Home Postcode finder QLD Grays Gate Grays Gate postcode QLD Grays Gate is a locality in Queensland covered by postcode 4357. Postcode 4357 State or territory Queensland (QLD) Region Toowoomba Region Add a free Grays Gate business listing Be the first listing in Grays Gate Common questionsWhat is the postcode for Grays Gate?Grays Gate, QLD has the postcode 4357.What state is Grays Gate in?Grays Gate is in Queensland (QLD).Does postcode 4357 cover more than one suburb?Yes. Postcode 4357 covers 26 localities, so the postcode alone does not identify Grays Gate. Browse other postcodes in Queensland, or widen the search to every Australian postcode.