Home Postcode finder WA Karnup Karnup postcode WA Karnup is a locality in Western Australia covered by postcode 6176. Postcode 6176 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Karnup business listing Be the first listing in Karnup Common questionsWhat is the postcode for Karnup?Karnup, WA has the postcode 6176.What state is Karnup in?Karnup is in Western Australia (WA).Does postcode 6176 cover more than one suburb?No. Postcode 6176 covers Karnup only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.