Home Postcode finder SA Middleton Middleton postcode SA Middleton is a locality in South Australia covered by postcode 5213. Postcode 5213 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Middleton business listing More business listings in Middleton Businesses in MiddletonBeyond The Boardroom44 Victor Harbor Goolwa Rd · 0885543857Beyond The Boardroom44 Victor Harbor Goolwa Rd Middleton SA · 0885543857Snow & Surf Travel Company44 Victor Harbour rd · (08) 8223 5512 Common questionsWhat is the postcode for Middleton?Middleton, SA has the postcode 5213.What state is Middleton in?Middleton is in South Australia (SA).Does postcode 5213 cover more than one suburb?No. Postcode 5213 covers Middleton only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.