Home Postcodes by state VIC 3918 Postcode 3918 3918 is the postcode for Bittern, VIC. Localities with postcode 3918BitternVIC Postcode 3918 State or territory Victoria (VIC) Localities 1 Council area Mornington Peninsula Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3916 · Postcode 3919