Home Postcodes by state VIC 3156 Postcode 3156 3156 is the postcode for 5 localities in VIC: Ferntree Gully, Lysterfield, Lysterfield South, Mountain Gate and Upper Ferntree Gully. Localities with postcode 3156Ferntree GullyVICLysterfieldVICLysterfield SouthVICMountain GateVICUpper Ferntree GullyVIC Postcode 3156 State or territory Victoria (VIC) Localities 5 Council area Knox; Casey; Mainly Knox, partly Yarra Ranges Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3155 · Postcode 3158