Mostyn is a village in Flintshire, Wales.
It is situated within the CH8 postcode district, which is within the Holywell post town.
CH8 is the only postcode district within the Holywell post town.
The Holywell post town is within the Chester postcode area.
Administrative Ward: Mostyn
Administrative District: Flintshire
Country: Wales
UK Parliament: Delyn