B
- (Wexford) Boleyvogue
- (Meath) Bohermeen
- (Uíbh Fhailí) Boheraphuca
- (Meath) Bobsville
- (Uíbh Fhailí) Blue Ball
- (Uíbh Fhailí) Bleach Hill
- (Wexford) Blackwater
- (County Carlow) Blacklion
- (An Longfort) Black Islands
- (Meath) Black Bull
- (Kilkenny) Bishopshall
- (County Carlow) Bilboa
- (Meath) Bettystown
- (Meath) Bective
- (Westmeath) Bealin
- (An Longfort) Bawn Cross Roads
- (Kilkenny) Baurscoob
- (Meath) Batterstown
- (An Longfort) Barry
- (Wexford) Barronstown
- (Wexford) Barrack Village
- (Kilkenny) Barrabehy
- (County Carlow) Barmona
- (Wexford) Bannow Island
- (Louth) Baltray
- (Meath) Balrath
- (Westmeath) Balnacart
- (Wexford) Ballywilliam
- (Wexford) Ballyvaldon
- (Kilkenny) Ballyquin