Home Postcode finder SA Caltowie Caltowie postcode SA Caltowie is a locality in South Australia covered by postcode 5490. Postcode 5490 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Caltowie business listing Be the first listing in Caltowie Common questionsWhat is the postcode for Caltowie?Caltowie, SA has the postcode 5490.What state is Caltowie in?Caltowie is in South Australia (SA).Does postcode 5490 cover more than one suburb?Yes. Postcode 5490 covers 3 localities, so the postcode alone does not identify Caltowie. Browse other postcodes in South Australia, or widen the search to every Australian postcode.