Home Postcode finder SA Sunnyvale Sunnyvale postcode SA Sunnyvale is a locality in South Australia covered by postcode 5552. Postcode 5552 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Sunnyvale business listing Be the first listing in Sunnyvale Common questionsWhat is the postcode for Sunnyvale?Sunnyvale, SA has the postcode 5552.What state is Sunnyvale in?Sunnyvale is in South Australia (SA).Does postcode 5552 cover more than one suburb?Yes. Postcode 5552 covers 4 localities, so the postcode alone does not identify Sunnyvale. Browse other postcodes in South Australia, or widen the search to every Australian postcode.