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Area Code 660 History and Coverage

Area code 660 was introduced in 1997 through a geographic split of Missouri’s 816 territory. The change left 816 centered on the Kansas City metropolitan area and its nearby Missouri suburbs, while 660 took over a large inland portion of the former service area. It was one of several numbering-plan changes that reflected the growing need for additional telephone numbers outside Missouri’s original area-code arrangement.

The 660 region is defined less by one dominant urban center than by a wide network of county seats, agricultural communities, college towns, and regional trade centers. Its northern reach includes portions of the state near the Iowa line, while its southern and central portions extend into the Missouri River country and the plains west of the state’s central interior. Communities such as Warrensburg, Chillicothe, Marshall, Maryville, and Kirksville fall within the code’s general footprint.

Unlike an overlay, the 1997 change geographically divided the prior 816 territory into separate numbering areas. The boundary preserved 816 for the Kansas City-side portion of northwestern Missouri, with 660 serving the surrounding nonmetropolitan districts. The code’s coverage follows Missouri’s long-established pattern of regional centers connected by highways and rail corridors rather than a single continuous metropolitan area.