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