Area codes in the United States are a system of three-digit geographical codes for identifying telephone service areas, such as cities, regions or whole states.
It is a telephone area code that contains the necessary information for routing calls from one place to another without dialing long distance. The purpose of an area code is to establish and simplify the process of assigning phone numbers to carriers while still assisting in directing callers within the country using regular numerical prefixes.
There are two main ways in which area codes are used: business and residential. Residential phone numbers are assigned from an area code to a number regardless of where the actual customer lives. Businesses use the area code as an identifier for the specific geographic region of a number.
Why do we use area codes?
The number of telephone subscribers increased dramatically during the second half of the 20th century, resulting in an uneven distribution of telephone numbers throughout the country. This meant that customers often had to dial more than one area code when they called a particular city or region.
Area codes date back to 1947, when AT&T built the first seven-digit local calling number for New York City's 212 area code (the second largest in 1953). The Federal Communications Commission (FCC) signed off on area codes by 1953, and area codes were created in every U.S. state and territory by 1956.
Here is a list of USA Area Codes:
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