Home Postcode finder SA Amyton Amyton postcode SA Amyton 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 Amyton business listing Be the first listing in Amyton Common questionsWhat is the postcode for Amyton?Amyton, SA has the postcode 5431.What state is Amyton in?Amyton 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 Amyton. Browse other postcodes in South Australia, or widen the search to every Australian postcode.