What is what area code is 660?

Area code 660 is a North American telephone area code serving a large portion of the central region of Missouri. It covers cities such as Sedalia, Warrensburg, Marshall, Chillicothe, and Kirksville. Area code 660 was established on October 12, 1997, as an overlay of area code 816. It was created to accommodate the increasing demand for telephone numbers in the region.