The postal-codes of Seion is LL55. The City of Seion is in Gwynedd. The country of Gwynedd is Wales (WLS)
The seion postcode region (AB) contains 34 unique 'outward' codes. seion is the main postal town or district for this region, with all seion postcodes starting with the following outward codes.
This page contains a list of postcodes for seion area. Select a seion postcode to see the map location, demographics, house prices, local information, tourist guides and statistics:
There are a number of local information, guides and useful data to browse and explore, whether you're a seion resident or a visitor to the seion area.