Home Postcode finder SA Hewett Hewett postcode SA Hewett is a locality in South Australia covered by postcode 5118. Postcode 5118 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Hewett business listing More business listings in Hewett Businesses in HewettHewett Public SchoolKingfisher Drive · 08 85221486 Common questionsWhat is the postcode for Hewett?Hewett, SA has the postcode 5118.What state is Hewett in?Hewett is in South Australia (SA).Does postcode 5118 cover more than one suburb?Yes. Postcode 5118 covers 16 localities, so the postcode alone does not identify Hewett. Browse other postcodes in South Australia, or widen the search to every Australian postcode.