Home Postcode finder SA Darke Peak Darke Peak postcode SA Darke Peak is a locality in South Australia covered by postcode 5642. Postcode 5642 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Darke Peak business listing Be the first listing in Darke Peak Common questionsWhat is the postcode for Darke Peak?Darke Peak, SA has the postcode 5642.What state is Darke Peak in?Darke Peak is in South Australia (SA).Does postcode 5642 cover more than one suburb?Yes. Postcode 5642 covers 5 localities, so the postcode alone does not identify Darke Peak. Browse other postcodes in South Australia, or widen the search to every Australian postcode.