Home Postcode finder QLD Whiteside Whiteside postcode QLD Whiteside is a locality in Queensland covered by postcode 4503. Postcode 4503 State or territory Queensland (QLD) Region Moreton Add a free Whiteside business listing Be the first listing in Whiteside Common questionsWhat is the postcode for Whiteside?Whiteside, QLD has the postcode 4503.What state is Whiteside in?Whiteside is in Queensland (QLD).Does postcode 4503 cover more than one suburb?Yes. Postcode 4503 covers 6 localities, so the postcode alone does not identify Whiteside. Browse other postcodes in Queensland, or widen the search to every Australian postcode.