- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 50°11'43"N 4°58'11"W
- Eastings/Northings: 188132, 37055
- OS Grid: SW881370
- Mapcode Local: GBR ZL.0ZQ2
- Mapcode Global: FRA 08GH.ZLC
Location and coordinates are for the approximate centre of Trewithian within this administrative area.
Geographic features and populated places may cross administrative borders.