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# Illinois Area Code 618
The 618 area code serves southern Illinois, covering a region that includes major cities such as Belleville, Carbondale, and East St. Louis. This area code encompasses approximately 15 counties in the southernmost portion of the state and represents a significant portion of Illinois' population outside of the Chicago metropolitan area. The 618 region is characterized by a mix of urban, suburban, and rural communities, with the southwestern portion bordering the Mississippi River and providing geographic and economic connections to Missouri and Kentucky.
The 618 area code is part of the North American Numbering Plan (NANP), a coordinated system established to manage telephone numbering across North America. The NANP divides the continent into area codes, which are assigned by the North American Numbering Plan Administration (NANPA) based on geographic regions and population density. Area codes are typically three digits, with the first digit ranging from 2-9, the second from 0-8, and the third from 1-9. The 618 area code was one of the original area codes established in 1947 and has remained relatively stable, though it has been supplemented by overlay area code 457 to accommodate growing telecommunications demand in southern Illinois.