Home Postcode finder VIC Great Southern Great Southern postcode VIC Great Southern is a locality in Victoria covered by postcode 3685. Postcode 3685 State or territory Victoria (VIC) Region Vic Far Country Add a free Great Southern business listing Be the first listing in Great Southern Common questionsWhat is the postcode for Great Southern?Great Southern, VIC has the postcode 3685.What state is Great Southern in?Great Southern is in Victoria (VIC).Does postcode 3685 cover more than one suburb?Yes. Postcode 3685 covers 9 localities, so the postcode alone does not identify Great Southern. Browse other postcodes in Victoria, or widen the search to every Australian postcode.