Home Postcode finder WA Upper Warren Upper Warren postcode WA Upper Warren is a locality in Western Australia covered by postcode 6258. Postcode 6258 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Upper Warren business listing Be the first listing in Upper Warren Common questionsWhat is the postcode for Upper Warren?Upper Warren, WA has the postcode 6258.What state is Upper Warren in?Upper Warren is in Western Australia (WA).Does postcode 6258 cover more than one suburb?Yes. Postcode 6258 covers 22 localities, so the postcode alone does not identify Upper Warren. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.