- Macroom
- Maddenstown
- Malahide
- Malin
- Mallow
- Manorcunningham
- Manorhamilton
- Marino
- Maynooth
- Meenlaragh
- Midleton
- Milford
- Millford
- Millstreet
- Milltown
- Milltown
- Milltown
- Milltown
- Milltown Malbay
- Mitchelstown
- Moate
- Moate
- Model Village
- Mogeely
- Mohill
- Monaghan
- Monard
- Monasterevin
- Moneenroe
- Moneygall
- Monivea
- Monkstown
- Mooncoin
- Moone
- Moroe
- Mount Merrion
- Mountbellew
- Mountcharles
- Mountmellick
- Mountrath
- Mountshannon
- Moville
- Moycullen
- Moylough
- Moyross
- Mucklagh
- Muff
- Mullagh
- Mullaghmore
- Mullinahone
- Mullinavat
- Mullingar
- Mulranny
- Multyfarnham
- Mungret
- Murntown
- Myshall
