- Maddenstown
- Malin
- Manorcunningham
- Marino
- Meenlaragh
- Milford
- Millford
- Milltown
- Milltown
- Milltown
- Miltown Malbay
- Moate
- Moate
- Model Village
- Mogeely
- Mohill
- Monard
- Moneenroe
- Moneygall
- Monivea
- Monkstown
- Mooncoin
- Moone
- Moroe
- Mount Merrion
- Mountbellew
- Mountcharles
- Mountmellick
- Mountrath
- Mountshannon
- Moville
- Moycullen
- Moylough
- Moyross
- Mucklagh
- Muff
- Mullagh
- Mullaghmore
- Mullinahone
- Mullinavat
- Mulranny
- Multyfarnham
- Mungret
- Murntown
- Myshall