Home Postcode finder QLD North Branch North Branch postcode QLD North Branch is a locality in Queensland covered by postcode 4370. Postcode 4370 State or territory Queensland (QLD) Region Toowoomba Region Add a free North Branch business listing Be the first listing in North Branch Common questionsWhat is the postcode for North Branch?North Branch, QLD has the postcode 4370.What state is North Branch in?North Branch 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 North Branch. Browse other postcodes in Queensland, or widen the search to every Australian postcode.