CH27 Wallasey Postcode district CH27: 2 named streets and 21 live postcodes, in Wirral. Streets Brighton Street, Wallasey Seaview Road, Wallasey Postcodes CH27 9BT CH27 9BX CH27 9DT CH27 9DY CH27 9DZ CH27 9EJ CH27 9FN CH27 9FP CH27 9FQ CH27 9FZ CH27 9GJ CH27 9GR CH27 9GW CH27 9GX CH27 9SA CH27 9SB CH27 9ZU CH27 9ZW CH27 9ZX CH27 9ZY CH27 9ZZ Source: ONS Postcode Directory (live postcodes only) and OS Open Linked Identifiers for the streets.