
| Aghadrinagh | city | Mayo | Ireland | 53.83 | -9.30 | 164 | 12320 |
| Aghagower | city | Mayo | Ireland | 53.75 | -9.47 | 830 | 2519 |
| Aghagowla | city | Mayo | Ireland | 53.85 | -9.50 | 177 | 4001 |
| Aghaloonteen | city | Mayo | Ireland | 54.02 | -9.34 | 830 | 775 |
| Aghalusky | city | Mayo | Ireland | 53.87 | -9.11 | 265 | 1828 |
| Aghamore | city | Mayo | Ireland | 53.82 | -8.82 | 223 | 1734 |
| Aghaward | city | Mayo | Ireland | 53.94 | -9.09 | 78 | 1918 |
| Aghleam | city | Mayo | Ireland | 54.12 | -10.10 | 3 | 588 |
| Aghoos | city | Mayo | Ireland | 54.25 | -9.79 | 239 | 885 |
| Ail Ti Conain | city | Mayo | Ireland | 54.21 | -9.96 | 3 | 1425 |
| Aille | city | Mayo | Ireland | 53.77 | -9.41 | 383 | 1238 |
| Aillemore | city | Mayo | Ireland | 53.71 | -9.87 | 259 | 574 |
| Alliconaun | city | Mayo | Ireland | 54.21 | -9.96 | 3 | 1425 |
| Altbaun | city | Mayo | Ireland | 53.87 | -9.05 | 830 | 2170 |
| Altderg | city | Mayo | Ireland | 54.03 | -9.97 | 3 | 619 |
| Altnabrocky | city | Mayo | Ireland | 54.08 | -9.57 | 255 | 140 |
| An Abhainn Dubh | city | Mayo | Ireland | 53.95 | -9.84 | 16 | 437 |
| An Abhainn Dubh | city | Mayo | Ireland | 54.03 | -9.68 | 370 | 146 |
| An Aírd Mhór | city | Mayo | Ireland | 54.20 | -10.01 | 0 | 908 |
| An Baile Glas | city | Mayo | Ireland | 53.73 | -9.17 | 177 | 1294 |
| An Baile Glas | city | Mayo | Ireland | 54.26 | -9.91 | 3 | 928 |
| An Baile Glas | city | Mayo | Ireland | 54.23 | -9.32 | 206 | 1199 |
| An Baile Glas | city | Mayo | Ireland | 54.15 | -9.35 | 183 | 1169 |
| An Baile Nua | city | Mayo | Ireland | 54.13 | -10.12 | 3 | 544 |
| An Baile Thuaidh | city | Mayo | Ireland | 53.81 | -9.98 | 9 | 146 |
| An Barr Rua | city | Mayo | Ireland | 53.96 | -8.71 | 380 | 1483 |
| An Bheairic | city | Mayo | Ireland | 54.16 | -10.09 | 0 | 714 |
| An Bhreaclach | city | Mayo | Ireland | 53.95 | -8.79 | 830 | 1788 |
| An Cairthe | city | Mayo | Ireland | 54.15 | -9.03 | 216 | 1218 |
| An Caiseal | city | Mayo | Ireland | 53.96 | -9.97 | 219 | 1315 |
| An Caladh | city | Mayo | Ireland | 53.98 | -9.04 | 232 | 1533 |
| An Caol | city | Mayo | Ireland | 53.97 | -10.08 | 0 | 527 |
| An Carn | city | Mayo | Ireland | 54.23 | -9.29 | 154 | 1424 |
| An Cartúr | city | Mayo | Ireland | 54.13 | -10.09 | 0 | 637 |
| An Cheathru Bheag | city | Mayo | Ireland | 53.90 | -9.63 | 75 | 491 |
| An Cheathru Mhor | city | Mayo | Ireland | 54.21 | -9.83 | 242 | 896 |
| An Cheathru Mhor | city | Mayo | Ireland | 54.25 | -9.28 | 177 | 1353 |
| An Cheathru Mhor | city | Mayo | Ireland | 54.00 | -8.98 | 387 | 1747 |
| An Cheathru Mhor | city | Mayo | Ireland | 53.62 | -9.15 | 180 | 1844 |
| An Cheathrú Bhlaoch | city | Mayo | Ireland | 54.14 | -8.99 | 364 | 872 |
| An Cheathrú Chaol | city | Mayo | Ireland | 54.18 | -9.90 | 177 | 857 |
| An Cheathrú Mhór | city | Mayo | Ireland | 54.28 | -9.33 | 830 | 637 |
| An Chloch Bhreac | city | Mayo | Ireland | 54.00 | -9.33 | 242 | 769 |
| An Choill Mhor | city | Mayo | Ireland | 53.95 | -9.11 | 75 | 2080 |
| An Choill Mhór | city | Mayo | Ireland | 53.88 | -9.50 | 196 | 1663 |
| An Chorrchloch | city | Mayo | Ireland | 54.21 | -9.96 | 0 | 1251 |
| An Chorrchloch | city | Mayo | Ireland | 54.25 | -10.04 | 223 | 1102 |
| An Chrois | city | Mayo | Ireland | 54.20 | -10.07 | 3 | 822 |
| An Chrois | city | Mayo | Ireland | 53.55 | -9.22 | 114 | 1719 |
| An Chrois Thoir | city | Mayo | Ireland | 54.19 | -10.03 | 0 | 875 |
| An Clochar | city | Mayo | Ireland | 54.13 | -10.09 | 0 | 667 |
| An Clochar | city | Mayo | Ireland | 53.84 | -9.47 | 206 | 3718 |
| An Clochar | city | Mayo | Ireland | 53.75 | -9.23 | 160 | 1452 |
| An Clocich Mhoir | city | Mayo | Ireland | 53.87 | -9.95 | 0 | 399 |
| An Cloigeann | city | Mayo | Ireland | 53.97 | -9.84 | 3 | 294 |
| An Cluainín | city | Mayo | Ireland | 54.26 | -10.01 | 177 | 1585 |
| An Cnoc Dubh | city | Mayo | Ireland | 54.16 | -9.21 | 49 | 4161 |
| An Cnoc Mór | city | Mayo | Ireland | 54.02 | -9.18 | 200 | 2034 |
| An Corrán | city | Mayo | Ireland | 53.87 | -9.93 | 3 | 400 |
| An Corrán Buí | city | Mayo | Ireland | 54.30 | -9.79 | 124 | 633 |
| An Creagán Beag | city | Mayo | Ireland | 54.29 | -9.58 | 216 | 186 |
| An Currach Bui | city | Mayo | Ireland | 54.20 | -10.04 | 0 | 851 |
| An Doire | city | Mayo | Ireland | 54.08 | -9.55 | 249 | 203 |
| An Doirin | city | Mayo | Ireland | 53.90 | -9.94 | 0 | 701 |
| An Doirín | city | Mayo | Ireland | 54.00 | -9.42 | 259 | 437 |
| An Droim | city | Mayo | Ireland | 54.18 | -10.08 | 3 | 719 |
| An Droim Riabhach | city | Mayo | Ireland | 54.19 | -10.06 | 3 | 778 |
| An Dumhach Bheag | city | Mayo | Ireland | 53.88 | -9.81 | 0 | 313 |
| An Eachleim | city | Mayo | Ireland | 54.12 | -10.10 | 3 | 588 |
| An Fal Mor | city | Mayo | Ireland | 54.10 | -10.10 | 6 | 498 |
| An Fód Dubh | city | Mayo | Ireland | 54.10 | -10.07 | 0 | 517 |
| An Geata Mor | city | Mayo | Ireland | 54.20 | -10.04 | 3 | 963 |
| An Geata Mór | city | Mayo | Ireland | 54.21 | -10.05 | 3 | 1036 |
| An Ghleadraigh | city | Mayo | Ireland | 54.26 | -10.06 | 232 | 712 |
| An Gort Breac | city | Mayo | Ireland | 54.27 | -10.01 | 232 | 1456 |
| An Gort Breac | city | Mayo | Ireland | 54.25 | -9.85 | 236 | 779 |
| An Gort Breac Theas | city | Mayo | Ireland | 54.03 | -9.81 | 255 | 241 |
| An Gort Breac Thuaidh | city | Mayo | Ireland | 54.25 | -9.85 | 236 | 779 |
| An Gort Mor | city | Mayo | Ireland | 54.30 | -9.36 | 177 | 492 |
| An Gort Mor | city | Mayo | Ireland | 54.17 | -9.79 | 242 | 574 |
| An Grianan | city | Mayo | Ireland | 53.96 | -9.75 | 830 | 326 |
| An Léim | city | Mayo | Ireland | 54.17 | -10.09 | 0 | 678 |
| An Mhaighean | city | Mayo | Ireland | 54.20 | -9.19 | 3 | 1163 |
| An Mhaoilinn | city | Mayo | Ireland | 53.94 | -10.02 | 249 | 986 |
| An Mhoing Mhor | city | Mayo | Ireland | 54.16 | -9.90 | 124 | 931 |
| An Mullach Rua | city | Mayo | Ireland | 54.14 | -10.09 | 0 | 737 |
| An Phairc | city | Mayo | Ireland | 53.91 | -9.20 | 111 | 1826 |
| An Raith | city | Mayo | Ireland | 54.09 | -9.96 | 3 | 491 |
| An Rinn Mhór | city | Mayo | Ireland | 54.04 | -9.23 | 68 | 1165 |
| An Ros | city | Mayo | Ireland | 54.23 | -9.20 | 0 | 1150 |
| An Ros Thiar | city | Mayo | Ireland | 53.92 | -9.24 | 173 | 1561 |
| An Réise | city | Mayo | Ireland | 54.11 | -9.19 | 52 | 9859 |
| An Sian | city | Mayo | Ireland | 53.81 | -9.46 | 249 | 4277 |
| An Sonnach | city | Mayo | Ireland | 53.96 | -8.83 | 213 | 1822 |
| An Sraith Mor | city | Mayo | Ireland | 53.96 | -9.57 | 295 | 380 |
| An Srath Mor | city | Mayo | Ireland | 54.15 | -9.79 | 216 | 537 |
| An Srath Mor | city | Mayo | Ireland | 53.96 | -9.57 | 295 | 380 |
| An Tamhnaigh | city | Mayo | Ireland | 54.01 | -9.29 | 167 | 945 |
| An Tearmann | city | Mayo | Ireland | 54.11 | -10.11 | 3 | 558 |
| An Toin Mhor | city | Mayo | Ireland | 54.25 | -10.01 | 75 | 1813 |
| An Tuar Glas | city | Mayo | Ireland | 54.20 | -9.95 | 0 | 1244 |
| An tEanach | city | Mayo | Ireland | 54.24 | -10.09 | 0 | 584 |
| An tInbhear | city | Mayo | Ireland | 54.24 | -9.87 | 95 | 787 |
| An tSraid | city | Mayo | Ireland | 53.92 | -9.13 | 147 | 1809 |
| An tSraith | city | Mayo | Ireland | 53.68 | -9.33 | 193 | 528 |
| An tSraith | city | Mayo | Ireland | 54.17 | -9.93 | 36 | 770 |
| An tSruthail | city | Mayo | Ireland | 53.52 | -9.09 | 196 | 2454 |
| Annagh | city | Mayo | Ireland | 54.24 | -10.09 | 0 | 584 |
| Annagh | city | Mayo | Ireland | 53.83 | -9.36 | 219 | 3742 |
| Annie Brady Bridge | city | Mayo | Ireland | 54.27 | -9.72 | 124 | 443 |
| Ara | city | Mayo | Ireland | 53.86 | -9.11 | 341 | 1875 |
| Ara North | city | Mayo | Ireland | 53.86 | -9.11 | 341 | 1875 |
| Ard Eoghain | city | Mayo | Ireland | 54.24 | -10.04 | 91 | 1174 |
| Ardagh | city | Mayo | Ireland | 54.10 | -9.23 | 82 | 2068 |
| Ardboley | city | Mayo | Ireland | 53.79 | -9.12 | 830 | 1920 |
| Ardcloon | city | Mayo | Ireland | 53.92 | -9.11 | 147 | 1883 |
| Ardhoom | city | Mayo | Ireland | 53.94 | -9.04 | 88 | 1697 |
| Ardkeen | city | Mayo | Ireland | 53.84 | -9.60 | 3 | 967 |
| Ardmore | city | Mayo | Ireland | 54.20 | -10.01 | 0 | 908 |
| Ardmore Lower | city | Mayo | Ireland | 54.20 | -10.02 | 0 | 891 |
| Ardnaree | city | Mayo | Ireland | 54.11 | -9.15 | 29 | 11372 |
| Ardoley | city | Mayo | Ireland | 53.78 | -9.55 | 200 | 6692 |
| Ardowen | city | Mayo | Ireland | 54.24 | -10.04 | 91 | 1174 |
| Ardvally | city | Mayo | Ireland | 54.14 | -9.12 | 55 | 6869 |
| Ardvarney | city | Mayo | Ireland | 53.90 | -9.30 | 262 | 8571 |
| Ashbrook | city | Mayo | Ireland | 53.91 | -9.11 | 147 | 1855 |
| Askillaun | city | Mayo | Ireland | 54.00 | -9.04 | 305 | 1309 |
| Attavally | city | Mayo | Ireland | 53.77 | -9.30 | 193 | 1730 |
| Attavally | city | Mayo | Ireland | 54.15 | -9.76 | 252 | 525 |
| Atticahill | city | Mayo | Ireland | 53.89 | -9.13 | 249 | 1803 |
| Attimachugh | city | Mayo | Ireland | 54.01 | -9.03 | 830 | 1193 |
| Attireesh | city | Mayo | Ireland | 53.81 | -9.52 | 314 | 8053 |
| Attymass | city | Mayo | Ireland | 54.05 | -9.08 | 200 | 1464 |
| Aughernagalliagh | city | Mayo | Ireland | 54.27 | -10.07 | 255 | 525 |
| Aughness | city | Mayo | Ireland | 54.08 | -9.84 | 124 | 338 |