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- (Mayo County) Mullaghnacross
- (Mayo County) Meelick
- (Mayo County) Moyne
- (Mayo County) Mullafarry
- (Roscommon) Mantua
- (Mayo County) Muingerroon Island
- (Mayo County) Muingerroon
- (Mayo County) Muingnanarnad
- (Mayo County) Muingmore
- (Mayo County) Manraghrory
- (Mayo County) Monemanragh
- (Mayo County) Muingerroon North
- (Sligo) Mullaghmore
- (County Galway) Milltown
- (Mayo County) Mulranny
- (Mayo County) Murrisk
- (County Galway) Monivea
- (County Galway) Moylough
- (County Galway) Mountbellew
- (County Leitrim) Mohill
- (County Leitrim) Manorhamilton
- (County Galway) Moycullen