Cefn Mawr is a village in Wrexham county borough, Wales.
It is situated within the LL14 postcode district, which is within the Wrexham post town.
The full list of postcode districts within the Wrexham post town is as follows:
The Wrexham post town is within the Llandudno postcode area.
Administrative Ward: Cefn
Administrative District: Wrexham
Country: Wales
UK Parliament: Clwyd South