Home Postcode finder QLD Jackson South Jackson South postcode QLD Jackson South is a locality in Queensland covered by postcode 4426. Postcode 4426 State or territory Queensland (QLD) Region Toowoomba Region Add a free Jackson South business listing Be the first listing in Jackson South Common questionsWhat is the postcode for Jackson South?Jackson South, QLD has the postcode 4426.What state is Jackson South in?Jackson South is in Queensland (QLD).Does postcode 4426 cover more than one suburb?Yes. Postcode 4426 covers 3 localities, so the postcode alone does not identify Jackson South. Browse other postcodes in Queensland, or widen the search to every Australian postcode.