Home Postcode finder SA Innamincka Innamincka postcode SA Innamincka is a locality in South Australia covered by postcode 5731. Postcode 5731 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Innamincka business listing Be the first listing in Innamincka Common questionsWhat is the postcode for Innamincka?Innamincka, SA has the postcode 5731.What state is Innamincka in?Innamincka is in South Australia (SA).Does postcode 5731 cover more than one suburb?Yes. Postcode 5731 covers 9 localities, so the postcode alone does not identify Innamincka. Browse other postcodes in South Australia, or widen the search to every Australian postcode.