Home Postcode finder QLD Opalton Opalton postcode QLD Opalton is a locality in Queensland covered by postcode 4735. Postcode 4735 State or territory Queensland (QLD) Region Central QLD Add a free Opalton business listing Be the first listing in Opalton Common questionsWhat is the postcode for Opalton?Opalton, QLD has the postcode 4735.What state is Opalton in?Opalton is in Queensland (QLD).Does postcode 4735 cover more than one suburb?Yes. Postcode 4735 covers 4 localities, so the postcode alone does not identify Opalton. Browse other postcodes in Queensland, or widen the search to every Australian postcode.