#317 AREA CODE CODE#
708 was retained for the southern suburbs, while the northern suburbs became 847 and the western suburbs became 630.Īs a solution, all of the city outside of the downtown area was split off as area code 773 on October 11, 1996, making Chicago one of the few cities in the nation to be split between multiple area codes, along with New York City and Los Angeles. This factor also forced 708 to be split in 1996, just seven years after it split from 312. Additionally, the Chicago LATA extends into northwest Indiana, meaning several numbers in Indiana's 219 weren't available for use. However, within only five years, 312 was on the verge of exhaustion once again due to the proliferation of cell phones, pagers and fax machines in the 1990s. The 1989 split was intended as a long-term solution to relieve exchanges in one of the largest toll-free calling zones in the nation. On November 11, 1989, the suburbs were assigned area code 708 and 312 was reduced to Chicago. Īrea code 312 originally served almost all of the Chicago metropolitan area in Illinois, except for portions of Grundy, Kane, Kankakee, McHenry, and Will counties located in the numbering plan area of the rest of northern Illinois, 815.
![317 area code 317 area code](https://i.pinimg.com/474x/4c/f7/c7/4cf7c7ca6c91bcdb517446ecea67a237.jpg)
As a result of Illinois' dense population, particularly in the north, the state was split between four NPAs, given that each NPA could only accommodate approximately 500 central offices.
![317 area code 317 area code](http://m.countrycallingcodes.com/graphics/maps/State_Area_Code_Maps/Indiana-small.jpg)
The original numbering plan area 312, as of 1947-1989Īrea code 312 was assigned to one of the original 86 numbering plan areas (NPAs) created in 1947 for the North American Numbering Plan.