Home Postcode finder SA Blyth Blyth postcode SA Blyth is a locality in South Australia covered by postcode 5462. Postcode 5462 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Blyth business listing More business listings in Blyth Businesses in BlythBlyth Primary SchoolAugust St · 08 88445195 Common questionsWhat is the postcode for Blyth?Blyth, SA has the postcode 5462.What state is Blyth in?Blyth is in South Australia (SA).Does postcode 5462 cover more than one suburb?No. Postcode 5462 covers Blyth only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.