Home Postcode finder SA Sunnydale Sunnydale postcode SA Sunnydale is a locality in South Australia covered by postcode 5354. Postcode 5354 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Sunnydale business listing Be the first listing in Sunnydale Common questionsWhat is the postcode for Sunnydale?Sunnydale, SA has the postcode 5354.What state is Sunnydale in?Sunnydale is in South Australia (SA).Does postcode 5354 cover more than one suburb?Yes. Postcode 5354 covers 10 localities, so the postcode alone does not identify Sunnydale. Browse other postcodes in South Australia, or widen the search to every Australian postcode.