Home Postcode finder VIC Richmond South Richmond South postcode VIC Richmond South is a locality in Victoria covered by postcode 3121. Postcode 3121 State or territory Victoria (VIC) Region Moorabbin Add a free Richmond South business listing Be the first listing in Richmond South Common questionsWhat is the postcode for Richmond South?Richmond South, VIC has the postcode 3121.What state is Richmond South in?Richmond South is in Victoria (VIC).Does postcode 3121 cover more than one suburb?Yes. Postcode 3121 covers 7 localities, so the postcode alone does not identify Richmond South. Browse other postcodes in Victoria, or widen the search to every Australian postcode.