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678 is a North American Numbering Plan area code assigned to metropolitan Atlanta, Georgia, its suburbs and exurbs. The area code was first assigned to customers signing up for new telephone service on January 15, 1998. In local shorthand, it is usually written as 6/555-1234. A new area code, 470, will be established as an overlay of 678.

The 678 area code is an overlay of the 404 and 770 area codes. It is generally reserved for use outside the northern half of Interstate 285, serving Atlanta's booming northern suburbs of Marietta, Alpharetta, and Cumming with 404 generally reserved for inside the Perimeter (I-285).

Currently, cell phone subscribers can choose from either the 404, 678, or 770 area codes when signing up for service.

Counties Served

Barrow,Bartow,Butts,Carroll,Cherokee, Clayton (Inside I- 285 part with Area code 404),Cobb,Coweta, DeKalb (Inside I-285 part with Area code 404),Douglas, Fayette,Forsyth,Fulton (Inside I-285 part with Area code 404),Gwinnett,Hall ,Heard (part with Area codes 706 and 762) , Henry,Lamar, Newton,Paulding County, Georgia,Pike,Polk County, Georgia, Rockdale, and Spaulding

See also

• NANPA Area Code Map of Georgia
• List of exchanges from AreaCodeDownload.com, 678 Area Code

Coordinates: 33°45′16″N 84°23′23″W / 33.75449°N 84.38966°W / 33.75449; -84.38966