M
- (Mayo County) Money
- (Mayo County) Meneen
- (Mayo County) Magheranagay
- (Mayo County) Monard
- (Mayo County) Monamore
- (Mayo County) Muckanagh
- (Mayo County) Milebush
- (Mayo County) Millerhill
- (Mayo County) Magherafadda
- (Mayo County) Murrisknaboll
- (Mayo County) Monkellys Rocks
- (Mayo County) Mucklagh
- (Mayo County) Mace North
- (Mayo County) Mace South
- (Mayo County) Mahanagh
- (Mayo County) Moorbrook
- (Mayo County) Moyhastin
- (Mayo County) Moyna
- (Mayo County) Moneybeg Island
- (Mayo County) Moat
- (Mayo County) Massbrook South
- (Mayo County) Massbrook Upper
- (Mayo County) Mweelin
- (County Galway) Mainistir
- (Mayo County) Magheraboy
- (Mayo County) Magheraboy
- (Mayo County) Mace Middle
- (Mayo County) Mace Lower
- (Mayo County) Murneen North
- (Mayo County) Magheramore