Home Postcode finder SA Hindmarsh Island Hindmarsh Island postcode SA Hindmarsh Island is a locality in South Australia covered by postcode 5214. Postcode 5214 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Hindmarsh Island business listing Be the first listing in Hindmarsh Island Common questionsWhat is the postcode for Hindmarsh Island?Hindmarsh Island, SA has the postcode 5214.What state is Hindmarsh Island in?Hindmarsh Island is in South Australia (SA).Does postcode 5214 cover more than one suburb?Yes. Postcode 5214 covers 8 localities, so the postcode alone does not identify Hindmarsh Island. Browse other postcodes in South Australia, or widen the search to every Australian postcode.