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