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# Georgia Area Code 678

The 678 area code serves the northern metropolitan Atlanta region in Georgia, covering areas including Marietta, Alpharetta, Roswell, and surrounding communities in Cobb, Fulton, DeKalb, and Cherokee counties. Established in 2000 as an overlay to the existing 770 area code, the 678 area code was created to address the rapidly growing demand for telephone numbers in the booming Atlanta suburbs. As one of the fastest-growing regions in the United States during the late 1990s, the Atlanta metropolitan area experienced such significant population and business expansion that the original 770 area code could not accommodate the volume of new phone number requests. The 678 area code has since become one of the most populous area codes in North America, serving millions of residents and businesses throughout its coverage area.

The 678 area code operates within the North American Numbering Plan (NANP), a unified telephone numbering system that coordinates phone numbers across the United States, Canada, and several Caribbean nations. Under this system, area codes are strategically assigned to geographic regions, with each area code containing multiple telephone exchanges that can support millions of individual phone numbers. The NANP is administered by the North American Numbering Plan Administrator (NANPA), an organization that ensures efficient allocation of numbering resources and prevents conflicts between carriers. As an overlay area code, 678 shares the same geographic territory as 770, meaning residents and businesses in the region may have either number regardless of their physical location, requiring all callers to dial the full ten-digit number (including area code) for all local calls.