Home Postcode finder VIC Casterton Casterton postcode VIC Casterton is a locality in Victoria covered by postcode 3311. Postcode 3311 State or territory Victoria (VIC) Region Vic Far Country Add a free Casterton business listing More business listings in Casterton Businesses in CastertonCasterton Primary SchoolMcPherson St · 03 55811522Casterton Secondary College27-29 Mount Gambier Rd · 03 55811588Sacred Heart School39 Robertson St · 03 55811131 Common questionsWhat is the postcode for Casterton?Casterton, VIC has the postcode 3311.What state is Casterton in?Casterton is in Victoria (VIC).Does postcode 3311 cover more than one suburb?Yes. Postcode 3311 covers 2 localities, so the postcode alone does not identify Casterton. Browse other postcodes in Victoria, or widen the search to every Australian postcode.