Home Postcode finder QLD Mount Forbes Mount Forbes postcode QLD Mount Forbes is a locality in Queensland covered by postcode 4340. Postcode 4340 State or territory Queensland (QLD) Region Western Suburbs Add a free Mount Forbes business listing Be the first listing in Mount Forbes Common questionsWhat is the postcode for Mount Forbes?Mount Forbes, QLD has the postcode 4340.What state is Mount Forbes in?Mount Forbes is in Queensland (QLD).Does postcode 4340 cover more than one suburb?Yes. Postcode 4340 covers 18 localities, so the postcode alone does not identify Mount Forbes. Browse other postcodes in Queensland, or widen the search to every Australian postcode.