Home Postcode finder SA Risdon Park Risdon Park postcode SA Risdon Park is a locality in South Australia covered by postcode 5540. Postcode 5540 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Risdon Park business listing More business listings in Risdon Park Businesses in Risdon ParkAirdale Primary School400-420 ANZAC Rd · 08 86323748St Mark's College455-489 The Terrace · 08 86322800 Common questionsWhat is the postcode for Risdon Park?Risdon Park, SA has the postcode 5540.What state is Risdon Park in?Risdon Park is in South Australia (SA).Does postcode 5540 cover more than one suburb?Yes. Postcode 5540 covers 14 localities, so the postcode alone does not identify Risdon Park. Browse other postcodes in South Australia, or widen the search to every Australian postcode.