Home Postcode finder SA Blackford Blackford postcode SA Blackford is a locality in South Australia covered by postcode 5275. Postcode 5275 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Blackford business listing Be the first listing in Blackford Common questionsWhat is the postcode for Blackford?Blackford, SA has the postcode 5275.What state is Blackford in?Blackford is in South Australia (SA).Does postcode 5275 cover more than one suburb?Yes. Postcode 5275 covers 15 localities, so the postcode alone does not identify Blackford. Browse other postcodes in South Australia, or widen the search to every Australian postcode.