Complete directory of all 324 active US telephone area codes organized by city and state. Search by city name, state, or area code number. Part of the North American Numbering Plan (NANP) which also covers Canada, Mexico, and the Caribbean.
A US area code is the three-digit prefix that identifies a geographic region within the country. It is dialed before the seven-digit local phone number. Area codes were introduced in 1947 with the creation of the North American Numbering Plan. Today there are 324 active area codes in the United States covering all 50 states, Washington DC, and US territories.