Home Postcodes by state VIC 3958 Postcode 3958 3958 is the postcode for Buffalo, VIC. Localities with postcode 3958BuffaloVIC Postcode 3958 State or territory Victoria (VIC) Localities 1 Council area South Gippsland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3957 · Postcode 3959