Home Postcode finder SA Julia Julia postcode SA Julia is a locality in South Australia covered by postcode 5374. Postcode 5374 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Julia business listing Be the first listing in Julia Common questionsWhat is the postcode for Julia?Julia, SA has the postcode 5374.What state is Julia in?Julia is in South Australia (SA).Does postcode 5374 cover more than one suburb?Yes. Postcode 5374 covers 15 localities, so the postcode alone does not identify Julia. Browse other postcodes in South Australia, or widen the search to every Australian postcode.