- Marshbrook
- Martin’s Cross
- Martinstown
- Martinstown
- Martinstown
- Martinstown Cross Roads
- Martry
- Maryfield
- Massford Bridge
- Maudlin
- Maudlin
- Maudlin
- Mayglass
- Mayo
- McCartney’s Bridge
- Meadstown
- Meallaghmore
- Meclaghans Cross Roads
- Meelgarrow
- Meelick
- Meenlagh
- Meetings
- Melkagh
- Mellifont
- Mervyn
- Milehouse
- Milemill
- Milepost Village
- Milestown
- Milestown