Home Postcode finder VIC Castlemaine Castlemaine postcode VIC Castlemaine is a locality in Victoria covered by postcode 3450. Postcode 3450 State or territory Victoria (VIC) Region Vic Far Country Add a free Castlemaine business listing More business listings in Castlemaine Businesses in CastlemaineArt Supplies Castlemaine209 Barker Street, Castlemaine Victoria 3450, Australia · +61 3 5470 5291Castlemaine North Primary SchoolBarker St · 03 54721391Castlemaine Primary SchoolCnr Mostyn & Urquhart Sts · 03 54721452 Common questionsWhat is the postcode for Castlemaine?Castlemaine, VIC has the postcode 3450.What state is Castlemaine in?Castlemaine is in Victoria (VIC).Does postcode 3450 cover more than one suburb?Yes. Postcode 3450 covers 2 localities, so the postcode alone does not identify Castlemaine. Browse other postcodes in Victoria, or widen the search to every Australian postcode.