Area code 404

Area code 404 is a telephone area code in the North American Numbering Plan for Atlanta, Georgia and its closest suburbs. This comprises roughly the area encircled by Interstate 285. It is an enclave area code, completely surrounded by area code 770, which serves most of Atlanta's suburbs. Both 404 and 770 are overlaid by area codes 678 and 470.

Area code 404 was created in 1947 as one the original numbering plan areas in North America, serving the entire state of Georgia. On July 1, 1954, the area from Macon southward was split off as area code 912. Area code 404 was reduced to the northern half of the state, from the Tennessee and North Carolina borders as far south as Columbus and Augusta.

Wikipedia