Home Postcode finder SA Sunnyside Sunnyside postcode SA Sunnyside is a locality in South Australia covered by postcode 5253. Postcode 5253 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Sunnyside business listing Be the first listing in Sunnyside Common questionsWhat is the postcode for Sunnyside?Sunnyside, SA has the postcode 5253.What state is Sunnyside in?Sunnyside is in South Australia (SA).Does postcode 5253 cover more than one suburb?Yes. Postcode 5253 covers 25 localities, so the postcode alone does not identify Sunnyside. Browse other postcodes in South Australia, or widen the search to every Australian postcode.