Home Postcode finder QLD Wycombe Wycombe postcode QLD Wycombe is a locality in Queensland covered by postcode 4455. Postcode 4455 State or territory Queensland (QLD) Region Toowoomba Region Add a free Wycombe business listing Be the first listing in Wycombe Common questionsWhat is the postcode for Wycombe?Wycombe, QLD has the postcode 4455.What state is Wycombe in?Wycombe is in Queensland (QLD).Does postcode 4455 cover more than one suburb?Yes. Postcode 4455 covers 19 localities, so the postcode alone does not identify Wycombe. Browse other postcodes in Queensland, or widen the search to every Australian postcode.