Home Postcode finder SA Flaxman Valley Flaxman Valley postcode SA Flaxman Valley is a locality in South Australia covered by postcode 5353. Postcode 5353 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Flaxman Valley business listing Be the first listing in Flaxman Valley Common questionsWhat is the postcode for Flaxman Valley?Flaxman Valley, SA has the postcode 5353.What state is Flaxman Valley in?Flaxman Valley is in South Australia (SA).Does postcode 5353 cover more than one suburb?Yes. Postcode 5353 covers 11 localities, so the postcode alone does not identify Flaxman Valley. Browse other postcodes in South Australia, or widen the search to every Australian postcode.