Sugar Hill, GA utilizes an area code overlay in which area codes 470, 678 and 770 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. The area code overlay which is in use today was put into service on February 10, 2010 when area code 470 implemented.
In addition to Sugar Hill, GA area codes 470, 678 and 770 serve the portion of the Atlanta Metropolitian Area that is outside the I-285 perimeter highway which encircles Atlanta, including the larger cities and communities of Alpharetta, Atlanta, College Park, Douglasville, Duluth, Dunwoody, Forest Park, Gainesville, Griffin, Kennesaw, Lawrenceville, Mableton, Marietta, North Atlanta, Peachtree City, Redan, Roswell, Sandy Springs, Smyrna, and Tucker in addition to many smaller communities. Areas inside the I-285 perimeter highway which encircles Atlanta are assigned area codes 470, 678 and 404.
Sugar Hill, GA is located in Gwinnett County and observes the Eastern Time Zone.