- Maam Cross
- Mace
- Magheramore
- Mainistir
- Malivey
- Manninard
- Mason Island
- Maum
- Maum East
- Maum West
- Meelick
- Meeneen
- Menlough
- Menlough
- Milltown
- Mira
- Moat Bridge
- Móinín na Ruaige
- Moneen East
- Moneymore
- Monivea
- Monroe
- Montiagh
- Montpelier
- Moorfield Cross Roads
- Mount Bellew Bridge
- Mountbellew
- Moy
- Moyard
- Moyascragh