Home Postcode finder SA Peake Peake postcode SA Peake is a locality in South Australia covered by postcode 5301. Postcode 5301 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Peake business listing Be the first listing in Peake Common questionsWhat is the postcode for Peake?Peake, SA has the postcode 5301.What state is Peake in?Peake is in South Australia (SA).Does postcode 5301 cover more than one suburb?Yes. Postcode 5301 covers 9 localities, so the postcode alone does not identify Peake. Browse other postcodes in South Australia, or widen the search to every Australian postcode.