- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 52°30'5"N 3°27'43"W
- Eastings/Northings: 300847, 290281
- OS Grid: SO008902
- Mapcode Local: GBR 9L.HG8C
- Mapcode Global: VH5BR.YD28
Location and coordinates are for the approximate centre of Trewythen within this administrative area.
Geographic features and populated places may cross administrative borders.