678 Area Code
Atlanta suburbs (overlay), Georgia
Area code 678 is located in Atlanta suburbs (overlay), Georgia. It covers Atlanta metro, Sandy Springs, and surrounding areas in the Eastern time zone (UTC-5). Administered by NANPA.
Where is area code 678?
Area code 678 is located in Atlanta suburbs (overlay), Georgia. It covers Atlanta metro, Sandy Springs, and surrounding areas in the Eastern time zone (UTC-5).
Area code 678 is overlaid by area code 470. Both codes serve the same geographic region and require 10-digit dialing for local calls.
Cities Covered by Area Code 678
Area code 678 primarily serves the Atlanta suburbs (overlay) area of Georgia. The exact coverage includes Atlanta metro, Sandy Springs, and Alpharetta, along with surrounding communities and suburbs.
Time Zone
Eastern Time — UTC-5
Area code 678 operates in the Eastern Time Zone. When calling 678 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 678
Area code 678 was introduced in 1998 as a geographic area code serving Atlanta suburbs (overlay), Georgia. As demand for phone numbers grew, overlay code 470 was added to the same region, requiring 10-digit dialing for local calls. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.