Home Postcode finder SA Proof Range Proof Range postcode SA Proof Range is a locality in South Australia covered by postcode 5550. Postcode 5550 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Proof Range business listing Be the first listing in Proof Range Common questionsWhat is the postcode for Proof Range?Proof Range, SA has the postcode 5550.What state is Proof Range in?Proof Range is in South Australia (SA).Does postcode 5550 cover more than one suburb?Yes. Postcode 5550 covers 8 localities, so the postcode alone does not identify Proof Range. Browse other postcodes in South Australia, or widen the search to every Australian postcode.