Home Postcode finder SA Pekina Pekina postcode SA Pekina is a locality in South Australia covered by postcode 5431. Postcode 5431 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Pekina business listing Be the first listing in Pekina Common questionsWhat is the postcode for Pekina?Pekina, SA has the postcode 5431.What state is Pekina in?Pekina is in South Australia (SA).Does postcode 5431 cover more than one suburb?Yes. Postcode 5431 covers 14 localities, so the postcode alone does not identify Pekina. Browse other postcodes in South Australia, or widen the search to every Australian postcode.