Home Postcode finder QLD Swan Creek Swan Creek postcode QLD Swan Creek is a locality in Queensland covered by postcode 4370. Postcode 4370 State or territory Queensland (QLD) Region Toowoomba Region Add a free Swan Creek business listing Be the first listing in Swan Creek Common questionsWhat is the postcode for Swan Creek?Swan Creek, QLD has the postcode 4370.What state is Swan Creek in?Swan Creek is in Queensland (QLD).Does postcode 4370 cover more than one suburb?Yes. Postcode 4370 covers 46 localities, so the postcode alone does not identify Swan Creek. Browse other postcodes in Queensland, or widen the search to every Australian postcode.