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area code 816
Area Code 816 is the area code for most of northwestern Missouri; it includes the Kansas City Metropolitan Area, and the city of St. Joseph to the north. This area code originally covered the entire northwestern quadrant of Missouri, including its borders with Iowa, Kansas, and Nebraska, but has been reduced so that only Kansas borders 816. Within Missouri, 816 borders only area code 660, the latter being a relief code when 816 was nearing exhaustion.
==History of area codes in Missouri==
When the North American Numbering Plan Administration area code map was created in 1947, Missouri was assigned just two area codes. 816 was to serve all points west of Jefferson City, while area code 314 was to serve the east, including St. Louis. In 1951 a third code for Missouri, 417, was carved out of its southwest, including the cities of Branson, Joplin, and Springfield.
The assignment of 816 to Kansas City was somewhat unusual, since the North American Numbering Plan Administrator wanted to keep the number of "clicks" to a minimum for large cities given the rotary dialing technology of the time. 816 has 15 clicks, one of the most for an original area code assigned to a major city.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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