Home Postcode finder SA Senior Senior postcode SA Senior is a locality in South Australia covered by postcode 5268. Postcode 5268 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Senior business listing Be the first listing in Senior Common questionsWhat is the postcode for Senior?Senior, SA has the postcode 5268.What state is Senior in?Senior is in South Australia (SA).Does postcode 5268 cover more than one suburb?Yes. Postcode 5268 covers 8 localities, so the postcode alone does not identify Senior. Browse other postcodes in South Australia, or widen the search to every Australian postcode.