Area Code 770 — Atlanta, Georgia

NANP area code

770

UTC−5, UTC−4 during daylight saving

State
Georgia
Primary city
Atlanta
Time zone
Eastern
In service
1995
Overlays
470, 678, 943

The code reaches 145 communities and 36 counties across Georgia.

Was this call legitimate?

The area code itself carries no risk signal. 770 is assigned to Atlanta, Georgia, so a call from it is consistent with a real caller in that area — but the digits alone prove nothing, because they can be forged.

Caller ID is set by whoever places the call, not verified by the network. That is why neighbour spoofing works: an operation anywhere in the world can display a number that matches the area code — and often the first three digits after it — of the person being called, so the call looks local. Every community in the 770 territory is a plausible-looking origin for a forged 770 number, which is why one can be made to look like a neighbour to so many people. The same applies to its overlay codes 470, 678 and 943, which serve the same ground.

If you did not recognise the call: let it go to voicemail — a legitimate caller with real business will leave one. Do not return the call using the number shown; look the organisation up independently and call the number you found. Never confirm personal details, card numbers, or one-time codes to someone who called you, however plausible the number looked.

Codes.zone publishes no complaint counts, risk scores, or caller identities. We hold no data on individual numbers and will not estimate what we cannot source.

Local time and when to call back

Time there now

Eastern · UTC−5, UTC−4 during daylight saving

Reasonable callback window

8:00 AM – 9:00 PM

local time in Eastern

Federal rules bar telemarketing calls to a residence outside 8:00 AM–9:00 PM in the called party's own time zone. It is a sensible bound for a personal callback too — and a caller who rang you well outside it was not observing it.

Overlay codes and ten-digit dialling

770 does not have its territory to itself. 470, 678 and 943 cover the same ground, serving Atlanta and the rest of the 770 territory. An overlay is what a regulator adds when a region runs out of assignable numbers: rather than splitting the area and forcing half the residents to change their number, a second code is laid over the top and new numbers are issued from it.

The practical consequence: two neighbours on the same street can hold numbers in different area codes, so the code tells you nothing about which part of town a caller is in — and local calls must be dialled as all ten digits, because seven is no longer unambiguous.

Cities served

largest 20 by ZIP count
Communities served by area code 770, ranked by how many ZIP codes each holds.
CityZIP codesCounty
Atlanta92DeKalb County
Marietta14Cobb County
Decatur8DeKalb County
Lawrenceville6Gwinnett County
Alpharetta5Fulton County
Carrollton5Carroll County
Duluth5Gwinnett County
Gainesville5Hall County
Kennesaw5Cobb County
Norcross5Gwinnett County
Douglasville4Douglas County
Newnan4Coweta County
Stone Mountain4DeKalb County
Buford3Gwinnett County
Canton3Cherokee County
Conyers3Rockdale County
Covington3Newton County
Cumming3Forsyth County
Jonesboro3Clayton County
Peachtree City3Fayette County

125 further communities not listed. All Georgia area codes →

Each point is a community served by 770, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.
  • Reference points and footprint
  • Not an official NANPA boundary
  • Not a USPS delivery area

Scope every community matched to 770. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot), GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . Coordinates are place reference points, not boundaries.

Counties

Prefixes inside 770

We do not publish the NXX prefixes inside 770. The assignment of prefixes to rate centres comes from LERG routing data, which is proprietary, and we will not estimate it from postal data — ZIP codes and telephone prefixes do not map onto each other. Awaiting a clean-rights NPA-NXX source.

Why this code exists

770 has served this territory since 1995. It eventually ran short of exchanges to hand out, and rather than split the region and make half its residents change their number, the regulator laid 470 over the same ground in 2010, 678 over the same ground in 1998 and 943 over the same ground in 2022. New lines here are issued from the newer code, which is why a neighbour’s number may not start with 770.