Area code 660 comprised the rural eastern and northwestern portions of the then-current 816 area to minimize disruption to subscribers in the more densely populated urban areas. The rate centers of Lexington (259) and Warrensburg (429) moved to 660, despite being generally considered a part of the Kansas City area.
Area code 660 was established to minimize disruption to subscribers in more densely populated urban areas, encompassing the rural eastern and northwestern parts of the existing 816 area. The rate centers of Lexington (259) and Warrensburg (429), while generally considered part of Kansas City, were moved to 660.