- Category: Populated Place
- Type: Village
- Latitude/Longitude: 50°3'22"N 5°39'37"W
- Eastings/Northings: 138092, 23771
- OS Grid: SW380237
- Mapcode Local: GBR DXDJ.Q0C
- Mapcode Global: VH05M.TVW6
Location and coordinates are for the approximate centre of Trethewey within this administrative area.
Geographic features and populated places may cross administrative borders.