M
- (Sligo) Moytirra
- (Sligo) Maguins Island
- (Sligo) Magheraboy
- (Sligo) Milltown
- (Sligo) Moneylahan
- (Sligo) Milk Haven
- (Sligo) Moneygold
- (Sligo) Mullaghnaneane
- (County Leitrim) Mullaghboy
- (County Leitrim) Murhaun
- (County Leitrim) Moher
- (County Leitrim) Mayo
- (County Leitrim) Morerah
- (County Leitrim) Meenymore
- (County Leitrim) Meenkeeragh
- (County Leitrim) Munnagashel
- (County Leitrim) Mullanyduffy
- (County Galway) Muckareaghederdauhaulia
- (County Galway) Muckanaghkillew
- (County Galway) Magheramore
- (County Galway) Mulroog
- (County Galway) Mweenisharan
- (County Galway) Mweenish Island
- (County Galway) Moneen East
- (County Galway) Manninard
- (County Galway) Moneymore
- (County Galway) Muckrush
- (County Galway) Mace
- (County Galway) Montiagh
- (County Galway) Monroe