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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. Area codes are also assigned for non-geographic purposes.
Country calling codes, country dial-in codes, international subscriber dialing ( ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
International access. 011. List of dialing codes. The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1.
This includes all area codes that can also be found in the subcategories. This category lists the telephone area codes in the United States . Area codes in the North American Numbering Plan area may not contain 0 or 1 as the first digit.
United States: North 1 011 1 Several NANP areas; see Telephone numbers in the United States. United States Virgin Islands: Caribbean 1-340: 011 1 Uruguay: South 598: 00 No National Call Prefix needed since 29 August 2010 according to the new numbering plan. All geographical numbers have 8 digits. Venezuela: South 58: 00 0
Forty NPAs were mapped to entire states or provinces. Each NPA was identified by a three-digit area code used as a prefix to each local telephone number. The United States received seventy-seven area codes, and Canada nine.
Numbering plan areas and area codes of Texas with numbering plan area 214/469/972/945 highlighted. Area codes 214, 469, 972, and 945 are telephone area codes in the North American Numbering Plan (NANP) for Dallas, Texas and most of the eastern portion of the Dallas–Fort Worth metroplex.
Area codes 714 and 657 are telephone area codes in the North American Numbering Plan for the southern part of the U.S. state of California. The numbering plan area comprises northern Orange County, a portion of Los Angeles County, and the Sleepy Hollow and Carbon Canyon areas of Chino Hills in San Bernardino County.
Area code 206 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Washington. The numbering plan area (NPA) includes Seattle and most of its innermost suburbs.
Area codes 602, 480, and 623 are telephone area codes in the North American Numbering Plan (NANP) for most of the Phoenix metropolitan area in the U.S. state of Arizona. Area code 602 is the oldest area code in Arizona and was assigned in 1947 for the entire state.