Llanddew is a village in Powys, Wales.
It is situated within the LD3 postcode district, which is within the Brecon post town.
LD3 is the only postcode district within the Brecon post town.
The Brecon post town is within the Llandrindod Wells postcode area.
Administrative Ward: Felin-fƒch
Administrative District: Powys
Country: Wales
UK Parliament: Brecon and Radnorshire