Home Postcode finder VIC Cosgrove South Cosgrove South postcode VIC Cosgrove South is a locality in Victoria covered by postcode 3631. Postcode 3631 State or territory Victoria (VIC) Region Vic Far Country Add a free Cosgrove South business listing Be the first listing in Cosgrove South Common questionsWhat is the postcode for Cosgrove South?Cosgrove South, VIC has the postcode 3631.What state is Cosgrove South in?Cosgrove South is in Victoria (VIC).Does postcode 3631 cover more than one suburb?Yes. Postcode 3631 covers 14 localities, so the postcode alone does not identify Cosgrove South. Browse other postcodes in Victoria, or widen the search to every Australian postcode.