<P> Area codes 678 and 470 are North American Numbering Plan area codes assigned to metropolitan Atlanta, Georgia . Both area codes are overlay codes for the numbering plan areas 404 (Atlanta) and 770 (Atlanta suburbs and exurbs). Both area codes were introduced to relieve telephone exchanges in what is one of the largest toll - free calling areas in the world . No long - distance charges are applied for calls from one portion of the area to another, regardless of the area codes . </P> <P> Numbers in area code 678 were first assigned to customers signing up for new telephone service on January 15, 1998; 470 was activated on February 26, 2010 . Although ten - digit dialing had been used in the Atlanta area since area code 770 was introduced in 1995, it was not until January 1, 1998, when 678 was implemented, that ten - digit dialing finally became required across the entire metro area . </P>

Where does the area code 470 come from