- Meneen
- Middletown
- Midfield
- Milebush
- Millerhill
- Moat
- Monamore
- Monard
- Monemanragh
- Money
- Moneybeg Island
- Monkellys Rocks
- Moorbrook
- Mountain
- Mountaincommon
- Moyhastin
- Moylaw
- Moyna
- Moyne
- Moynish More
- Moyny
- Moyrahan
- Muckanagh
- Muckanagh
- Muckinish
- Mucklagh
- Muingerroon
- Muingerroon Bridge
- Muingerroon Island
- Muingerroon North