Home Postcode finder SA One Tree Hill One Tree Hill postcode SA One Tree Hill is a locality in South Australia covered by postcode 5114. Postcode 5114 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free One Tree Hill business listing More business listings in One Tree Hill Businesses in One Tree HillOne Tree Hill Primary SchoolMcGilp Rd · 08 82807027 Common questionsWhat is the postcode for One Tree Hill?One Tree Hill, SA has the postcode 5114.What state is One Tree Hill in?One Tree Hill is in South Australia (SA).Does postcode 5114 cover more than one suburb?Yes. Postcode 5114 covers 12 localities, so the postcode alone does not identify One Tree Hill. Browse other postcodes in South Australia, or widen the search to every Australian postcode.