Home Postcodes by state VIC 3991 Postcode 3991 3991 is the postcode for Bass, VIC. Localities with postcode 3991BassVIC Postcode 3991 State or territory Victoria (VIC) Localities 1 Council area Bass Coast Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3990 · Postcode 3992