Decatur, GA utilizes an area code overlay in which area codes 404, 470 and 678 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.
In addition to Decatur, GA area codes 470, 678 and 404 serve the city of Atlanta and the portion of the Atlanta Metropolitian Area that is inside the I-285 perimeter highway which encircles Atlanta, including the larger cities and communities of Candler-Mcafee, College Park, East Point, Forest Park, North Atlanta, Sandy Springs, and Tucker in addition to many smaller communities. Areas outside the I-285 perimeter highway which encircles Atlanta are assigned area codes 470, 678 and 770.
Decatur, GA is located in DeKalb County and observes the Eastern Time Zone. View our Times by Area Code tool.