Castellan is a village in Pembrokeshire, Wales.
It is situated within the SA37 postcode district, which is within the Boncath post town.
SA37 is the only postcode district within the Boncath post town.
The Boncath post town is within the Swansea postcode area.
Administrative Ward: Clydau
Administrative District: Pembrokeshire
Country: Wales
UK Parliament: Preseli Pembrokeshire