Home Postcode finder SA Mount Osmond Mount Osmond postcode SA Mount Osmond is a locality in South Australia covered by postcode 5064. Postcode 5064 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Mount Osmond business listing Be the first listing in Mount Osmond Common questionsWhat is the postcode for Mount Osmond?Mount Osmond, SA has the postcode 5064.What state is Mount Osmond in?Mount Osmond is in South Australia (SA).Does postcode 5064 cover more than one suburb?Yes. Postcode 5064 covers 6 localities, so the postcode alone does not identify Mount Osmond. Browse other postcodes in South Australia, or widen the search to every Australian postcode.