Home Postcodes by state VIC 3131 Postcode 3131 3131 is the postcode for 3 localities in VIC: Forest Hill, Nunawading and Brentford Square. Localities with postcode 3131Brentford SquareVICForest HillVICNunawadingVIC Postcode 3131 State or territory Victoria (VIC) Localities 3 Council area Whitehorse Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3130 · Postcode 3132