Alltwen is a village in Neath Port Talbot, Wales.
It is situated within the SA8 postcode district, which is within the Swansea post town.
The full list of postcode districts within the Swansea post town is as follows:
The Swansea post town is within the Swansea postcode area.
Administrative Ward: Allt-wen
Administrative District: Neath Port Talbot
Country: Wales
UK Parliament: Neath