| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Magowry | city | Ireland | 52.52 | -7.62 | 374 | 1465 | |
| Mardyke | city | Ireland | 52.58 | -7.64 | 830 | 2000 | |
| Markhamstown | city | Ireland | 52.35 | -7.83 | 252 | 2475 | |
| Martfield | city | Ireland | 52.35 | -7.75 | 219 | 13888 | |
| Masterstown | city | Ireland | 52.44 | -7.94 | 249 | 2212 | |
| Maudemount Cross Roads | city | Ireland | 52.56 | -8.08 | 830 | 1775 | |
| Melbourne Bridge | city | Ireland | 52.47 | -7.61 | 206 | 1205 | |
| Middlequarter | city | Ireland | 52.24 | -7.82 | 830 | 1426 | |
| Milestone | city | Ireland | 52.68 | -8.09 | 892 | 953 | |
| Milltown | city | Ireland | 52.60 | -7.93 | 242 | 1691 | |
| Milltownbritton | city | Ireland | 52.42 | -7.65 | 154 | 4096 | |
| Minorstown | city | Ireland | 52.38 | -7.56 | 52 | 1318 | |
| Moanmore | city | Ireland | 52.45 | -8.35 | 377 | 1978 | |
| Moanmore | city | Ireland | 52.53 | -8.21 | 269 | 2387 | |
| Moanvaun | city | Ireland | 52.64 | -8.14 | 987 | 1053 | |
| Moanvaun | city | Ireland | 52.59 | -8.15 | 830 | 1641 | |
| Mocklershill | city | Ireland | 52.51 | -7.81 | 830 | 1383 | |
| Modeshil | city | Ireland | 52.54 | -7.48 | 282 | 1744 | |
| Mogh | city | Ireland | 52.52 | -8.02 | 232 | 1903 | |
| Moglass | city | Ireland | 52.52 | -7.72 | 830 | 1633 | |
| Monaminane | city | Ireland | 52.25 | -8.03 | 1669 | 1122 | |
| Monard | city | Ireland | 52.51 | -8.21 | 377 | 2988 | |
| Monksgrange | city | Ireland | 52.34 | -7.82 | 249 | 2491 | |
| Monroe | city | Ireland | 52.33 | -8.02 | 249 | 934 | |
| Morpeth Bridge | city | Ireland | 52.53 | -8.09 | 328 | 1723 | |
| Mortlestown | city | Ireland | 52.40 | -7.87 | 321 | 2289 | |
| Mount Bruis | city | Ireland | 52.45 | -8.24 | 830 | 1816 | |
| Mount William | city | Ireland | 52.51 | -8.08 | 285 | 1752 | |
| Mounvarrin | city | Ireland | 52.54 | -7.58 | 830 | 1531 | |
| Muileann na hUamhan | city | Ireland | 52.51 | -7.50 | 252 | 1824 | |
| Mullenaranky | city | Ireland | 52.40 | -7.65 | 124 | 5349 | |
| Mullennaglogh | city | Ireland | 52.45 | -7.47 | 830 | 1239 | |
| Mullinahone | city | Ireland | 52.51 | -7.50 | 252 | 1824 | |
| Mullinoly | city | Ireland | 52.50 | -7.50 | 255 | 1789 | |
| Mulllagh | city | Ireland | 52.37 | -7.46 | 62 | 3828 |