Home Postcodes by state SA 5490 Postcode 5490 5490 is the postcode for 3 localities in SA: Caltowie, Caltowie North and Caltowie West. Localities with postcode 5490CaltowieSACaltowie NorthSACaltowie WestSA Postcode 5490 State or territory South Australia (SA) Localities 3 Council area Northern Areas Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5485 · Postcode 5491