Home Postcode finder VIC St Arnaud St Arnaud postcode VIC St Arnaud is a locality in Victoria covered by postcode 3478. Postcode 3478 State or territory Victoria (VIC) Region Vic Far Country Add a free St Arnaud business listing More business listings in St Arnaud Businesses in St ArnaudSt Arnaud Primary SchoolCharlton Rd · 03 54951028St Arnaud Secondary CollegeSmith St · 03 54951811St Patrick's School5 Wattle St · 03 54951038 Common questionsWhat is the postcode for St Arnaud?St Arnaud, VIC has the postcode 3478.What state is St Arnaud in?St Arnaud is in Victoria (VIC).Does postcode 3478 cover more than one suburb?Yes. Postcode 3478 covers 8 localities, so the postcode alone does not identify St Arnaud. Browse other postcodes in Victoria, or widen the search to every Australian postcode.