Home Postcode finder QLD Mount Byron Mount Byron postcode QLD Mount Byron is a locality in Queensland covered by postcode 4312. Postcode 4312 State or territory Queensland (QLD) Region Western Suburbs Add a free Mount Byron business listing Be the first listing in Mount Byron Common questionsWhat is the postcode for Mount Byron?Mount Byron, QLD has the postcode 4312.What state is Mount Byron in?Mount Byron is in Queensland (QLD).Does postcode 4312 cover more than one suburb?Yes. Postcode 4312 covers 13 localities, so the postcode alone does not identify Mount Byron. Browse other postcodes in Queensland, or widen the search to every Australian postcode.