Home Postcode finder SA Cummins Cummins postcode SA Cummins is a locality in South Australia covered by postcode 5631. Postcode 5631 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Cummins business listing More business listings in Cummins Businesses in CumminsCummins Area SchoolMcFarlane St · 08 86762388EP Analysis26 Railway Tce · 0428762972 Common questionsWhat is the postcode for Cummins?Cummins, SA has the postcode 5631.What state is Cummins in?Cummins is in South Australia (SA).Does postcode 5631 cover more than one suburb?Yes. Postcode 5631 covers 2 localities, so the postcode alone does not identify Cummins. Browse other postcodes in South Australia, or widen the search to every Australian postcode.