B
- (Mayo County) Belfarsad
- (Mayo County) Bellanasally
- (Mayo County) Bleanmore Island
- (Mayo County) Bellagarvaun
- (Mayo County) Burrishoole Abbey
- (Mayo County) Bofeenaun
- (Mayo County) Ballynagoraher
- (Mayo County) Ballynafulla
- (Mayo County) Ballyknock
- (Mayo County) Bunduvowen
- (Mayo County) Ballynew
- (Mayo County) Ballinvilla
- (Mayo County) Burren
- (Mayo County) Balloor
- (Mayo County) Ballygommon
- (Mayo County) Ballyguin
- (Mayo County) Boleyard
- (Mayo County) Ballymiles Bridge
- (Mayo County) Ballygarriff
- (Mayo County) Bleanmore
- (Mayo County) Brackwanshagh
- (Mayo County) Ballymacredmona
- (Mayo County) Bunnafinglas
- (Mayo County) Behy Bridge
- (Mayo County) Breaghwy
- (Mayo County) Boyhollagh
- (Sligo) Ballynamona
- (Sligo) Ballymoghany
- (Sligo) Baunrosmore
- (Sligo) Ballymoneen