The Area Code Listing by Number table below displays the 300+ dialing codes required when making calls to those in different states and areas throughout the U.S. This is generally not a cause for concern because you won’t have to change your existing number or area code, it will continue to function as normal.Įven if you are calling someone who has the same area code listing as you, you must dial the area code + the telephone number, typically a total of 10-digits. When the population and saturation of phone numbers reach capacity in a specific area an additional 3-digit overlay is added. What this means is that more than one area code will serve a specific state or a certain geographical area within that state. The area code listing by number system is added to the existing area to make sure there is a continual supply of phone numbers in the region. The FCC gives the authority to states when deciding when and how to add and introduce area code listings by number in the US.Īn area code overlay is an addition of another area code to the same geographic area as an existing area code. The United States area codes were created and are monitored by Federal state authorities, the North American Numbering Plan Administrator (NANP), and the FCC have jurisdiction over the telephone number administration. By adding new area codes, millions of new numbers become available for a specific region of a state.

Some US states are assigned to a single area code if their population is not that high, while many US state area codes have been created and added to states that have a much larger population. The state of California has the largest number of US state area codes, 36 of them! Texas has the second most with 27 and Florida has 18 different area codes. If you want to go straight to our complete listing of US State area codes (below), click HERE.

Generally, highly populated states in the US have more than one US state area code to ensure there is a continual supply of phone numbers in the region. Some states use just one area code for the entire state but the majority use different and unique US state area codes for cities, towns, and counties, or specific geographical regions of a US state. There are also 15 other US area codes that aren’t assigned to a specific geographic region. There are more than 315 US state area codes which are all allocated to specific states, towns, and cities throughout the United States.

What state has the phone number 301