M
- (Louth) Mooretown
- (Kilkenny) Monroe
- (Uíbh Fhailí) Monasteroris
- (Wexford) Monaseed
- (Wexford) Monart
- (Wexford) Monamolin
- (Meath) Mitchelstown
- (Westmeath) Milltownpass
- (County Carlow) Milltown
- (Wexford) Milltown
- (Wexford) Millroad
- (Meath) Millbrook
- (Kildare) Milemill
- (An Longfort) Melkagh
- (Wexford) Mayglass
- (Louth) Mansfieldstown
- (Kildare) Maganey
- (Kilkenny) Maddockstown
- (Wicklow) Macreddin
- (Westmeath) Mackans
- (Wicklow) Magherabeg
- (Kilkenny) Moonveen
- (Kilkenny) Milepost Village
- (Kilkenny) Mount Ida
- (Wexford) Monacahee
- (Wexford) Mullinderry Bridge
- (Wexford) Mulmontry Bridge
- (Wexford) Millquarter
- (Wexford) Mylerspark
- (Kilkenny) Molum