| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Gallowshill | city | Mayo | Ireland | 54.26 | -9.33 | 259 | 1008 |
| Gaoth Saile | city | Mayo | Ireland | 54.11 | -9.90 | 3 | 822 |
| Garbhchluanach | city | Mayo | Ireland | 54.09 | -9.24 | 85 | 1790 |
| Garhawnagh | city | Mayo | Ireland | 53.80 | -9.10 | 830 | 1830 |
| Garraghill | city | Mayo | Ireland | 53.91 | -9.24 | 164 | 2086 |
| Garranard | city | Mayo | Ireland | 54.18 | -9.35 | 187 | 797 |
| Garrow | city | Mayo | Ireland | 53.77 | -9.50 | 272 | 7077 |
| Garrowmore | city | Mayo | Ireland | 53.62 | -9.15 | 180 | 1844 |
| Garrycloonagh | city | Mayo | Ireland | 54.09 | -9.24 | 85 | 1790 |
| Glacknagloghraha | city | Mayo | Ireland | 54.00 | -10.19 | 1151 | 312 |
| Gladree | city | Mayo | Ireland | 54.26 | -10.06 | 232 | 712 |
| Glassillaun | city | Mayo | Ireland | 53.89 | -9.92 | 209 | 551 |
| Gleann Aolain | city | Mayo | Ireland | 53.90 | -9.41 | 262 | 793 |
| Gleann Chaisell | city | Mayo | Ireland | 54.18 | -9.88 | 278 | 785 |
| Gleann Chuilinn Íochtarach | city | Mayo | Ireland | 54.18 | -9.73 | 232 | 409 |
| Gleann Iolra | city | Mayo | Ireland | 54.30 | -9.44 | 830 | 394 |
| Gleann Lára | city | Mayo | Ireland | 54.29 | -9.99 | 62 | 1194 |
| Gleann Lára | city | Mayo | Ireland | 53.96 | -9.50 | 830 | 667 |
| Gleann Teamhráin | city | Mayo | Ireland | 53.88 | -8.80 | 285 | 1446 |
| Gleann na Muaidhe | city | Mayo | Ireland | 54.24 | -9.70 | 180 | 323 |
| Glebe | city | Mayo | Ireland | 53.80 | -9.21 | 147 | 1916 |
| Glenamoy | city | Mayo | Ireland | 54.24 | -9.70 | 180 | 323 |
| Glencastle | city | Mayo | Ireland | 54.18 | -9.88 | 278 | 785 |
| Glencullin Lower | city | Mayo | Ireland | 54.18 | -9.73 | 232 | 409 |
| Glencullin Upper | city | Mayo | Ireland | 54.17 | -9.67 | 830 | 132 |
| Glendaduff | city | Mayo | Ireland | 54.03 | -9.06 | 830 | 1138 |
| Glendahurk Bridge | city | Mayo | Ireland | 53.92 | -9.66 | 111 | 488 |
| Glendavoolagh | city | Mayo | Ireland | 54.00 | -9.51 | 964 | 232 |
| Glenedagh | city | Mayo | Ireland | 54.22 | -9.38 | 206 | 522 |
| Glenglassra | city | Mayo | Ireland | 54.31 | -9.50 | 187 | 113 |
| Glenisland | city | Mayo | Ireland | 53.90 | -9.41 | 262 | 793 |
| Glenlara | city | Mayo | Ireland | 53.96 | -9.50 | 830 | 667 |
| Glenlara | city | Mayo | Ireland | 54.29 | -9.99 | 62 | 1194 |
| Glenlassra River | city | Mayo | Ireland | 54.31 | -9.50 | 187 | 113 |
| Glenmullynaha | city | Mayo | Ireland | 53.92 | -8.75 | 830 | 1498 |
| Glenmullynaha Cross Roads | city | Mayo | Ireland | 53.92 | -8.75 | 830 | 1498 |
| Glennanean Bridge | city | Mayo | Ireland | 53.92 | -9.82 | 62 | 471 |
| Glentavraun | city | Mayo | Ireland | 53.88 | -8.80 | 285 | 1446 |
| Glenthomas | city | Mayo | Ireland | 53.94 | -9.70 | 830 | 486 |
| Glenulra | city | Mayo | Ireland | 54.30 | -9.44 | 830 | 394 |
| Gneeve | city | Mayo | Ireland | 53.86 | -9.18 | 157 | 2276 |
| Gob an Choire | city | Mayo | Ireland | 53.93 | -9.94 | 0 | 908 |
| Goolamore | city | Mayo | Ireland | 54.13 | -9.82 | 206 | 468 |
| Gorlawarla | city | Mayo | Ireland | 53.86 | -9.54 | 101 | 3894 |
| Gort | city | Mayo | Ireland | 53.95 | -9.25 | 213 | 757 |
| Gort Liatuile | city | Mayo | Ireland | 54.25 | -9.63 | 209 | 228 |
| Gort Meille | city | Mayo | Ireland | 54.23 | -9.86 | 157 | 836 |
| Gort an Chairn | city | Mayo | Ireland | 54.27 | -9.80 | 830 | 939 |
| Gortaphuill | city | Mayo | Ireland | 53.77 | -9.16 | 170 | 1647 |
| Gortaroe | city | Mayo | Ireland | 53.81 | -9.50 | 288 | 7957 |
| Gortawarla | city | Mayo | Ireland | 53.86 | -9.54 | 101 | 3894 |
| Gortbaun | city | Mayo | Ireland | 53.78 | -9.37 | 219 | 1367 |
| Gortbaun | city | Mayo | Ireland | 53.79 | -9.36 | 219 | 1447 |
| Gortbrack | city | Mayo | Ireland | 54.27 | -10.01 | 232 | 1456 |
| Gortbrack North | city | Mayo | Ireland | 54.25 | -9.85 | 236 | 779 |
| Gortbrack South | city | Mayo | Ireland | 54.03 | -9.81 | 255 | 241 |
| Gorteen | city | Mayo | Ireland | 53.84 | -9.50 | 183 | 6633 |
| Gorteen | city | Mayo | Ireland | 53.93 | -9.09 | 108 | 1900 |
| Gorteennamuck | city | Mayo | Ireland | 54.00 | -9.16 | 183 | 2077 |
| Gortfahy | city | Mayo | Ireland | 53.90 | -9.62 | 6 | 531 |
| Gortlahan | city | Mayo | Ireland | 53.88 | -9.18 | 127 | 2135 |
| Gortleatilla | city | Mayo | Ireland | 54.25 | -9.63 | 209 | 228 |
| Gortmellia | city | Mayo | Ireland | 54.23 | -9.86 | 157 | 836 |
| Gortmore | city | Mayo | Ireland | 54.30 | -9.36 | 177 | 492 |
| Gortmore | city | Mayo | Ireland | 54.17 | -9.79 | 242 | 574 |
| Gortnadrehy | city | Mayo | Ireland | 54.01 | -9.16 | 249 | 2023 |
| Gortnaheltia | city | Mayo | Ireland | 53.95 | -9.47 | 374 | 679 |
| Gortnahurra | city | Mayo | Ireland | 54.13 | -9.40 | 232 | 774 |
| Gortnasmuttaun | city | Mayo | Ireland | 53.82 | -9.25 | 154 | 7952 |
| Goulaun | city | Mayo | Ireland | 54.01 | -9.56 | 370 | 149 |
| Gowel | city | Mayo | Ireland | 53.78 | -9.40 | 830 | 1441 |
| Graffa | city | Mayo | Ireland | 53.87 | -9.36 | 249 | 3802 |
| Graffa Beg | city | Mayo | Ireland | 53.86 | -9.35 | 206 | 8702 |
| Graffa More | city | Mayo | Ireland | 53.86 | -9.35 | 223 | 6676 |
| Graffy | city | Mayo | Ireland | 54.07 | -9.05 | 226 | 1338 |
| Graffy | city | Mayo | Ireland | 53.99 | -9.00 | 206 | 1716 |
| Graffy | city | Mayo | Ireland | 53.85 | -9.17 | 232 | 2142 |
| Graghil | city | Mayo | Ireland | 54.27 | -9.86 | 213 | 684 |
| Grallagh | city | Mayo | Ireland | 53.90 | -9.10 | 206 | 1812 |
| Greamhchoill | city | Mayo | Ireland | 54.27 | -9.86 | 213 | 684 |
| Greenans | city | Mayo | Ireland | 53.95 | -9.26 | 380 | 828 |
| Greenaun | city | Mayo | Ireland | 53.96 | -9.75 | 830 | 326 |
| Greeve | city | Mayo | Ireland | 53.86 | -9.18 | 157 | 2276 |
| Gregnafyla | city | Mayo | Ireland | 53.96 | -9.07 | 255 | 1888 |
| Greyfort | city | Mayo | Ireland | 54.08 | -9.08 | 164 | 2396 |
| Gubavilla | city | Mayo | Ireland | 54.12 | -9.92 | 3 | 968 |
| Guheatacaduff | city | Mayo | Ireland | 53.97 | -10.23 | 0 | 140 |
| Gweesalia | city | Mayo | Ireland | 54.11 | -9.90 | 3 | 822 |
| Gweeshadan | city | Mayo | Ireland | 53.79 | -9.20 | 154 | 1501 |