Home Postcode finder QLD Jackson Jackson postcode QLD Jackson is a locality in Queensland covered by postcode 4426. Postcode 4426 State or territory Queensland (QLD) Region Toowoomba Region Add a free Jackson business listing Be the first listing in Jackson Common questionsWhat is the postcode for Jackson?Jackson, QLD has the postcode 4426.What state is Jackson in?Jackson 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. Browse other postcodes in Queensland, or widen the search to every Australian postcode.