Llandecwyn is a village in Gwynedd, Wales.
It is situated within the LL47 postcode district, which is within the Talsarnau post town.
LL47 is the only postcode district within the Talsarnau post town.
The Talsarnau post town is within the Llandudno postcode area.
Administrative Ward: Harlech
Administrative District: Gwynedd
Country: Wales
UK Parliament: Dwyfor Meirionnydd