CH26 Birkenhead Postcode district CH26: 1 named streets and 6 live postcodes, in Wirral. Streets Prenton Way, Birkenhead Postcodes CH26 9ES CH26 9EZ CH26 9FL CH26 9FS CH26 9FU CH26 9FX Source: ONS Postcode Directory (live postcodes only) and OS Open Linked Identifiers for the streets.