| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Mannion's Cross Roads | city | County Offaly | Ireland | 53.3255556 | -7.8830556 | 249 | 2674 |
| Mannionʼs Cross Roads | city | County Offaly | Ireland | 53.3255556 | -7.8830556 | 249 | 2674 |
| Marshbrook | city | County Offaly | Ireland | 53.3927778 | -7.6855556 | 252 | 2921 |
| Meclaghans Cross Roads | city | County Offaly | Ireland | 53.2572222 | -7.4275 | 246 | 2668 |
| Millbrook Bridge | city | County Offaly | Ireland | 53.2175 | -7.7972222 | 216 | 2657 |
| Monasteroris | city | County Offaly | Ireland | 53.3494444 | -7.0802778 | 347 | 4368 |
| Moneygall | city | County Offaly | Ireland | 52.8802778 | -7.9586111 | 501 | 2738 |
| Moneyguid | city | County Offaly | Ireland | 53.1955556 | -7.4433333 | 383 | 2726 |
| Monument Cross Roads | city | County Offaly | Ireland | 53.1833333 | -7.5922222 | 291 | 2692 |
| Moorock | city | County Offaly | Ireland | 53.3425 | -7.7025 | 232 | 2759 |
| Mount Briscoe | city | County Offaly | Ireland | 53.3113889 | -7.2647222 | 331 | 2653 |
| Mountbolus | city | County Offaly | Ireland | 53.1877778 | -7.625 | 285 | 2692 |
| Muckinish | city | County Offaly | Ireland | 53.1880556 | -8.0494444 | 180 | 2715 |
| Muine Gall | city | County Offaly | Ireland | 52.8802778 | -7.9586111 | 501 | 2738 |
| Mullacrew | city | County Offaly | Ireland | 53.2016667 | -7.6269444 | 275 | 2675 |
| Murphy's Bridge | city | County Offaly | Ireland | 53.3230556 | -7.4336111 | 288 | 2804 |
| Murphyʼs Bridge | city | County Offaly | Ireland | 53.3230556 | -7.4336111 | 288 | 2804 |
| Myrtlegrove | city | County Offaly | Ireland | 52.9191667 | -7.9547222 | 374 | 2696 |
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