Home Postcode finder VIC Bass Bass postcode VIC Bass is a locality in Victoria covered by postcode 3991. Postcode 3991 State or territory Victoria (VIC) Region Vic Far Country Add a free Bass business listing Be the first listing in Bass Common questionsWhat is the postcode for Bass?Bass, VIC has the postcode 3991.What state is Bass in?Bass is in Victoria (VIC).Does postcode 3991 cover more than one suburb?No. Postcode 3991 covers Bass only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Victoria, or widen the search to every Australian postcode.