Cwmdauddwr is a village in Powys, Wales.
It is situated within the LD6 postcode district, which is within the Rhayader post town.
LD6 is the only postcode district within the Rhayader post town.
The Rhayader post town is within the Llandrindod Wells postcode area.
Administrative Ward: Rhayader
Administrative District: Powys
Country: Wales
UK Parliament: Brecon and Radnorshire