Home Postcodes by state VIC 3803 Postcode 3803 3803 is the postcode for Hallam, VIC. Localities with postcode 3803HallamVIC Postcode 3803 State or territory Victoria (VIC) Localities 1 Council area Casey Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3802 · Postcode 3804