KML is from Wikidata The WA postcode area, also known as the Warrington postcode area, is a group of sixteen postcode districts in North West England, within nine post towns. These cover north Cheshire (including Warrington, Frodsham, Knutsford, Lymm, Runcorn and Widnes), eastern Merseyside (including St Helens and Newton-le-Willows) and small parts of Greater Manchester (including Altrincham).