Home Postcode finder SA Erith Erith postcode SA Erith is a locality in South Australia covered by postcode 5461. Postcode 5461 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Erith business listing Be the first listing in Erith Common questionsWhat is the postcode for Erith?Erith, SA has the postcode 5461.What state is Erith in?Erith is in South Australia (SA).Does postcode 5461 cover more than one suburb?Yes. Postcode 5461 covers 13 localities, so the postcode alone does not identify Erith. Browse other postcodes in South Australia, or widen the search to every Australian postcode.