Home Postcode finder SA Smithfield Plains Smithfield Plains postcode SA Smithfield Plains 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 Smithfield Plains business listing More business listings in Smithfield Plains Businesses in Smithfield PlainsAdelaide Caravan Palina Court · 61882841569Caravan Repairs Adelaide2-14 Palina Court · 08 8284 1569Mark Oliphant CollegeCnr Buchanan Rd & Heddie St · 08 82260819 Common questionsWhat is the postcode for Smithfield Plains?Smithfield Plains, SA has the postcode 5114.What state is Smithfield Plains in?Smithfield Plains 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 Smithfield Plains. Browse other postcodes in South Australia, or widen the search to every Australian postcode.