Home Postcode finder SA Wye Wye postcode SA Wye is a locality in South Australia covered by postcode 5291. Postcode 5291 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Wye business listing Be the first listing in Wye Common questionsWhat is the postcode for Wye?Wye, SA has the postcode 5291.What state is Wye in?Wye is in South Australia (SA).Does postcode 5291 cover more than one suburb?Yes. Postcode 5291 covers 34 localities, so the postcode alone does not identify Wye. Browse other postcodes in South Australia, or widen the search to every Australian postcode.