Home Postcode finder QLD Silverleigh Silverleigh postcode QLD Silverleigh is a locality in Queensland covered by postcode 4401. Postcode 4401 State or territory Queensland (QLD) Region Toowoomba Region Add a free Silverleigh business listing Be the first listing in Silverleigh Common questionsWhat is the postcode for Silverleigh?Silverleigh, QLD has the postcode 4401.What state is Silverleigh in?Silverleigh is in Queensland (QLD).Does postcode 4401 cover more than one suburb?Yes. Postcode 4401 covers 16 localities, so the postcode alone does not identify Silverleigh. Browse other postcodes in Queensland, or widen the search to every Australian postcode.