Quick answer: The 770 area code rings Atlanta's suburbs — the ring of cities outside the I-285 perimeter, surrounding the 404 downtown core. It covers Marietta, Roswell, Alpharetta, Smyrna, Sandy Springs, Lawrenceville, Duluth, Decatur, Tucker, Canton, Woodstock and dozens of others across roughly 29 counties of north Georgia. It was split off from 404 on August 1, 1995, sits in Eastern Time, and now shares the same geography with three overlay codes: 678 (1998), 470 (2010) and 943 (2022). Because of those overlays, every local call needs all 10 digits.
770 at a glance
| Fact | Value |
|---|---|
| State | Georgia |
| Region | Metro Atlanta suburbs · north Georgia |
| Counties | 29 (incl. Cobb, Gwinnett, DeKalb, Fulton suburbs, Cherokee, Henry, Forsyth, Douglas) |
| Major cities | Marietta, Roswell, Alpharetta, Smyrna, Lawrenceville |
| Cities served | 70+ |
| Population covered | ~6 million |
| Time zone | Eastern (UTC−5 / UTC−4 DST) |
| Created | August 1, 1995 |
| Split from | 404 |
| Overlays | 678 (1998), 470 (2010), 943 (2022) |
| Country / plan | United States · NANP |
Where is the 770 area code located?
770 covers the ring of suburbs around metro Atlanta — the band of cities outside the I-285 perimeter highway (the loop locals call "the Perimeter"). Inside the loop, downtown Atlanta runs on 404. Outside the loop, in every direction, is 770 country.
The core counties under the 770 footprint:
- Cobb County — Marietta, Smyrna, Kennesaw, Acworth, Powder Springs
- Fulton County (suburban / north) — Roswell, Alpharetta, Johns Creek, Milton, Sandy Springs
- Gwinnett County — Lawrenceville, Duluth, Norcross, Suwanee, Snellville, Sugar Hill
- DeKalb County (north / east) — Decatur, Tucker, Stone Mountain, Dunwoody
- Cherokee County — Canton, Woodstock, Holly Springs
- Henry County — McDonough, Stockbridge, Hampton
- Forsyth County — Cumming
- Douglas, Paulding, Fayette, Clayton, Rockdale, Coweta, Newton — outer ring
Together those counties hold roughly 6 million people and more than 70 named cities — which is why Atlanta has needed three overlay codes since 1998 to keep up with phone-number demand.
Metro Atlanta has four area codes — how the overlay works
The four Atlanta-suburb codes don't divide the metro geographically — they share it. Here's what that means in practice:
- Same region. A 770 number in Marietta, a 678 number in Lawrenceville, a 470 number in Alpharetta and a 943 number in Smyrna all sit inside the same metro. They're all "Atlanta" to a caller.
- Same local market. Calls between any pair of the four codes inside the metro are local, not long-distance.
- New numbers may use any overlay. When you order a new Atlanta-suburbs business line today, you usually get whatever code has inventory — most often 470 or 943 (the newest), less often 678 or 770 (which are mostly allocated).
- Dial all 10 digits. Because more than one code rings the same neighborhood, you have to dial the full area code + seven-digit number for every local call. Seven digits alone will not connect.
That's the picture: 770 isn't a "different part" of metro Atlanta — it's one of four labels stamped on Atlanta-suburb phone numbers.
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Cities and counties in the 770 region
770 covers 70+ cities across 29 counties. The largest:
| City | County | Approx. population |
|---|---|---|
| Sandy Springs | Fulton | 109,000 |
| Roswell | Fulton | 96,000 |
| Marietta | Cobb | 61,000 |
| Smyrna | Cobb | 56,000 |
| Alpharetta | Fulton | 65,000 |
| Lawrenceville | Gwinnett | 32,000 |
Highlights by county:
Cobb County: Marietta · Smyrna · Kennesaw · Acworth · Powder Springs · Vinings · Mableton · Austell
Fulton County (north / suburban): Roswell · Alpharetta · Johns Creek · Milton · Sandy Springs · Mountain Park
Gwinnett County: Lawrenceville · Duluth · Norcross · Suwanee · Snellville · Sugar Hill · Lilburn · Buford · Grayson
DeKalb County (north and east): Decatur · Tucker · Stone Mountain · Dunwoody · Chamblee · Lithonia
Cherokee County: Canton · Woodstock · Holly Springs · Ball Ground
Henry County: McDonough · Stockbridge · Hampton · Locust Grove
Other 770 communities: Cumming (Forsyth) · Douglasville (Douglas) · Dallas (Paulding) · Fayetteville (Fayette) · Conyers (Rockdale) · Newnan (Coweta) · Covington (Newton) · Gainesville (Hall)
If your customer base sits anywhere from Marietta in the northwest to Alpharetta in the north, Duluth in the northeast, Stockbridge in the south, or Douglasville in the west, a 770 number reads as local to them.
ZIP codes in the 770 area code
The 770 area code overlays roughly 200+ Atlanta-suburb ZIP codes. The most common ones, grouped by city:
| City | ZIP codes |
|---|---|
| Marietta | 30060, 30062, 30064, 30066, 30067, 30068 |
| Roswell | 30075, 30076 |
| Alpharetta | 30004, 30005, 30009, 30022 |
| Sandy Springs | 30327, 30328, 30342, 30350 |
| Smyrna | 30080, 30082 |
| Lawrenceville | 30043, 30044, 30045, 30046 |
| Duluth | 30096, 30097 |
| Norcross | 30071, 30092, 30093 |
| Decatur | 30030, 30032, 30033, 30034 |
| Tucker | 30084 |
| Kennesaw | 30144, 30152 |
| Woodstock | 30188, 30189 |
| Canton | 30114, 30115 |
| Snellville | 30039, 30078 |
| Stone Mountain | 30083, 30087, 30088 |
| Dunwoody | 30338, 30360 |
| Cumming | 30040, 30041 |
| Johns Creek | 30022, 30097 |
(Source: USPS ZIP code data and Georgia Public Service Commission area-code records.)
How the 770 area code works
770 is a standard 10-digit phone number in the North American Numbering Plan (NANP). The format follows the NPA-NXX-XXXX structure:
770— NPA (area code)NXX— three-digit central-office prefixXXXX— four-digit subscriber line number
Dialing rules:
| Calling from | Dial |
|---|---|
| Inside the US / Canada | 770 XXX XXXX (10-digit dialing is mandatory) |
With a leading 1 | 1 770 XXX XXXX (still works on most landlines) |
| Outside North America | +1 770 XXX XXXX |
| Any mobile (worldwide) | +1 770 XXX XXXX |
Because metro Atlanta runs on a four-code overlay, mandatory 10-digit dialing applies to every call — even calling next door. Dialing only the seven-digit local number will not connect.
Example 770 prefixes (NXX)
Hundreds of central-office prefixes are assigned within 770. A sample by area (not exhaustive):
| Area | Common prefixes (NXX) |
|---|---|
| Marietta / Smyrna | 218, 250, 333, 422, 426, 427, 432, 433, 434, 435, 436, 437, 514, 528, 590, 951, 952 |
| Roswell / Alpharetta | 442, 475, 569, 587, 594, 619, 642, 645, 754, 813, 814, 998 |
| Lawrenceville / Duluth | 277, 279, 339, 446, 476, 488, 497, 513, 564, 717, 822, 962 |
| Norcross / Tucker | 263, 270, 296, 446, 449, 638, 671, 729 |
| Decatur / Stone Mountain | 322, 484, 593, 808, 873, 982 |
| Canton / Woodstock | 213, 345, 928, 924, 926 |
| Henry County | 471, 506, 507, 898, 957 |
(Source: NANPA Central Office Code Utilization Survey and Telcodata records.)
History and origin of the 770 area code
770 has been an Atlanta-area code since 1995. Quick timeline:
| Year | Event |
|---|---|
| 1947 | NANP launches. All of Georgia is served by area code 404. |
| 1954 | 912 splits from 404, taking southern Georgia. 404 still covers all of north Georgia, including Atlanta and its suburbs. |
| August 1, 1995 | 770 splits from 404. Downtown Atlanta inside the I-285 perimeter keeps 404; everything outside the loop — all the suburbs — becomes 770. |
| 1998 | 678 added as an overlay across the same metro Atlanta geography (404 + 770). 10-digit dialing becomes mandatory. |
| 2010 | 470 added as a second overlay when 678 / 770 inventory runs low. |
| 2022 | 943 added as a third overlay as the metro continues to grow. |
Why so many codes? Atlanta's suburbs are one of the fastest-growing metros in the country. Through the late 1990s and 2000s, three forces compounded: explosive population growth in Cobb, Gwinnett and north Fulton; the mass shift from landline to mobile (every device gets a number); and aggressive number-block allocation that left blocks under-utilized.
Rather than re-carve the suburbs and force millions of existing customers to change numbers, the Georgia PSC kept stacking overlays on the same geography. Today metro Atlanta sits with four codes — 770, 678, 470 and 943 — all ringing the same neighborhoods.
Time zone of the 770 area code
770 sits in the Eastern Time Zone:
- Eastern Standard Time (EST): UTC−5 (early November through early March)
- Eastern Daylight Time (EDT): UTC−4 (early March through early November)
Reference clock — when it's 12:00 PM in 770 (Atlanta, GA):
| City | Time |
|---|---|
| New York | 12:00 PM (same) |
| Chicago | 11:00 AM |
| Los Angeles | 9:00 AM |
| London | 5:00 PM |
| Berlin | 6:00 PM |
| Mumbai | 9:30 PM |
| Singapore | 12:00 AM (next day) |
Atlanta runs on the same clock as the East Coast and is one hour ahead of Chicago / three hours ahead of the West Coast. If you're scheduling outbound calls to a 770 number from outside Georgia, target between 9 AM and 5 PM Eastern Time to land in normal Atlanta business hours.
How to get a 770 phone number
A 770 number is useful if you sell into the Atlanta suburbs, run a service business in Marietta, Roswell or Alpharetta, or want a local-feeling presence for customers in Cobb, Gwinnett or north Fulton. You don't need to live in Georgia — virtual-number providers can issue you a real 770 number that rings on any device.
The setup runs in four steps and takes minutes:
- Check availability. Search the provider's inventory for a 770 number (or port an existing 770 number you already own).
- Pick your plan. Choose the seat count and features that fit your team.
- Configure features. Wire up call forwarding, voicemail-to-email, mobile / desk-phone / softphone routing, business-hours rules and an auto-attendant.
- Go live. Activate the same day. Porting an existing 770 number runs in the background for 5–10 business days while you stay live on a temporary number.
Pricing as of mid-2026:
| Provider | Starts at | Best for |
|---|---|---|
| My Country Mobile | $12 / user / mo | Global teams; 190+ destinations |
| OpenPhone | $15 / user / mo | US-based startups |
| MightyCall | $15 / user / mo | Small businesses with toll-free needs |
| RingCentral | $30 / user / mo | Mid-market and enterprise |
| LinkedPhone | $20 / user / mo | Solo professionals and consultants |
Most providers include call forwarding, voicemail-to-email, SMS, business-hours routing and call recording on every plan.
See 770 virtual number options →
Who gains the most from a 770 number
A suburban code lifts answer rates with local customers. The teams that benefit most:
- Field-service businesses — HVAC, plumbing, electricians, landscapers, pest control — running across Cobb, Gwinnett and north Fulton. Local caller ID makes the difference between a picked-up call and voicemail.
- Local professional services — law firms, clinics, accountants, real-estate brokerages serving the Marietta–Roswell–Alpharetta corridor.
- Sales teams expanding into Georgia — SDR / AE teams targeting Atlanta-suburb buyers. A 770 caller ID beats an out-of-state code on first-touch outbound.
- Remote teams headquartered elsewhere — startups and small businesses that want an Atlanta presence without renting an Atlanta office.
Three common mistakes with 770 numbers
- Dialing only seven digits. Metro Atlanta has run on mandatory 10-digit dialing since 1998, when the 678 overlay went live. Even calling next door, you have to dial all 10 digits.
- Thinking 770 is "more local" than 678 / 470 / 943. It isn't. To an Atlanta customer, all four codes read as local — they overlay the exact same suburban geography. The reason new numbers issued today are usually 470 or 943 is simply that 770 / 678 inventory is largely allocated, not that they cover different areas.
- Assuming a 770 caller is physically in metro Atlanta. With virtual numbers and number portability, a 770 number can ring anywhere in the world.
Is 770 a spam-heavy area code?
770 is not on any "high-risk" robocall list, but as one of four codes covering a top-10 metro, it sees its share of spoofed calls. The FCC, FTC and Georgia PSC have stepped up enforcement under the STIR/SHAKEN call-authentication framework, which most US carriers fully implemented by 2021. Warning signs of a scam call include urgent payment demands, threats, or pressure to act immediately. If you receive a suspicious 770 call:
- Don't return it — scammers spoof local-looking 770 numbers to raise pickup rates.
- Report it to the FTC at reportfraud.ftc.gov.
- File a complaint with the FCC at consumercomplaints.fcc.gov.
- Add the number to your phone's block list (iOS: Phone → Recents → ⓘ → Block this Caller; Android: Phone → call log → menu → Block / Report).
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Frequently asked questions
Where is the 770 area code located?
It serves the suburban ring around metro Atlanta in north Georgia, covering roughly 29 counties including cities such as Marietta, Roswell, Alpharetta, Smyrna, Sandy Springs, Lawrenceville and Duluth.
What time zone does the 770 area code use?
Eastern Time. Observes Eastern Standard Time (EST, UTC−5) in winter and Eastern Daylight Time (EDT, UTC−4) in summer.
What is the difference between 404 and 770?
404 covers Atlanta inside the I-285 perimeter — downtown, Midtown, Buckhead and the immediate intown neighborhoods. 770 covers everything outside the loop — the suburbs. The two codes separated when 770 was split from 404 in August 1995.
What are the overlay codes for 770?
770 is overlaid by 678 (added 1998), 470 (added 2010) and 943 (added 2022). All four codes ring the same metro Atlanta geography.
Do I need to dial 10 digits for local 770 calls?
Yes. Because four codes cover the same metro, the seven-digit local part isn't unique — only the full 10-digit number is. Metro Atlanta has required 10-digit dialing since 1998.
Can I get a 770 number without being in Georgia?
Yes. Virtual phone numbers allow you to have a local Atlanta-suburb line while working remotely anywhere in the world. A new 770 line can be active within the hour; porting an existing 770 number usually takes 5–10 business days.
How fast can a 770 business number be set up?
Most numbers activate the same day, often within minutes through self-service portals.
How many ZIP codes are in the 770 area code?
Around 200+ ZIP codes overlap the 770 footprint, spanning 29 counties across north Georgia.
Is a 770 number free to call from elsewhere in the US?
For most modern mobile plans, yes — unlimited domestic calling covers calls to 770 numbers. Older landline long-distance plans may still charge per minute for out-of-state calls.
Why do I keep getting spam calls from 770 numbers?
Scammers spoof local-looking codes from large metros to raise pickup rates. You can report spoofed calls at reportfraud.ftc.gov and add the number to your block list. With STIR/SHAKEN widely deployed, your carrier should be flagging or filtering many of these automatically.
Get a 770 virtual number for your business
If you want to sound local to Atlanta-suburb customers — for sales calls into Marietta and Alpharetta, a clinic or field-service business in Roswell or Lawrenceville, or just to separate work calls from personal mobile — a virtual 770 number sets up in minutes. My Country Mobile offers 770 numbers with call forwarding, voicemail-to-email, SMS, IVR and integrations with HubSpot, Zoho, Pipedrive and Zendesk. Calls route to any device worldwide, pricing starts at $12/user/month, and over 17,500 businesses already trust MCM with their virtual phone presence.
