Kansas City Community Release Center 816-842-7467
When the North American Numbering Plan Administration area code map was created in 1947, Missouri was assigned just two area codes; 816 in the west, and area code 314, which included St. Louis, in the east. However, before area codes began use, 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.
Recent area code additions in Missouri[edit source | edit]
Platte County - Population 89,322
DeKalb County - Population 71,109
Jackson County - Population 53,227
Clinton County - Population 37,762
Johnson County - Population 25,540
Ray County - Population 23,494