Home Postcodes by state VIC 3812 Postcode 3812 3812 is the postcode for 3 localities in VIC: Maryknoll, Nar Nar Goon and Nar Nar Goon North. Localities with postcode 3812MaryknollVICNar Nar GoonVICNar Nar Goon NorthVIC Postcode 3812 State or territory Victoria (VIC) Localities 3 Council area Cardinia Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3810 · Postcode 3813