Home Postcode finder SA Northfield Northfield postcode SA Northfield is a locality in South Australia covered by postcode 5085. Postcode 5085 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Northfield business listing More business listings in Northfield Businesses in NorthfieldCedar College215-233 Fosters Rd · 08 82613377Design and Conquer10a Blackman Ave, Northfield South Australia 5085, Australia · 08 7083 8347Fix Laptops512A Grand Junction Road, Northfield SA 5085, Australia · 0872259232 Common questionsWhat is the postcode for Northfield?Northfield, SA has the postcode 5085.What state is Northfield in?Northfield is in South Australia (SA).Does postcode 5085 cover more than one suburb?Yes. Postcode 5085 covers 5 localities, so the postcode alone does not identify Northfield. Browse other postcodes in South Australia, or widen the search to every Australian postcode.