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# Illinois Area Code 464
The 464 area code is an overlay area code serving the Chicago metropolitan area in Illinois, officially implemented on November 19, 2021. As an overlay code, it covers the same geographic region as the existing 773 area code, which serves Chicago's city limits and surrounding areas. The North American Numbering Plan (NANP) introduced overlay area codes as a solution to the exhaustion of available phone numbers within traditional geographic boundaries. Rather than splitting a region into separate areas with different codes, overlay codes allow multiple area codes to serve the same territory, enabling more phone numbers to be distributed without disrupting existing service areas or requiring customers to change their numbers.
The North American Numbering Plan, administered by the North American Numbering Plan Administrator (NANPA), designates area codes based on projected telecommunications demand and existing infrastructure needs. When a region approaches exhaustion of available numberstypically when 85% capacity is reachedregulators authorize new area codes through a systematic process. For the 464 code, the Illinois Commerce Commission and the Federal Communications Commission determined that the Chicago area's continued growth and demand for phone numbers necessitated an additional overlay. Customers within the 464 service area may receive new phone numbers with this code, while existing 773 numbers remain unchanged, ensuring a smooth transition that maintains service continuity while accommodating future growth.