Home Postcodes by state VIC 3978 Postcode 3978 3978 is the postcode for 3 localities in VIC: Cardinia, Clyde and Clyde North. Localities with postcode 3978CardiniaVICClydeVICClyde NorthVIC Postcode 3978 State or territory Victoria (VIC) Localities 3 Council area Cardinia; Casey Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 3977 · Postcode 3979