newton postcode sa Home ›› Postcode Finder ›› SA ›› Newton Newton local listingsThe suburb of Newton is located in SA and has a postcode of 5074. Free newton business listing! 1St Francis of Assisi School57 Newton Rd 08 833740222Dog Talk16 De Ieso Court 0488 364 3643Airconditioning Repair Adelaide190 Groge Rd 0411 110 349 View more business listings in newton Search and find other Postcodes in South Australia or widen the search to Postcodes in Australia.