| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Magheraboy | city | Sligeach | Ireland | 54.2688889 | -8.4944444 | 49 | 2415 |
| Mahanagh | city | Sligeach | Ireland | 53.9769444 | -8.4516667 | 249 | 2589 |
| Masshill | city | Sligeach | Ireland | 54.1047222 | -8.8555556 | 495 | 2674 |
| Metal Bridge | city | Sligeach | Ireland | 54.0719444 | -8.8197222 | 193 | 2675 |
| Milk Haven | city | Sligeach | Ireland | 54.4180556 | -8.5 | 29 | 1317 |
| Milltown | city | Sligeach | Ireland | 54.3394444 | -8.5011111 | 134 | 2117 |
| Moneygold | city | Sligeach | Ireland | 54.4061111 | -8.5094444 | 59 | 1735 |
| Moneylahan | city | Sligeach | Ireland | 54.3980556 | -8.4516667 | 305 | 2446 |
| Moylough | city | Sligeach | Ireland | 54.0305556 | -8.6997222 | 308 | 2311 |
| Moytirra | city | Sligeach | Ireland | 54.0830556 | -8.275 | 334 | 2400 |
| Muingwore | city | Sligeach | Ireland | 54.1663889 | -9.0358333 | 239 | 2186 |
| Mullaghanarry | city | Sligeach | Ireland | 54.0911111 | -8.7211111 | 387 | 2674 |
| Mullaghmore | city | Sligeach | Ireland | 54.4663889 | -8.4486111 | 0 | 679 |
| Mullaghnaneane | city | Sligeach | Ireland | 54.3755556 | -8.5316667 | 118 | 1735 |
| Mullaghroe | city | Sligeach | Ireland | 53.9802778 | -8.4611111 | 249 | 2634 |
| Mullany's Cross | city | Sligeach | Ireland | 54.0691667 | -8.8655556 | 249 | 2655 |
| Mullanyʼs Cross | city | Sligeach | Ireland | 54.0691667 | -8.8655556 | 249 | 2655 |
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