Home Postcode finder QLD Gunnewin Gunnewin postcode QLD Gunnewin is a locality in Queensland covered by postcode 4455. Postcode 4455 State or territory Queensland (QLD) Region Toowoomba Region Add a free Gunnewin business listing Be the first listing in Gunnewin Common questionsWhat is the postcode for Gunnewin?Gunnewin, QLD has the postcode 4455.What state is Gunnewin in?Gunnewin 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 Gunnewin. Browse other postcodes in Queensland, or widen the search to every Australian postcode.