Home Postcode finder QLD Mount Sylvia Mount Sylvia postcode QLD Mount Sylvia is a locality in Queensland covered by postcode 4343. Postcode 4343 State or territory Queensland (QLD) Region Western Suburbs Add a free Mount Sylvia business listing More business listings in Mount Sylvia Businesses in Mount SylviaMt Sylvia State SchoolLeft Hand Branch Rd · 07 54626245 Common questionsWhat is the postcode for Mount Sylvia?Mount Sylvia, QLD has the postcode 4343.What state is Mount Sylvia in?Mount Sylvia is in Queensland (QLD).Does postcode 4343 cover more than one suburb?Yes. Postcode 4343 covers 24 localities, so the postcode alone does not identify Mount Sylvia. Browse other postcodes in Queensland, or widen the search to every Australian postcode.