Home Postcode finder SA Hope Gap Hope Gap postcode SA Hope Gap is a locality in South Australia covered by postcode 5555. Postcode 5555 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Hope Gap business listing Be the first listing in Hope Gap Common questionsWhat is the postcode for Hope Gap?Hope Gap, SA has the postcode 5555.What state is Hope Gap in?Hope Gap is in South Australia (SA).Does postcode 5555 cover more than one suburb?Yes. Postcode 5555 covers 11 localities, so the postcode alone does not identify Hope Gap. Browse other postcodes in South Australia, or widen the search to every Australian postcode.