Home Postcodes by state VIC 3018 Postcode 3018 3018 is the postcode for 2 localities in VIC: Altona and Seaholme. Localities with postcode 3018AltonaVICSeaholmeVIC Postcode 3018 State or territory Victoria (VIC) Localities 2 Council area Hobsons Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3016 · Postcode 3019