Home Postcode finder WA College Grove College Grove postcode WA College Grove is a locality in Western Australia covered by postcode 6230. Postcode 6230 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free College Grove business listing Be the first listing in College Grove Common questionsWhat is the postcode for College Grove?College Grove, WA has the postcode 6230.What state is College Grove in?College Grove is in Western Australia (WA).Does postcode 6230 cover more than one suburb?Yes. Postcode 6230 covers 13 localities, so the postcode alone does not identify College Grove. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.