Home Postcode finder SA Port Bonython Port Bonython postcode SA Port Bonython is a locality in South Australia covered by postcode 5600. Postcode 5600 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Port Bonython business listing Be the first listing in Port Bonython Common questionsWhat is the postcode for Port Bonython?Port Bonython, SA has the postcode 5600.What state is Port Bonython in?Port Bonython is in South Australia (SA).Does postcode 5600 cover more than one suburb?Yes. Postcode 5600 covers 13 localities, so the postcode alone does not identify Port Bonython. Browse other postcodes in South Australia, or widen the search to every Australian postcode.