Llanllwch is a village in Carmarthenshire, Wales.
It is situated within the SA31 postcode district, which is within the Carmarthen post town.
The full list of postcode districts within the Carmarthen post town is as follows:
The Carmarthen post town is within the Swansea postcode area.
Administrative Ward: Carmarthen Town West
Administrative District: Carmarthenshire
Country: Wales
UK Parliament: Carmarthen West and South Pembrokeshire