Home Postcode finder WA Quinninup Quinninup postcode WA Quinninup 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 Quinninup business listing Be the first listing in Quinninup Common questionsWhat is the postcode for Quinninup?Quinninup, WA has the postcode 6258.What state is Quinninup in?Quinninup 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 Quinninup. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.