- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 53°0'6"N 3°5'48"W
- Eastings/Northings: 326500, 345500
- OS Grid: SJ265455
- Mapcode Local: GBR 71.GY0V
- Mapcode Global: WH77Z.DTM4
Location and coordinates are for the approximate centre of Trefechan within this administrative area.
Geographic features and populated places may cross administrative borders.