- Category: Populated Place
- Type: Other Settlement
- Latitude/Longitude: 50°36'3"N 4°44'8"W
- Eastings/Northings: 206500, 81500
- OS Grid: SX065815
- Mapcode Local: GBR N2.CFCH
- Mapcode Global: FRA 07ZH.0VC
Location and coordinates are for the approximate centre of Trewennan within this administrative area.
Geographic features and populated places may cross administrative borders.