Home Postcode finder SA Hawthorndene Hawthorndene postcode SA Hawthorndene is a locality in South Australia covered by postcode 5051. Postcode 5051 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Hawthorndene business listing More business listings in Hawthorndene Businesses in HawthorndeneHawthorndene Primary SchoolSuffolk Rd · 08 82783551 Common questionsWhat is the postcode for Hawthorndene?Hawthorndene, SA has the postcode 5051.What state is Hawthorndene in?Hawthorndene is in South Australia (SA).Does postcode 5051 cover more than one suburb?Yes. Postcode 5051 covers 4 localities, so the postcode alone does not identify Hawthorndene. Browse other postcodes in South Australia, or widen the search to every Australian postcode.