Home Postcodes by state VIC 3857 Postcode 3857 3857 is the postcode for Cowwarr, VIC. Localities with postcode 3857CowwarrVIC Postcode 3857 State or territory Victoria (VIC) Localities 1 Council area Mainly Wellington, partly Latrobe Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3856 · Postcode 3858