All NPAs within Illinois
All NPAs within Illinois

Area code 618 is a telephone area code in the North American Numbering Plan (NANP) for southern Illinois. One hundred and twenty-six municipalities are included in the numbering plan such as Carbondale, Cairo, Belleville, East St. Louis, Edwardsville, Marion, O'Fallon, Alton, Mt. Vernon, Centralia, Herrin, Salem, Metropolis, Fairview Heights, Collinsville, and Granite City

Area code 618 was among the original North American area codes created in 1947. In 1954, most of Metro East switched from 217 to 618.

618 is the only one of Illinois' four original area codes that were never split or overlaid. According to projections in 2021, 618 is expected to "exhaust" by 2025.[1]

Periodic proposals have been made for relief of the 618 area code. 730 is expected to go in effect on July 7, 2023, at which point the entire state of Illinois will be covered by overlays.

Prior to October 2021, area code 618 had telephone numbers assigned for the central office code 988. In 2020, 988 was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, which created a conflict for exchanges that permit seven-digit dialing. This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021.[2]

Cities in the 618 area code

See also

Illinois area codes: 217, 224/847, 309, 312, 331/630, 618, 708, 773, 779/815, 872
North: 217
West: 314/557, 636, 573 Area code 618 East: 812
South: 573, 270
Missouri area codes: 314/557, 417, 573, 636, 660, 816
Kentucky area codes: 270/364, 502, 606, 859
Indiana area codes: 219, 260, 317/463, 574, 765, 812/930

References

  1. ^ "Archived copy" (PDF). Archived (PDF) from the original on 2021-10-18. Retrieved 2021-10-18.((cite web)): CS1 maint: archived copy as title (link)
  2. ^ "Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)" (PDF). North American Numbering Plan Administrator. January 8, 2021. Retrieved March 9, 2021.

Coordinates: 38°04′N 88°53′W / 38.067°N 88.883°W / 38.067; -88.883