Home Postcode finder QLD Barker Creek Flat Barker Creek Flat postcode QLD Barker Creek Flat is a locality in Queensland covered by postcode 4615. Postcode 4615 State or territory Queensland (QLD) Region Toowoomba Region Add a free Barker Creek Flat business listing Be the first listing in Barker Creek Flat Common questionsWhat is the postcode for Barker Creek Flat?Barker Creek Flat, QLD has the postcode 4615.What state is Barker Creek Flat in?Barker Creek Flat is in Queensland (QLD).Does postcode 4615 cover more than one suburb?Yes. Postcode 4615 covers 19 localities, so the postcode alone does not identify Barker Creek Flat. Browse other postcodes in Queensland, or widen the search to every Australian postcode.