The Welsh village of Efailwen is located within the county of Dyfed and has a population of approximately 1,000.
Most of Efailwen is governed by Sir Gaerfyrddin - Carmarthenshire council with the remainder being in the area of Sir Benfro - Pembrokeshire council
Efailwen is policed by Dyfed-Powys Police
The largest Parliamentary Constituency in Efailwen is Carmarthen West and South Pembrokeshire (66.67%) with the remainder being in Preseli Pembrokeshire (33.33%)
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