- Category: Populated Place
- Type: Village
- Latitude/Longitude: 51°53'44"N 4°42'38"W
- Eastings/Northings: 213594, 225385
- OS Grid: SN135253
- Mapcode Local: GBR CX.QQ7H
- Mapcode Global: VH2NM.9MK1
Location and coordinates are for the approximate centre of Efailwen within this administrative area.
Geographic features and populated places may cross administrative borders.