Thornhill is a village in Torfaen, Wales.
It is situated within the NP44 postcode district, which is within the Cwmbran post town.
NP44 is the only postcode district within the Cwmbran post town.
The Cwmbran post town is within the Newport postcode area.
Administrative Ward: Upper Cwmbran
Administrative District: Torfaen
Country: Wales
UK Parliament: Torfaen