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