Home Postcodes by state VIC 3856 Postcode 3856 3856 is the postcode for Toongabbie, VIC. Localities with postcode 3856ToongabbieVIC Postcode 3856 State or territory Victoria (VIC) Localities 1 Council area Latrobe Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3854 · Postcode 3857