- Category: Populated Place
- Type: Town
- Latitude/Longitude: 52°55'35"N 4°7'50"W
- Eastings/Northings: 256859, 338689
- OS Grid: SH568386
- Mapcode Local: GBR 5P.MR1M
- Mapcode Global: WH55L.JP5V
Location and coordinates are for the approximate centre of Porthmadog within this administrative area.
Geographic features and populated places may cross administrative borders.