Home Postcode finder SA Yallunda Flat Yallunda Flat postcode SA Yallunda Flat is a locality in South Australia covered by postcode 5607. Postcode 5607 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Yallunda Flat business listing Be the first listing in Yallunda Flat Common questionsWhat is the postcode for Yallunda Flat?Yallunda Flat, SA has the postcode 5607.What state is Yallunda Flat in?Yallunda Flat is in South Australia (SA).Does postcode 5607 cover more than one suburb?Yes. Postcode 5607 covers 50 localities, so the postcode alone does not identify Yallunda Flat. Browse other postcodes in South Australia, or widen the search to every Australian postcode.