Home Postcodes by state SA 5605 Postcode 5605 5605 is the postcode for 2 localities in SA: Butler and Tumby Bay. Localities with postcode 5605ButlerSATumby BaySA Postcode 5605 State or territory South Australia (SA) Localities 2 Council area Tumby Bay Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5604 · Postcode 5606