Home Postcodes by state SA 5642 Postcode 5642 5642 is the postcode for 5 localities in SA: Darke Peak, Hambidge, Kielpa, Murlong and Rudall. Localities with postcode 5642Darke PeakSAHambidgeSAKielpaSAMurlongSARudallSA Postcode 5642 State or territory South Australia (SA) Localities 5 Council area Cleve; Mainly Cleve, partly Elliston Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5641 · Postcode 5650