northfield postcode sa Home ›› Postcode Finder ›› SA ›› Northfield Northfield local listingsThe suburb of Northfield is located in SA and has a postcode of 5085. Free northfield business listing! 1Ross Smith High School181-201 Hampstead Rd 08 826157442Northfield Primary School1-33 North Ave 08 826226073Cedar College215-233 Fosters Rd 08 82613377 View more business listings in northfield Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.