What is 217 area code?

The 217 area code is used in the state of Illinois in the United States. It covers cities such as Springfield, Champaign, Decatur, and Quincy. The area code was created in 1947 as one of the original North American Numbering Plan codes. Over time, the area code has been split and overlaid to accommodate the increasing demand for telephone numbers in the region. The 217 area code is currently assigned to central and western Illinois.