Home Postcode finder SA Warnertown Warnertown postcode SA Warnertown is a locality in South Australia covered by postcode 5540. Postcode 5540 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Warnertown business listing Be the first listing in Warnertown Common questionsWhat is the postcode for Warnertown?Warnertown, SA has the postcode 5540.What state is Warnertown in?Warnertown is in South Australia (SA).Does postcode 5540 cover more than one suburb?Yes. Postcode 5540 covers 14 localities, so the postcode alone does not identify Warnertown. Browse other postcodes in South Australia, or widen the search to every Australian postcode.