B
- (Mayo County) Beetle Island
- (Mayo County) Buncam
- (Mayo County) Ballymacrah
- (Mayo County) Ballyglass
- (Mayo County) Buckwaria
- (Mayo County) Bush Island
- (Mayo County) Ballyteige
- (Mayo County) Bracklagh
- (Mayo County) Boggy
- (Mayo County) Boleyglass
- (Mayo County) Ballymackeogh
- (Mayo County) Brees
- (Mayo County) Ballinagran
- (Mayo County) Ballinlough
- (Mayo County) Ballintleva
- (Mayo County) Bohamore
- (Mayo County) Bellaburke
- (Mayo County) Balloor West
- (Mayo County) Ballynamarroge
- (Mayo County) Ballykill
- (Mayo County) Botara
- (Mayo County) Brackloon
- (Mayo County) Belclare
- (Mayo County) Ballynacarriga
- (Mayo County) Ballynaboll
- (Mayo County) Ballyshane
- (Mayo County) Balloor
- (Mayo County) Ballinvoash
- (Mayo County) Ballinvoash Lough
- (Mayo County) Bocullin