Home Postcode finder VIC Grand Ridge Grand Ridge postcode VIC Grand Ridge is a locality in Victoria covered by postcode 3870. Postcode 3870 State or territory Victoria (VIC) Region Vic Far Country Add a free Grand Ridge business listing Be the first listing in Grand Ridge Common questionsWhat is the postcode for Grand Ridge?Grand Ridge, VIC has the postcode 3870.What state is Grand Ridge in?Grand Ridge is in Victoria (VIC).Does postcode 3870 cover more than one suburb?Yes. Postcode 3870 covers 5 localities, so the postcode alone does not identify Grand Ridge. Browse other postcodes in Victoria, or widen the search to every Australian postcode.