Area code 404

404Atlanta calling area
Area code 404 of the North American Numbering Plan (NANP) identifies a numbering plan area (NPA) that covers Atlanta, Georgia and its closest suburbs, roughly the area encircled by Interstate 285.wikipedia
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Area code 770

770770; 404; 678
It is an enclave area code, completely surrounded by area code 770, which serves most of Atlanta's suburbs.
It was split from area code 404 in December 1995.

Area code 912

912
On July 1, 1954, the southern portion of the state, everything from Macon southward, was split off as area code 912.
Area code 912 was split from area code 404 in 1954.

List of original NANP area codes

original area codesoriginal 86 area codesoriginal area code
Area code 404 was created in 1947 as one the original numbering plan areas in North America.

Interstate 285 (Georgia)

Interstate 285I-285Perimeter
Area code 404 of the North American Numbering Plan (NANP) identifies a numbering plan area (NPA) that covers Atlanta, Georgia and its closest suburbs, roughly the area encircled by Interstate 285.
This was also the rough boundary chosen by BellSouth for separating landline telephone exchanges in suburban area code 770 from the existing area code 404 in 1995.

Area codes 706 and 762

706706/762706 & 762
On May 3, 1992, nearly all of the old 404 territory outside of metro Atlanta was split off as area code 706.
This is bordered by area code 334 to the west in Alabama, area code 478 to the east, area code 229 to the south, and metro Atlanta's 404, 678, 770, and 470.

Atlanta

Atlanta, GeorgiaAtlanta, GAAtlanta, United States
Area code 404 of the North American Numbering Plan (NANP) identifies a numbering plan area (NPA) that covers Atlanta, Georgia and its closest suburbs, roughly the area encircled by Interstate 285.

Area codes 678 and 470

678/470678470
Both 404 and 770 are overlaid by area codes 678 and 470.
Both area codes are overlay codes for the two main area codes in the area, 404 (Atlanta and its suburbs inside Interstate 285) and 770 (Atlanta suburbs and exurbs outside 285).

Request line

contest line
Telephone numbers for high-capacity lines, such as for contest lines for radio stations, are assigned with the central office prefix 741.
In Miami, for example, numbers are 305-550-xxxx, while in metro Atlanta they are 404-741-xxxx.

Cobb County, Georgia

Cobb CountyCobbCobb (GA)
There are also other prefixes that are not assigned to just one exchange, such as 499 and 528 used by Cobb County government and formerly SPSU.
Originally in area code 404, the county was moved into area code 770 in 1995, and overlaid by area code 678 in 1998.

Decatur, Georgia

DecaturDecatur, GACity of Decatur
Generally, 404 is Atlanta itself and most suburbs inside the Perimeter (such as Decatur), while most of the metro area outside the Perimeter uses 770.

Enclave and exclave

exclaveenclaveexclaves
It is an enclave area code, completely surrounded by area code 770, which serves most of Atlanta's suburbs.

Overlay plan

overlayoverlaidoverlay area code
Both 404 and 770 are overlaid by area codes 678 and 470.

Macon, Georgia

MaconMacon, GAMacon, Ga.
On July 1, 1954, the southern portion of the state, everything from Macon southward, was split off as area code 912.

Tennessee

TNState of TennesseeTenn.
Area code 404 served the northern half of the state, from the Tennessee and North Carolina borders as far south as Columbus and Augusta.

North Carolina

NCNorthState of North Carolina
Area code 404 served the northern half of the state, from the Tennessee and North Carolina borders as far south as Columbus and Augusta.

Columbus, Georgia

ColumbusColumbus, GAMidland
Area code 404 served the northern half of the state, from the Tennessee and North Carolina borders as far south as Columbus and Augusta.

Augusta, Georgia

AugustaAugusta, GAAugusta-Richmond County
Area code 404 served the northern half of the state, from the Tennessee and North Carolina borders as far south as Columbus and Augusta.

Local access and transport area

LATALATA codeLATAs
The supply of numbers was further limited by the fact that several portions were in local access and transport areas (LATAs) which spilled into neighboring states.

Alabama

ALState of AlabamaAlabamian
The Atlanta LATA spills into Alabama, the Augusta LATA spills into South Carolina, and the far northern portion was part of the Chattanooga, Tennessee LATA.

South Carolina

SCState of South CarolinaS.C.
The Atlanta LATA spills into Alabama, the Augusta LATA spills into South Carolina, and the far northern portion was part of the Chattanooga, Tennessee LATA.

Chattanooga, Tennessee

ChattanoogaChattanooga, TNCity of Chattanooga
The Atlanta LATA spills into Alabama, the Augusta LATA spills into South Carolina, and the far northern portion was part of the Chattanooga, Tennessee LATA.

Exurb

exurbanexurbsexurban areas
As originally drawn, 706 included several exurbs of Atlanta.

BellSouth

Bell SouthBellSouth CorporationAT&T
However, BellSouth (now part of AT&T Inc.) returned them to 404 because of customer complaints.

AT&T

AT&T Inc.Southwestern Bell CorporationAT&T Latin America
However, BellSouth (now part of AT&T Inc.) returned them to 404 because of customer complaints.

Georgia Public Service Commission

Georgia State Railroad CommissionPublic Service CommissionersState Public Service Commissioner
The Georgia Public Service Commission had already planned to assign 770 to Atlanta's suburbs later in the decade.