The 770 area code serves the suburbs of metro Atlanta in Georgia, wrapping around the city across several counties. Created in 1995 in a split from Atlanta’s 404 code, it shares the metro today with the 678, 470, and 943 overlays. If a 770 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 770 at a Glance
| Detail | Information |
|---|---|
| Area Code | 770 |
| State | Georgia (GA) |
| Major Cities | Marietta, Roswell, Lawrenceville, Sandy Springs |
| Time Zone | Eastern Time (ET) |
| Country Code | +1 (USA) |
| Overlay Codes | 404, 678, 470, 943 (metro Atlanta) |
Geographic Coverage & Major Cities
Area code 770 covers the suburban ring around Atlanta, including Cobb, Gwinnett, north Fulton, Clayton, and Henry counties. It forms a band of suburbs around the 404 urban core.
- Marietta & Smyrna – major Cobb County cities
- Roswell & Alpharetta – affluent north Fulton suburbs
- Lawrenceville & Duluth – fast-growing Gwinnett communities
- Sandy Springs & Marietta – established metro suburbs
From corporate campuses to sprawling residential communities, a 770 number is closely tied to the identity of Atlanta’s suburbs.
A Brief History of Area Code 770
Area code 770 was created in 1995 in a split from the 404 code, taking the suburbs as metro Atlanta grew. The 678 overlay was added across the whole metro in 1998, followed by 470 in 2010 and 943 in the 2020s, all under mandatory 10-digit dialing.
Time Zone & Best Time to Call
Numbers in the 770 area code use Eastern Time (ET). The region observes Daylight Saving Time, shifting from EST (UTC-5) to EDT (UTC-4) between March and November each year.
How to Dial Phone Numbers in Area Code 770
Because 770 shares its region under an overlay, the area requires 10-digit dialing on every call.
Calling within the United States or Canada
- 10-digit dialing: Include the area code – 770-XXX-XXXX.
- 11-digit dialing: You can also dial 1-770-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 770 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 770 XXX XXXX
- From any mobile phone worldwide: +1 770 XXX XXXX
Is Area Code 770 a Scam? Safety & Protection Tips
Area code 770 is a legitimate Georgia area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 770, faking the caller ID so their number appears to come from a trusted local line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of suspicious activity seeking your account details |
| Utility shut-off threats | Fake Georgia Power disconnection demands |
| Package delivery scams | Fake texts or calls about a failed delivery with a bad link |
How to report, block, and look up 770 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in Georgia
Area code 770 shares and borders several other Georgia codes:
- 404 – the city of Atlanta, from which 770 split (see our 404 area code guide)
- 678, 470 & 943 – overlays covering the entire metro Atlanta region (see our 678 area code guide)
- 706 & 762 – north Georgia (see our 706 area code guide)
- 478 – central Georgia and Macon to the south (see our 478 area code guide)
Explore more codes across the state on our Georgia area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Georgia:
- Florida – area code 305
- Alabama – area code 205
- Tennessee – area code 615
- North Carolina – area code 704
- South Carolina – area code 803
Frequently Asked Questions About Area Code 770
Where is the 770 area code located?
Area code 770 covers the suburbs of metro Atlanta, including Marietta, Roswell, Lawrenceville, and Sandy Springs. It operates on Eastern Time and shares the metro with 404, 678, 470, and 943.
What is the difference between 770 and 404?
404 covers the city of Atlanta, while 770 covers the surrounding suburbs. The 678, 470, and 943 overlays sit on top of both.
Is 770 a landline or cell phone area code?
Both. Area code 770 serves landlines, mobile phones, and VoIP numbers throughout the Atlanta suburbs.
Should I answer a call from an unknown 770 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 770 Guides
- Is a 770 call safe? Read Is area code 770 a scam? Spam & safety guide.
- Local coverage: see the Atlanta area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.