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# Connecticut Area Code 959
The 959 area code is an overlay area code for Connecticut that was introduced in 2021 to serve the central and southern portions of the state, including the cities of Hartford, New Haven, and Waterbury. Like other overlay area codes, 959 does not replace an existing area code but rather shares the same geographic region with the 860 area code, which has served central Connecticut since 1995. This means that both area codes serve the same territory, and residents and businesses in this region must dial the full 10-digit phone number (including the area code) for all local calls, even when calling nearby numbers within their community. The implementation of 959 was necessary due to the exhaustion of available phone numbers within the 860 area code, driven by the increasing demand for telephone lines from businesses, mobile devices, and other telecommunications services.
The North American Numbering Plan (NANP) is the standardized system that designates and manages area codes across North America, including the United States, Canada, and several Caribbean nations. Administered by the North American Numbering Plan Administration (NANPA), this system assigns three-digit area codes to specific geographic regions to organize the vast network of telephone numbers. When existing area codes become depletedtypically due to population growth, increased business activity, or technological expansionNANPA authorizes the creation of overlay codes like 959 to meet the continued demand for new phone numbers while maintaining the existing infrastructure and area code assignments.