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Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay .
Lists of North American area codes. The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries.
Area code 650. Coordinates: 37.5°N 122.3°W. Numbering plan areas in California (blue) and border states. Area code 650 is shown in red. Area code 650 is a telephone area code in the North American Numbering Plan (NANP) for the San Francisco Bay Area in the U.S. state of California.
Clickable map of Colorado area codes in blue (with bordering states). Area code 719 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Colorado.
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.
Clickable map of Colorado area codes in blue (with bordering states). Area code 970 is a telephone area code in the North American Numbering Plan (NANP) for most of the western and northern parts of the U.S. state of Colorado.
Area code 949. Coordinates: 33.6°N 117.7°W. Numbering plan areas in California (blue) and border states. Area code 949 is shown in red. Area code 949 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of California in southern Orange County.
Area code 312 is a telephone area code in the North American Numbering Plan for the city of Chicago, including downtown, the Chicago Loop, and its immediate environs. The numbering plan area is completely surrounded by area code 773, which serves the rest of Chicago.
The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state, respectively. As of July 2023, California has 38 active area codes.
Area code 828 is a telephone area code in the North American Numbering Plan (NANP) for most of the western third of the U.S. state of North Carolina. The numbering plan area (NPA) comprises the Blue Ridge Mountains and most of the Foothills.