Home Postcode finder SA Penong Penong postcode SA Penong 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 Penong business listing More business listings in Penong Businesses in PenongPenong Primary School08 86251017 Common questionsWhat is the postcode for Penong?Penong, SA has the postcode 5690.What state is Penong in?Penong 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 Penong. Browse other postcodes in South Australia, or widen the search to every Australian postcode.