Home Postcodes by state VIC 3138 Postcode 3138 3138 is the postcode for Mooroolbark, VIC. Localities with postcode 3138MooroolbarkVIC Postcode 3138 State or territory Victoria (VIC) Localities 1 Council area Yarra Ranges Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3137 · Postcode 3139