Home Postcode finder SA Erskine Erskine postcode SA Erskine is a locality in South Australia covered by postcode 5422. Postcode 5422 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Erskine business listing Be the first listing in Erskine Common questionsWhat is the postcode for Erskine?Erskine, SA has the postcode 5422.What state is Erskine in?Erskine is in South Australia (SA).Does postcode 5422 cover more than one suburb?Yes. Postcode 5422 covers 13 localities, so the postcode alone does not identify Erskine. Browse other postcodes in South Australia, or widen the search to every Australian postcode.