WA55 Warrington Postcode district WA55: 2 named streets and 8 live postcodes, in Warrington. Streets Europa Boulevard, Warrington Milner Street, Warrington Postcodes WA55 1AQ WA55 1DU WA55 1EL WA55 1GG WA55 1LR WA55 1SE WA55 1WS WA55 1YY Source: ONS Postcode Directory (live postcodes only) and OS Open Linked Identifiers for the streets.