Home Postcode finder SA Thompson Beach Thompson Beach postcode SA Thompson Beach is a locality in South Australia covered by postcode 5501. Postcode 5501 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Thompson Beach business listing Be the first listing in Thompson Beach Common questionsWhat is the postcode for Thompson Beach?Thompson Beach, SA has the postcode 5501.What state is Thompson Beach in?Thompson Beach is in South Australia (SA).Does postcode 5501 cover more than one suburb?Yes. Postcode 5501 covers 14 localities, so the postcode alone does not identify Thompson Beach. Browse other postcodes in South Australia, or widen the search to every Australian postcode.