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Area code 770 is a telephone area code in the North American Numbering Plan (NANP) serving all or part of 29 counties in North Georgia, including most of Atlanta's suburbs. It was created in 1995 in a split of numbering plan area (NPA) 404.
When the North American Numbering Plan was created in October 1947, all of Georgia was served by area code 404. In 1954, 404 was reduced to the northern half of the state, with Macon and points south splitting off as area code 912. The remaining 404 territory remained unchanged until 1992, when most of the area outside of the immediate Atlanta metropolitan area was split off with area code 706. This was intended as a long-term solution to relieve number shortages in exchanges in North Georgia.
When 706 was created, it included several fast-growing exurbs of Atlanta. Residents of these areas complained about no longer being associated with the better-known area code 404, prompting BellSouth to return these areas to 404 soon after the split. However, even before the creation of 706, 404 was close to exhaustion due to the proliferation of cell phones, fax machines, and pagers in the fast-growing Atlanta area. BellSouth and the Georgia Public Service Commission were well aware of this, and had already planned to create a new area code for the Atlanta suburbs later in the decade. However, the restoration of the exurban areas from 706 forced further relief action sooner than anticipated.
As a result, just three years later, in 1995, almost all of Atlanta's suburban ring was split off as area code 770. [1]
Atlanta was the first city in the United States to have mandatory ten-digit dialing throughout its metro area, roughly coinciding with the 1996 Summer Olympics in Atlanta. Atlanta was used as the test case not only for its size, but also because it enjoyed the world's largest fiber optic bundle at the time (five times that of New York), and it was home to BellSouth (now part of AT&T), then the Southeastern Regional Bell Operating Company.
An additional NPA was added to both metro Atlanta overlay areas in 2022. Area code 943 entered service on March 15, 2022. [2]
Numbering plan area 770 completely surrounds 404. The two plan areas are separated roughly by Interstate 285, known locally as the Perimeter. Generally, 770 includes most of the metro area outside the Perimeter, while 404 serves Atlanta itself and most suburbs inside the Perimeter; a few cities are split between the two codes. Both codes are overlaid by 678, 470, and 943. The metro Atlanta region (404, 770, 678/470/943) is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied for calls from one portion of the metro to the other. Parts of 706/762 and north Alabama's 256/938 are local calls to Atlanta as well. [3]
When the Atlanta area was originally divided in 1995, most cellphones stayed with 404, which balanced the fact that most of the landline area went to 770.
Area code 770 serves a numbering plan area that comprises the counties of Barrow, Bartow, Butts, Carroll, Cherokee, Clayton (part with area code 404), Cobb, Coweta, Dawson, DeKalb (part with area code 404), Douglas, Fayette, Forsyth, Fulton (part with area code 404), Gwinnett, Hall, Haralson, Heard (part with area codes 706 and 762), Henry, Lamar, Meriwether (part with area codes 706 and 762), Newton, Oconee, Paulding, Pike, Polk, Rockdale, Spalding, and Walton.
The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate with the NANP.
Interstate 285 (I-285) is an auxiliary Interstate Highway encircling Atlanta, Georgia, for 63.98 miles (102.97 km). It connects the three major Interstate Highways to Atlanta: I-20, I-75, and I-85. Colloquially referred to as the Perimeter, it also carries unsigned State Route 407 (SR 407) and is signed as Atlanta Bypass on I-20, I-75, and I-85.
Area codes 905, 289, 365, and 742 are telephone area codes in the North American Numbering Plan (NANP) for the Golden Horseshoe region that surrounds Lake Ontario in Southern Ontario, Canada. The numbering plan area (NPA) comprises (clockwise) the Niagara Peninsula, the city of Hamilton, the regional municipalities of Halton, Peel, York, Durham, and parts of Northumberland County, but excludes the City of Toronto.
Area codes 314 and 557 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of Missouri, serving the city of St. Louis and most of its inner-ring suburbs in neighboring St. Louis County. The numbering plan area is bordered to the west by area code 636, which serves St. Louis' outer suburbs to the west, south, and north. Across the Mississippi River to the east, 314 is adjacent to area code 618, which serves southern Illinois and most of Metro East. Area code 557 was added to the 314 numbering plan area on August 12, 2022, to form an overlay numbering plan.
Area code 763 is a telephone area code in the North American Numbering Plan for the northwestern suburbs of Minneapolis-St. Paul, Minnesota, including cities such as Plymouth, Maple Grove, and Brooklyn Park. It was created in 2000 along with area code 952 when they were carved out of area code 612, which remained assigned only for the city of Minneapolis and a few inner-ring locales.
Area code 952 is the telephone area code in the North American Numbering Plan (NANP) for the southwestern suburbs of Minneapolis-St. Paul in the U.S. state of Minnesota. The numbering plan area (NPA) includes cities such as Bloomington, Eden Prairie, Edina and Minnetonka. It was created in 2000 along with area code 763 when they were carved out of area code 612, which now only contains Minneapolis and a few inner-ring locales.
Area code 404 is a telephone area code in the North American Numbering Plan (NANP) for Atlanta, Georgia and its closest suburbs. This comprises roughly the area encircled by Interstate 285. It is an enclave area code, surrounded by area code 770, which serves most of Atlanta's suburbs. Both 404 and 770 are overlaid by area codes 678, 470, and 943.
Area codes 706 and 762 are telephone area codes in the North American Numbering Plan (NANP) for the northern and west central parts of Georgia, but excluding metropolitan Atlanta.
Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C.
Area code 781 and 339 are telephone area codes in the North American Numbering Plan for the U.S. state of Massachusetts. The numbering plan area consists of Boston’s inner suburbs, known as the Route 128 corridor, and some outer suburbs, especially in the South Shore region. It was created as in an area code split of area code 617 on September 1, 1997. Use of 781 became mandatory February 1, 1998. Area code 339 is an overlay complex code for the same service area, activated on May 2, 2001. Since then, ten-digit dialing has been mandatory.
Area codes 617 and 857 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Massachusetts, serving the city of Boston and several surrounding communities such as Brookline, Cambridge, Newton and Quincy. Area code 617 is one of the original North American area codes created in October 1947, when it served the eastern two-thirds of Massachusetts, from roughly the western end of Worcester County to Cape Cod and the South Coast.
Area codes 678, 470, and 943 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. State of Georgia in the Atlanta metropolitan area. The area codes are assigned in an overlay plan to a combined numbering plan area (NPA) consisting of 404 and 770.
Area codes 410, 443, and 667 are telephone area codes in the North American Numbering Plan (NANP) for the eastern half of the U.S. state of Maryland. The numbering plan area (NPA) includes the Baltimore metropolitan area and the Eastern Shore. The three area codes are overlay codes for one numbering plan area, among which 410 was the initial area code for the NPA, when it was split from area code 301 in 1991. 443 and 667 found assignment primarily in cellular service and for competitive local exchange carriers, such as Comcast and Cavalier Telephone, when introduced, but have since become universal in carrier availability.
Area code 334 is a telephone area code in the North American Numbering Plan (NANP) for southeastern Alabama. It was created on January 15, 1995, in an area code split from area code 205. It was the first new area code in Alabama since the announcement of the area code system in 1947. To permit a transition period for the reconfiguration of equipment, such as computers and fax machines, use of area code 205 continued in the 334 region through May 13, 1995.
Area code 360 is a telephone area code in the North American Numbering Plan (NANP) for western Washington state outside metropolitan Seattle and west of the Cascade Mountains. Its numbering plan area (NPA) comprises all of western Washington outside urban King, Pierce, and Snohomish counties and Bainbridge Island, Until January 15, 1995, when the area code commenced service, the numbering plan area (NPA) was served by area code 206, Washington's original area code since 1947.
Area codes 609 and 640 are telephone overlay area codes in the North American Numbering Plan (NANP) for the central and southern parts of the U.S. state of New Jersey. The numbering plan area includes the cities of Trenton, Princeton, Ewing, Hamilton, and southeastern parts of the state and the Jersey Shore, including Atlantic City and Long Beach Island. In terms of geographic coverage, it is the largest numbering plan area in New Jersey. Area code 609 was created in a split of area code 201 in c. 1956. Area code 640 is an additional area code for the area, created on September 17, 2018.
Area code 912 is a telephone area code in the North American Numbering Plan (NANP) for the southeastern part of the U.S. state of Georgia. The numbering plan area contains Savannah, Richmond Hill, Hinesville, Vidalia, Metter, Reidsville, Homerville, Waycross, Brunswick, Folkston, Douglas, Statesboro, Ludowici, Jesup and Kingsland. The area code was created in 1954 in an area code split from area code 404, which had been assigned to the entire state in 1947.
Perimeter is a major edge city in metro Atlanta, Georgia, United States. It is centered on Perimeter Mall, the nucleus around which it has formed. Perimeter is located north of Atlanta proper, and lies within three cities: Dunwoody, Sandy Springs, and Brookhaven. It is one of metro Atlanta's largest business districts, and one of the largest edge cities in the United States, comprising over 29 million square feet (2,700,000 m2) of office space, 6 million square feet (560,000 m2) of retail space, and 40,000 residents.
Metro Atlanta, designated by the United States Office of Management and Budget as the Atlanta–Sandy Springs–Roswell metropolitan statistical area, is the most populous metropolitan statistical area in the U.S. state of Georgia and the sixth-largest in the United States, based on the July 1, 2023 metropolitan area population estimates from the U.S. Census Bureau. Its economic, cultural, and demographic center is Atlanta, and its total population was 6,307,261 in the 2023 estimate from the U.S. Census Bureau.
| North: 706/762 | ||
| West: 256/938 | 770 and 678/470/943 surrounds 404 | East: 706/762 |
| South: 478, 706/762 | ||
| Alabama area codes: 205/659, 251, 256/938, 334 | ||