Home Postcodes by state SA Lyndhurst Lyndhurst postcode SA Lyndhurst is a locality in South Australia covered by postcode 5731. Postcode 5731 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Lyndhurst business listing Be the first listing in Lyndhurst Also in postcode 5731Coopers CreekSA 5731Cordillo DownsSA 5731Durham DownsSA 5731InnaminckaSA 5731Leigh CreekSA 5731Merty MertySA 5731MoolawatanaSA 5731WitchelinaSA 5731 Other places called LyndhurstLyndhurstNSW 2350LyndhurstQLD 4871LyndhurstVIC 3975 Common questionsWhat is the postcode for Lyndhurst?Lyndhurst, SA has the postcode 5731.What state is Lyndhurst in?Lyndhurst is in South Australia (SA).Does postcode 5731 cover more than one suburb?Yes. Postcode 5731 covers 9 localities, so the postcode alone does not identify Lyndhurst. Browse other postcodes in South Australia, or widen the search to every Australian postcode.