Home Postcode finder QLD Upper Dawson Upper Dawson postcode QLD Upper Dawson is a locality in Queensland covered by postcode 4454. Postcode 4454 State or territory Queensland (QLD) Region Toowoomba Region Add a free Upper Dawson business listing Be the first listing in Upper Dawson Common questionsWhat is the postcode for Upper Dawson?Upper Dawson, QLD has the postcode 4454.What state is Upper Dawson in?Upper Dawson is in Queensland (QLD).Does postcode 4454 cover more than one suburb?Yes. Postcode 4454 covers 11 localities, so the postcode alone does not identify Upper Dawson. Browse other postcodes in Queensland, or widen the search to every Australian postcode.