Home Postcode finder VIC French Island French Island postcode VIC French Island is a locality in Victoria covered by postcode 3921. Postcode 3921 State or territory Victoria (VIC) Region Vic Far Country Add a free French Island business listing More business listings in French Island Businesses in French IslandPerseverance Primary SchoolCentreway · 03 59801292 Common questionsWhat is the postcode for French Island?French Island, VIC has the postcode 3921.What state is French Island in?French Island is in Victoria (VIC).Does postcode 3921 cover more than one suburb?No. Postcode 3921 covers French Island only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Victoria, or widen the search to every Australian postcode.