Home Postcodes by state SA 5609 Postcode 5609 5609 is the postcode for Whyalla Jenkins, SA. Localities with postcode 5609Whyalla JenkinsSA Postcode 5609 State or territory South Australia (SA) Localities 1 Council area Whyalla Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5608 · Postcode 5630