Home Postcode finder SA Neales Flat Neales Flat postcode SA Neales Flat is a locality in South Australia covered by postcode 5374. Postcode 5374 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Neales Flat business listing Be the first listing in Neales Flat Common questionsWhat is the postcode for Neales Flat?Neales Flat, SA has the postcode 5374.What state is Neales Flat in?Neales Flat is in South Australia (SA).Does postcode 5374 cover more than one suburb?Yes. Postcode 5374 covers 15 localities, so the postcode alone does not identify Neales Flat. Browse other postcodes in South Australia, or widen the search to every Australian postcode.