Home Postcode finder WA Big Grove Big Grove postcode WA Big Grove is a locality in Western Australia covered by postcode 6330. Postcode 6330 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Big Grove business listing Be the first listing in Big Grove Common questionsWhat is the postcode for Big Grove?Big Grove, WA has the postcode 6330.What state is Big Grove in?Big Grove is in Western Australia (WA).Does postcode 6330 cover more than one suburb?Yes. Postcode 6330 covers 50 localities, so the postcode alone does not identify Big Grove. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.