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# Pennsylvania Area Code 267

The 267 area code is an overlay area code that serves the Philadelphia metropolitan area in Pennsylvania, primarily covering Chester, Delaware, and Montgomery counties, as well as portions of Philadelphia itself. Established in 2000, the 267 area code was created to address the exhaustion of available phone numbers in the original 610 area code, which had been assigned to the same region since 1994. This overlay system allows both area codes to serve the same geographic territory, meaning that residents and businesses in these counties may have either a 610 or 267 phone number, and both require the full ten-digit dialing format (area code plus seven-digit number) for all local calls.

The North American Numbering Plan (NANP) is the standardized system that designates area codes like 267 throughout the United States, Canada, and other North American territories. The NANP divides North America into numbering plan areas (NPAs), each identified by a unique three-digit area code, and is administered by the North American Numbering Plan Administration (NANPA). When an area becomes saturated with phone numbers, as happened with the 610 area code, regulatory authorities implement overlay area codes like 267 to provide additional numbering capacity without requiring customers to change their existing phone numbers or service areas. This system ensures efficient management of the continent's limited telephone numbering resources while maintaining service continuity for existing subscribers.