Deiniolen is a village in Gwynedd, Wales.

It is situated within the LL55 postcode district, which is within the Caernarfon post town.

The full list of postcode districts within the Caernarfon post town is as follows:

The Caernarfon post town is within the Llandudno postcode area.

Key data for Deiniolen:

Administrative Ward: Deiniolen

Administrative District: Gwynedd

Country: Wales

UK Parliament: Arfon

A map showing the location of Deiniolen within the LL55 postcode district