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# The 667 Area Code and North American Numbering Plan
The 667 area code is an overlay for central Maryland, primarily serving the Baltimore metropolitan area and surrounding regions. Established in 2000, it was created as an overlay to the existing 410 area code to accommodate the growing demand for telephone numbers in the region. This overlay arrangement means that both area codes serve the same geographic territory, and residents and businesses in the 667 service area may have phone numbers with either code regardless of their location. The 667 area code covers Baltimore City, Anne Arundel County, Baltimore County, Carroll County, Harford County, and Howard County, making it one of the most densely populated service areas in the state.
The North American Numbering Plan (NANP) is the standardized system that designates area codes like 667 throughout the United States, Canada, and several other North American territories. Under this system, telephone numbers are organized into a three-digit area code followed by a seven-digit local number, creating the familiar format (XXX) XXX-XXXX. The NANP is administered by the North American Numbering Plan Administration (NANPA) and ensures that telephone numbering resources are efficiently allocated and that calls are properly routed across the continent. When area codes become saturated due to population growth or increased demand for phone numbers, new overlay codes like 667 are introduced to extend the availability of numbers while maintaining the existing infrastructure and not requiring customers to change their established phone numbers.