Home Postcode finder SA Hilltown Hilltown postcode SA Hilltown is a locality in South Australia covered by postcode 5455. Postcode 5455 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Hilltown business listing Be the first listing in Hilltown Common questionsWhat is the postcode for Hilltown?Hilltown, SA has the postcode 5455.What state is Hilltown in?Hilltown is in South Australia (SA).Does postcode 5455 cover more than one suburb?No. Postcode 5455 covers Hilltown only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.