M
- (Wicklow) Marsh
- (Wexford) Money
- (Wexford) Monbay Upper
- (Wexford) Motabower
- (Wicklow) Mill Land
- (Wexford) Monaseed Demesne
- (Wicklow) Money Upper
- (Wicklow) Minmore
- (County Carlow) Minvaud Upper
- (County Carlow) Minvaud Lower
- (Kildare) Mylerstown
- (Kildare) Mullycagh
- (An Longfort) Mullawornia
- (An Longfort) Mullanalaghta
- (Meath) Mullagh
- (Louth) Mullacrew
- (Westmeath) Moyvoughly
- (Westmeath) Moyvore
- (Kildare) Moyvally
- (An Longfort) Moyne Cross Roads
- (An Longfort) Moyne
- (Meath) Moynalty
- (Kilkenny) Moyhora
- (An Longfort) Moydow
- (Meath) Moyagher
- (Kilkenny) Mount Pleasant
- (County Carlow) Mount Neill
- (Wexford) Mount George
- (Uíbh Fhailí) Mountbolus
- (Meath) Mornington