Home Postcode finder SA Ballast Head Ballast Head postcode SA Ballast Head is a locality in South Australia covered by postcode 5221. Postcode 5221 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Ballast Head business listing Be the first listing in Ballast Head Common questionsWhat is the postcode for Ballast Head?Ballast Head, SA has the postcode 5221.What state is Ballast Head in?Ballast Head is in South Australia (SA).Does postcode 5221 cover more than one suburb?Yes. Postcode 5221 covers 3 localities, so the postcode alone does not identify Ballast Head. Browse other postcodes in South Australia, or widen the search to every Australian postcode.