Home Postcodes by state VIC 3975 Postcode 3975 3975 is the postcode for 2 localities in VIC: Lynbrook and Lyndhurst. Localities with postcode 3975LynbrookVICLyndhurstVIC Postcode 3975 State or territory Victoria (VIC) Localities 2 Council area Casey Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3971 · Postcode 3976