Home Postcode finder QLD Southtown Southtown postcode QLD Southtown is a locality in Queensland covered by postcode 4350. Postcode 4350 State or territory Queensland (QLD) Region Toowoomba Region Add a free Southtown business listing Be the first listing in Southtown Common questionsWhat is the postcode for Southtown?Southtown, QLD has the postcode 4350.What state is Southtown in?Southtown is in Queensland (QLD).Does postcode 4350 cover more than one suburb?Yes. Postcode 4350 covers 43 localities, so the postcode alone does not identify Southtown. Browse other postcodes in Queensland, or widen the search to every Australian postcode.