Home Postcode finder VIC Jack River Jack River postcode VIC Jack River is a locality in Victoria covered by postcode 3971. Postcode 3971 State or territory Victoria (VIC) Region Vic Far Country Add a free Jack River business listing Be the first listing in Jack River Common questionsWhat is the postcode for Jack River?Jack River, VIC has the postcode 3971.What state is Jack River in?Jack River is in Victoria (VIC).Does postcode 3971 cover more than one suburb?Yes. Postcode 3971 covers 21 localities, so the postcode alone does not identify Jack River. Browse other postcodes in Victoria, or widen the search to every Australian postcode.