Charleston is a small town in the Adelaide Hills of South Australia. It is situated on the Onkaparinga Valley Road between Woodside and Mount Torrens, on the main route from the Adelaide Hills to the Barossa Valley. Most of the local businesses are on the Onkaparinga Valley Road, while the largest number of houses are on Newman Road. Charleston is served by a community postal agency called the Bookpost which is also a bookshop, internet cafe and General Store.