Home Postcode finder SA Nadia Nadia postcode SA Nadia 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 Nadia business listing Be the first listing in Nadia Common questionsWhat is the postcode for Nadia?Nadia, SA has the postcode 5690.What state is Nadia in?Nadia 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 Nadia. Browse other postcodes in South Australia, or widen the search to every Australian postcode.