- Category: Populated Place
- Type: Village
- Latitude/Longitude: 53°16'8"N 3°32'25"W
- Eastings/Northings: 297368, 375786
- OS Grid: SH973757
- Mapcode Local: GBR 3ZQM.BT
- Mapcode Global: WH65G.L3B5
Location and coordinates are for the approximate centre of Llansan Sior within this administrative area.
Geographic features and populated places may cross administrative borders.