Home Postcode finder SA Ceduna Ceduna postcode SA Ceduna is a locality in South Australia covered by postcode 5690. Postcode 5690 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Ceduna business listing More business listings in Ceduna Businesses in CedunaCeduna Area SchoolMay Crescent · 08 86252030Crossways Lutheran School4 Smith Rd · 08 86252873Koonibba Aboriginal SchoolKoonibba Via · 08 86250006 Common questionsWhat is the postcode for Ceduna?Ceduna, SA has the postcode 5690.What state is Ceduna in?Ceduna is in South Australia (SA).Does postcode 5690 cover more than one suburb?Yes. Postcode 5690 covers 19 localities, so the postcode alone does not identify Ceduna. Browse other postcodes in South Australia, or widen the search to every Australian postcode.