Home Postcode finder QLD Spring Mountain Spring Mountain postcode QLD Spring Mountain is a locality in Queensland covered by postcode 4124. Postcode 4124 State or territory Queensland (QLD) Region Heathwood Add a free Spring Mountain business listing Be the first listing in Spring Mountain Common questionsWhat is the postcode for Spring Mountain?Spring Mountain, QLD has the postcode 4124.What state is Spring Mountain in?Spring Mountain is in Queensland (QLD).Does postcode 4124 cover more than one suburb?Yes. Postcode 4124 covers 5 localities, so the postcode alone does not identify Spring Mountain. Browse other postcodes in Queensland, or widen the search to every Australian postcode.