- Category: Populated Place
- Type: Village
- Latitude/Longitude: 50°16'36"N 4°59'50"W
- Eastings/Northings: 186525, 46180
- OS Grid: SW865461
- Mapcode Local: GBR ZJ.JQGQ
- Mapcode Global: FRA 08F9.DWQ
Location and coordinates are for the approximate centre of Tresillian within this administrative area.
Geographic features and populated places may cross administrative borders.