Home Postcode finder SA Calca Calca postcode SA Calca is a locality in South Australia covered by postcode 5671. Postcode 5671 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Calca business listing Be the first listing in Calca Common questionsWhat is the postcode for Calca?Calca, SA has the postcode 5671.What state is Calca in?Calca is in South Australia (SA).Does postcode 5671 cover more than one suburb?Yes. Postcode 5671 covers 8 localities, so the postcode alone does not identify Calca. Browse other postcodes in South Australia, or widen the search to every Australian postcode.