Home Postcodes by state SA 5720 Postcode 5720 5720 is the postcode for 2 localities in SA: Pimba and Woomera. Localities with postcode 5720PimbaSAWoomeraSA Postcode 5720 State or territory South Australia (SA) Localities 2 Council area Unincorporated SA Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5710 · Postcode 5722