Home Postcode finder QLD Springside Springside postcode QLD Springside is a locality in Queensland covered by postcode 4356. Postcode 4356 State or territory Queensland (QLD) Region Toowoomba Region Add a free Springside business listing Be the first listing in Springside Common questionsWhat is the postcode for Springside?Springside, QLD has the postcode 4356.What state is Springside in?Springside is in Queensland (QLD).Does postcode 4356 cover more than one suburb?Yes. Postcode 4356 covers 18 localities, so the postcode alone does not identify Springside. Browse other postcodes in Queensland, or widen the search to every Australian postcode.