Home Postcode finder QLD Proston Proston postcode QLD Proston is a locality in Queensland covered by postcode 4613. Postcode 4613 State or territory Queensland (QLD) Region Toowoomba Region Add a free Proston business listing More business listings in Proston Businesses in ProstonProston State School1 Rodney St · 07 41694333 Common questionsWhat is the postcode for Proston?Proston, QLD has the postcode 4613.What state is Proston in?Proston is in Queensland (QLD).Does postcode 4613 cover more than one suburb?Yes. Postcode 4613 covers 10 localities, so the postcode alone does not identify Proston. Browse other postcodes in Queensland, or widen the search to every Australian postcode.