Home Postcode finder SA Nene Valley Nene Valley postcode SA Nene Valley 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 Nene Valley business listing Be the first listing in Nene Valley Common questionsWhat is the postcode for Nene Valley?Nene Valley, SA has the postcode 5291.What state is Nene Valley in?Nene Valley 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 Nene Valley. Browse other postcodes in South Australia, or widen the search to every Australian postcode.