Area code 816 is the area code for Kansas City, St. Joseph, and all or part of 15 surrounding counties in northwestern Missouri. This area code originally covered most of the northern and western two-thirds of the state, including its borders with Arkansas, Illinois, Iowa, Kansas, Nebraska, and Oklahoma, but has been reduced so that it only serves a ribbon bordering Kansas. Within Missouri, 816 borders only area code 660, the latter being a relief code when 816 was nearing exhaustion.
When the North American Numbering Plan was created in 1947, Missouri was divided into two numbering plan areas . Area code 816 served all points west of Jefferson City, while area code 314 served the east from Jefferson City to St. Louis. However, in 1951 a third NPA, area code 417, was created for the southwest, including the cities of Branson, Joplin, and Springfield.
Source: Wikipedia.org
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