Home Postcode finder VIC Cardinia Cardinia postcode VIC Cardinia is a locality in Victoria covered by postcode 3978. Postcode 3978 State or territory Victoria (VIC) Region Frankston Add a free Cardinia business listing More business listings in Cardinia Businesses in CardiniaCardinia Primary School2405 Ballarto Rd · 03 59988323 Common questionsWhat is the postcode for Cardinia?Cardinia, VIC has the postcode 3978.What state is Cardinia in?Cardinia is in Victoria (VIC).Does postcode 3978 cover more than one suburb?Yes. Postcode 3978 covers 3 localities, so the postcode alone does not identify Cardinia. Browse other postcodes in Victoria, or widen the search to every Australian postcode.