| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Maghereagh Cross | city | Lu | Ireland | 54.01 | -6.52 | 200 | 3278 |
| Mainistir Bhuithe | city | Lu | Ireland | 53.77 | -6.40 | 830 | 7264 |
| Mansfieldstown | city | Lu | Ireland | 53.91 | -6.50 | 59 | 3246 |
| Marsh Farm | city | Lu | Ireland | 53.94 | -6.38 | 0 | 10353 |
| Marsh South | city | Lu | Ireland | 54.00 | -6.35 | 0 | 16154 |
| Martin's Cross | city | Lu | Ireland | 53.86 | -6.31 | 22 | 2042 |
| Martin’s Cross | city | Lu | Ireland | 53.86 | -6.31 | 22 | 2042 |
| Milltown | city | Lu | Ireland | 53.82 | -6.31 | 157 | 3134 |
| Monasterboice | city | Lu | Ireland | 53.77 | -6.40 | 830 | 7264 |
| Moneymore | city | Lu | Ireland | 53.73 | -6.35 | 32 | 32886 |
| Mullabohy Cross Roads | city | Lu | Ireland | 53.98 | -6.50 | 118 | 4615 |
| Mullach an Dúdálaigh | city | Lu | Ireland | 54.02 | -6.39 | 3 | 31562 |
| Mullacrew | city | Lu | Ireland | 53.94 | -6.54 | 114 | 2815 |
| Murrays Cross | city | Lu | Ireland | 53.81 | -6.30 | 101 | 3236 |