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# Illinois Area Code 779
The 779 area code is an overlay for southern Illinois, serving the same geographic region as the 618 area code. Implemented in 2021, the 779 area code was created to address the growing demand for telephone numbers in this region, which includes cities such as Belleville, Carbondale, and Herrin. As an overlay, the 779 area code does not replace 618 but rather coexists with it, meaning both area codes serve the same territory. This arrangement allows telecommunications providers to issue new phone numbers from the 779 pool while existing 618 numbers remain valid and unchanged. Residents and businesses in the 618 service area can now receive phone numbers with either area code depending on availability and provider assignment.
The North American Numbering Plan (NANP) is the standardized system that designates area codes like 779 throughout the United States, Canada, and several Caribbean nations. The NANP divides North America into regions identified by three-digit area codes, which form the first part of the ten-digit telephone number format. When a region exhausts its available numbers within an existing area code, the NANP administrator can implement an overlay area code, as was done with 779 in Illinois, or introduce a new area code for a different geographic region. This system ensures efficient number allocation and prevents shortages while maintaining the established numbering infrastructure that allows calls to be properly routed across the continent.