Home Postcode finder SA Harriet River Harriet River postcode SA Harriet River is a locality in South Australia covered by postcode 5223. Postcode 5223 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Harriet River business listing Be the first listing in Harriet River Common questionsWhat is the postcode for Harriet River?Harriet River, SA has the postcode 5223.What state is Harriet River in?Harriet River is in South Australia (SA).Does postcode 5223 cover more than one suburb?Yes. Postcode 5223 covers 30 localities, so the postcode alone does not identify Harriet River. Browse other postcodes in South Australia, or widen the search to every Australian postcode.