Home Postcode finder VIC Cathcart Cathcart postcode VIC Cathcart is a locality in Victoria covered by postcode 3377. Postcode 3377 State or territory Victoria (VIC) Region Vic Far Country Add a free Cathcart business listing Be the first listing in Cathcart Common questionsWhat is the postcode for Cathcart?Cathcart, VIC has the postcode 3377.What state is Cathcart in?Cathcart is in Victoria (VIC).Does postcode 3377 cover more than one suburb?Yes. Postcode 3377 covers 20 localities, so the postcode alone does not identify Cathcart. Browse other postcodes in Victoria, or widen the search to every Australian postcode.