Tresaith is a village in Ceredigion, Wales.
It is situated within the SA43 postcode district, which is within the Cardigan post town.
SA43 is the only postcode district within the Cardigan post town.
The Cardigan post town is within the Swansea postcode area.
Administrative Ward: Penbryn
Administrative District: Ceredigion
Country: Wales
UK Parliament: Ceredigion