B
- (Sligo) Ballynary
- (Sligo) Ballinlig
- (Sligo) Buggagh Bog
- (Sligo) Ballyculleen
- (Sligo) Boleyhownagh
- (County Leitrim) Blackgarden
- (County Leitrim) Bargowla
- (County Leitrim) Braudphark
- (County Galway) Baile an Dúna
- (County Galway) Baile an Fhormna
- (County Galway) Baile an Chaisleáin
- (County Galway) Baile an tSéipéil
- (County Galway) Baile an Lurgain
- (County Galway) Baile an Mhothair
- (County Galway) Baile na Seoigheach
- (County Galway) Baile an Lisín
- (County Galway) Baile an Teampaill
- (County Galway) Baile na Craige
- (Mayo County) Bushfield
- (Mayo County) Bunree
- (Mayo County) Bunnyconnellan
- (Sligo) Bunnanaddan
- (Mayo County) Bunnahowen
- (Mayo County) Bundorragha
- (County Galway) Bullaun
- (Mayo County) Brownhall Demesne
- (Mayo County) Brockagh
- (County Leitrim) Bridgetown
- (Roscommon) Bridgetown
- (Roscommon) Brideswell