Cemlyn is a village in Anglesey, Wales.
It is situated within the LL67 postcode district, which is within the Cemaes Bay post town.
LL67 is the only postcode district within the Cemaes Bay post town.
The Cemaes Bay post town is within the Llandudno postcode area.
Administrative Ward: Mechell
Administrative District: Isle of Anglesey
Country: Wales
UK Parliament: Ynys Môn