- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 51°47'31"N 3°25'55"W
- Eastings/Northings: 301329, 211363
- OS Grid: SO013113
- Mapcode Local: GBR YM.Y9BC
- Mapcode Global: VH6CQ.G6GY
Location and coordinates are for the approximate centre of Llwyn-onn within this administrative area.
Geographic features and populated places may cross administrative borders.