- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 52°51'1"N 4°41'20"W
- Eastings/Northings: 219024, 331495
- OS Grid: SH190314
- Mapcode Local: GBR GPS5.4W9
- Mapcode Global: WH33F.YM83
Location and coordinates are for the approximate centre of Trefgraig within this administrative area.
Geographic features and populated places may cross administrative borders.