Home Postcode finder SA St Agnes St Agnes postcode SA St Agnes is a locality in South Australia covered by postcode 5097. Postcode 5097 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free St Agnes business listing More business listings in St Agnes Businesses in St AgnesArdtornish Primary School2 Saarinen Ave · 08 82648099AsohmSt Agnes · 088396 4358Child Support ConsultingPO Box 911 · 1300 584 006 Common questionsWhat is the postcode for St Agnes?St Agnes, SA has the postcode 5097.What state is St Agnes in?St Agnes is in South Australia (SA).Does postcode 5097 cover more than one suburb?Yes. Postcode 5097 covers 3 localities, so the postcode alone does not identify St Agnes. Browse other postcodes in South Australia, or widen the search to every Australian postcode.