Pentwyn Deintyr is a village in Merthyr Tydfil, Wales.
It is situated within the CF45 postcode district, which is within the Mountain Ash post town.
CF45 is the only postcode district within the Mountain Ash post town.
The Mountain Ash post town is within the Cardiff postcode area.
Administrative Ward: Abercynon
Administrative District: Rhondda Cynon Taf
Country: Wales
UK Parliament: Cynon Valley