- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 52°3'38"N 4°15'53"W
- Eastings/Northings: 244823, 242663
- OS Grid: SN448426
- Mapcode Local: GBR DJ.D6RV
- Mapcode Global: VH3KK.1G4P
Location and coordinates are for the approximate centre of Derlwyn within this administrative area.
Geographic features and populated places may cross administrative borders.