Home Postcode finder WA Karlgarin Karlgarin postcode WA Karlgarin is a locality in Western Australia covered by postcode 6358. Postcode 6358 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Karlgarin business listing Be the first listing in Karlgarin Common questionsWhat is the postcode for Karlgarin?Karlgarin, WA has the postcode 6358.What state is Karlgarin in?Karlgarin is in Western Australia (WA).Does postcode 6358 cover more than one suburb?No. Postcode 6358 covers Karlgarin only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.