An area code is a three-digit number that represents a specific geographical region. The first digit of an area code is called the NPA (Numbering Plan Area) and the second and third digits are called the central office exchange. The NPA plus the central office exchange make up your complete 10-digit phone number.
Area codes were created in 1947 to help with telephone call routing. At that time, there were 86 area codes in use across the United States. Today, there are nearly 300 area codes in use throughout North America.
While most people think of an area code as being associated with a particular city or state, this is not always the case. For example, while Los Angeles has its own unique area code (213), so do several other cities within California including San Francisco (415), San Diego (619), and Sacramento (916).
Area codes can be used to determine where a person is calling from, or where they live. For example, if someone calls you from Los Angeles, you can tell by their area code that they live in California. Similarly, if someone has a 646 area code, you know they’re from New York City.
Area codes can also be used to find out what time zone someone is in based on their location. For instance, if someone has an 818 area code but you’re not sure which part of California they’re located in – whether it’s Los Angeles or San Fernando Valley – you can check the time difference between your location and theirs to figure it out.
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