Home Postcode finder SA Pinkerton Plains Pinkerton Plains postcode SA Pinkerton Plains is a locality in South Australia covered by postcode 5400. Postcode 5400 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Pinkerton Plains business listing Be the first listing in Pinkerton Plains Common questionsWhat is the postcode for Pinkerton Plains?Pinkerton Plains, SA has the postcode 5400.What state is Pinkerton Plains in?Pinkerton Plains is in South Australia (SA).Does postcode 5400 cover more than one suburb?Yes. Postcode 5400 covers 4 localities, so the postcode alone does not identify Pinkerton Plains. Browse other postcodes in South Australia, or widen the search to every Australian postcode.