Home Postcode finder SA Port Davis Port Davis postcode SA Port Davis 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 Port Davis business listing Be the first listing in Port Davis Common questionsWhat is the postcode for Port Davis?Port Davis, SA has the postcode 5540.What state is Port Davis in?Port Davis 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 Port Davis. Browse other postcodes in South Australia, or widen the search to every Australian postcode.