| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Mainistir Fheorais | city | Offaly | Ireland | 53.35 | -7.08 | 347 | 6018 |
| Mannion's Cross Roads | city | Offaly | Ireland | 53.33 | -7.88 | 249 | 1250 |
| Mannion’s Cross Roads | city | Offaly | Ireland | 53.33 | -7.88 | 249 | 1250 |
| Marshbrook | city | Offaly | Ireland | 53.39 | -7.69 | 252 | 2916 |
| Meclaghans Cross Roads | city | Offaly | Ireland | 53.26 | -7.43 | 246 | 4236 |
| Millbrook Bridge | city | Offaly | Ireland | 53.22 | -7.80 | 216 | 1637 |
| Monasteroris | city | Offaly | Ireland | 53.35 | -7.08 | 347 | 6018 |
| Moneygall | city | Offaly | Ireland | 52.88 | -7.96 | 830 | 1139 |
| Moneyguid | city | Offaly | Ireland | 53.20 | -7.44 | 383 | 1658 |
| Monument Cross Roads | city | Offaly | Ireland | 53.18 | -7.59 | 291 | 1236 |
| Moorock | city | Offaly | Ireland | 53.34 | -7.70 | 232 | 2698 |
| Mount Briscoe | city | Offaly | Ireland | 53.31 | -7.26 | 331 | 1880 |
| Mount Mask | city | Offaly | Ireland | 53.03 | -7.87 | 311 | 1418 |
| Mountbolus | city | Offaly | Ireland | 53.19 | -7.62 | 285 | 1141 |
| Muckinish | city | Offaly | Ireland | 53.19 | -8.05 | 180 | 1011 |
| Muine Gall | city | Offaly | Ireland | 52.88 | -7.96 | 830 | 1139 |
| Mullacrew | city | Offaly | Ireland | 53.20 | -7.63 | 275 | 1185 |
| Murphy's Bridge | city | Offaly | Ireland | 53.32 | -7.43 | 288 | 2286 |
| Murphy’s Bridge | city | Offaly | Ireland | 53.32 | -7.43 | 288 | 2286 |
| Myrtlegrove | city | Offaly | Ireland | 52.92 | -7.95 | 374 | 1331 |
| Múrac | city | Offaly | Ireland | 53.34 | -7.70 | 232 | 2698 |