Home Postcodes by state VIC 3954 Postcode 3954 3954 is the postcode for Koonwarra, VIC. Localities with postcode 3954KoonwarraVIC Postcode 3954 State or territory Victoria (VIC) Localities 1 Council area South Gippsland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3953 · Postcode 3956