| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Mahon Bridge | city | Ireland | 52.20 | -7.50 | 249 | 1310 | |
| Maoil an Choirnigh | city | Ireland | 52.05 | -7.60 | 45 | 8616 | |
| Marston | city | Ireland | 52.14 | -8.08 | 167 | 1281 | |
| McGrath's Cross Roads | city | Ireland | 52.19 | -7.47 | 249 | 1812 | |
| McGrath’s Cross Roads | city | Ireland | 52.19 | -7.47 | 249 | 1812 | |
| Millstreet | city | Ireland | 52.16 | -7.75 | 305 | 1148 | |
| Moanbrack | city | Ireland | 52.04 | -7.61 | 321 | 3646 | |
| Moanyarha | city | Ireland | 52.31 | -7.63 | 1158 | 880 | |
| Modelligo | city | Ireland | 52.15 | -7.75 | 249 | 1262 | |
| Moin na mBian | city | Ireland | 52.02 | -7.69 | 830 | 908 | |
| Moin na mBrathar | city | Ireland | 52.02 | -7.65 | 830 | 1971 | |
| Monacaum Cross Roads | city | Ireland | 52.17 | -7.33 | 170 | 1665 | |
| Monacullee | city | Ireland | 52.06 | -7.71 | 830 | 1275 | |
| Monagally | city | Ireland | 52.05 | -7.79 | 393 | 1112 | |
| Monagoush | city | Ireland | 51.99 | -7.61 | 0 | 671 | |
| Monalour | city | Ireland | 52.18 | -7.91 | 830 | 1856 | |
| Monameean | city | Ireland | 52.02 | -7.69 | 830 | 908 | |
| Monamin | city | Ireland | 52.15 | -7.90 | 59 | 2071 | |
| Monamintra | city | Ireland | 52.20 | -7.10 | 127 | 20360 | |
| Monamintra Cross Roads | city | Ireland | 52.21 | -7.08 | 213 | 21338 | |
| Monamraher | city | Ireland | 52.02 | -7.65 | 830 | 1971 | |
| Monard | city | Ireland | 52.21 | -7.97 | 830 | 790 | |
| Monarud | city | Ireland | 52.13 | -7.60 | 262 | 7820 | |
| Monatarriv | city | Ireland | 52.17 | -7.97 | 830 | 1583 | |
| Monyvroe | city | Ireland | 52.11 | -7.84 | 91 | 1692 | |
| Moord | city | Ireland | 51.96 | -7.81 | 13 | 4611 | |
| Mothel | city | Ireland | 52.30 | -7.42 | 249 | 3900 | |
| Mount Beresford | city | Ireland | 52.20 | -7.04 | 226 | 11224 | |
| Mount Bolton | city | Ireland | 52.32 | -7.32 | 190 | 3276 | |
| Mount Druid | city | Ireland | 52.23 | -7.04 | 154 | 13785 | |
| Mount Kennedy | city | Ireland | 52.16 | -7.55 | 830 | 1447 | |
| Mount Rivers | city | Ireland | 52.13 | -7.85 | 78 | 1807 | |
| Mountpatrick | city | Ireland | 52.18 | -7.39 | 196 | 2050 | |
| Mountstuart | city | Ireland | 52.06 | -7.77 | 830 | 993 | |
| Mweelahorna | city | Ireland | 52.05 | -7.60 | 45 | 8616 | |
| Móin an Ghiumhais | city | Ireland | 51.99 | -7.61 | 0 | 671 |