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