From Marshes, Gwent to all cities in Dyfed starting with letter A
- Aber, Gwent
- Aber Arad, Gwent
- Aber banc, Gwent
- Aber Giâr, Gwent
- Aberaeron, Gwent
- Aberarth, Gwent
- Abercastle, Gwent
- Abercych, Gwent
- Abereiddy, Gwent
- Aberffrwd, Gwent
- Abergorlech, Gwent
- Abergwili, Gwent
- Aberlerry, Gwent
- Abermagwr, Gwent
- Abermeurig, Gwent
- Abernant, Gwent
- Aberporth, Gwent
- Aberystwyth, Gwent
- Achddu, Gwent
- Adpar, Gwent
- Albert Town, Gwent
- Albro Castle, Gwent
- Allt, Gwent
- Alltwalis, Gwent
- Alltyblaca, Gwent
- Ambleston, Gwent
- Ammanford, Gwent
- Amroth, Gwent
- Angle, Gwent
- Ashfield, Gwent