- Bettws Cedewain
- Bettws Disserth
- Bettws-Evan
- Betws Garmon
- Bettws Gwerfil Goch
- Betws
- Betws-y-coed
- Betws yn Rhos
- Bishopston
- Bishton
- Blackrock
- Blaenau-Ffestiniog
- Brynithel
- Blaenavon
- Blaengawr
- Blaengwrach
- Blaengwynfi
- Blaenpenal
- Blaenporth
- Blaenwaun
- Blaina
- Bleddfa
- Bletherston
- Bodedern
- Bodelwyddan
- Bodewryd
- Bodfari
- Bodfean
- Bodorgan
- Boncath