Home Postcode finder SA Norton Summit Norton Summit postcode SA Norton Summit is a locality in South Australia covered by postcode 5136. Postcode 5136 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Norton Summit business listing More business listings in Norton Summit Businesses in Norton SummitNorton Summit Primary School15 Crescent Drive · 08 83901771 Common questionsWhat is the postcode for Norton Summit?Norton Summit, SA has the postcode 5136.What state is Norton Summit in?Norton Summit is in South Australia (SA).Does postcode 5136 cover more than one suburb?No. Postcode 5136 covers Norton Summit only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.