Home Postcode finder SA Peachna Peachna postcode SA Peachna 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 Peachna business listing Be the first listing in Peachna Common questionsWhat is the postcode for Peachna?Peachna, SA has the postcode 5607.What state is Peachna in?Peachna 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 Peachna. Browse other postcodes in South Australia, or widen the search to every Australian postcode.