Llanishen is a village in Monmouthshire, Wales.
It is situated within the NP16 postcode district, which is within the Chepstow post town.
NP16 is the only postcode district within the Chepstow post town.
The Chepstow post town is within the Newport postcode area.
Administrative Ward: Trellech United
Administrative District: Monmouthshire
Country: Wales
UK Parliament: Monmouth