Georgia · Eastern Time
770 Area Code
Area code 770 is in Georgia, serving suburban metro Atlanta ring surrounding the 404 core, northwest Georgia. It is in the Eastern Time zone. It shares its territory with overlay codes 470, 678 and 943, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 770 area code?
770 is a Georgia area code covering suburban metro Atlanta ring surrounding the 404 core, northwest Georgia. In the wider directory it sits in the South region.
Cities in the 770 area code
- Marietta
- Roswell
- Johns Creek
- Alpharetta
- Lawrenceville
- Smyrna
- Kennesaw
- Duluth
- Newnan
- Peachtree City
- Douglasville
- McDonough
- Conyers
- Woodstock
Counties served by 770
Cobb County, Gwinnett County, Fulton County, Clayton County, Henry County, Cherokee County, Douglas County, Fayette County, Rockdale County and Coweta County.
770 overlay codes and dialing
The 770 territory is covered by an overlay of 4 area codes: 470, 678, 770, 943. All of them serve the same geographic area, and the original code is 770. 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 770 area code
770 went into service on August 1, 1995, created when it was split from 404. It serves Marietta and the surrounding part of Georgia, and today shares its territory with overlay codes 470, 678 and 943. For how codes are created, split, and overlaid, see how area codes work.
Is 770 a scam or spam risk?
770 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 770 number on your screen is no guarantee the caller is in Marietta, 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 7XX 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
770 area code FAQ
Where is the 770 area code?
The 770 area code is in Georgia, covering suburban metro Atlanta ring surrounding the 404 core, northwest Georgia, in the South region.
What cities are in the 770 area code?
Cities in the 770 area code include Marietta, Roswell, Johns Creek, Alpharetta, Lawrenceville, Smyrna, Kennesaw, Duluth, Newnan and Peachtree City.
What time zone is 770 in?
770 is in the Eastern Time zone.
What is the overlay for the 770 area code?
770 shares its territory with 470, 678 and 943. All 4 codes (470, 678, 770, 943) serve the same area, so 10-digit dialing is required for every call.
When did the 770 area code start?
770 went into service on August 1, 1995.
Do I have to dial 10 digits for 770?
Yes. Because 770 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 770 a toll-free or premium code?
No. 770 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.