Georgia · Eastern Time
678 Area Code
Area code 678 is in Georgia, serving metro Atlanta, overlaying both 404 (the city) and 770 (the suburbs). It is in the Eastern Time zone. It shares its territory with overlay codes 404, 470, 770 and 943, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 678 area code?
678 is a Georgia area code covering metro Atlanta, overlaying both 404 (the city) and 770 (the suburbs). In the wider directory it sits in the South region.
Cities in the 678 area code
- Atlanta
- Decatur
- East Point
- College Park
- Brookhaven
- Hapeville
- Forest Park
- Avondale Estates
- Druid Hills
- Clarkston
- Marietta
- Roswell
- Johns Creek
- Alpharetta
Counties served by 678
Fulton County, DeKalb County, Clayton County, Cobb County, Gwinnett County, Henry County, Cherokee County, Douglas County, Fayette County and Rockdale County.
678 overlay codes and dialing
The 678 territory is covered by an overlay of 5 area codes: 404, 470, 678, 770, 943. All of them serve the same geographic area, and the original code is 404. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 678 area code
678 went into service on January 6, 1998 as an overlay of 470, relieving number exhaustion in the Atlanta area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 678 a scam or spam risk?
678 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 678 number on your screen is no guarantee the caller is in Atlanta, GA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Georgia area codes
Explore more
See every code in Georgia, compare codes across the South region, or view all Eastern Time codes. You can also browse the 6XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
678 area code FAQ
Where is the 678 area code?
The 678 area code is in Georgia, covering metro Atlanta, overlaying both 404 (the city) and 770 (the suburbs), in the South region.
What cities are in the 678 area code?
Cities in the 678 area code include Atlanta, Decatur, East Point, College Park, Brookhaven, Hapeville, Forest Park, Avondale Estates, Druid Hills and Clarkston.
What time zone is 678 in?
678 is in the Eastern Time zone.
What is the overlay for the 678 area code?
678 shares its territory with 404, 470, 770 and 943. All 5 codes (404, 470, 678, 770, 943) serve the same area, so 10-digit dialing is required for every call.
When did the 678 area code start?
678 went into service on January 6, 1998 as an overlay of 470.
Do I have to dial 10 digits for 678?
Yes. Because 678 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 678 a toll-free or premium code?
No. 678 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.