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The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.
1993: split to create 905. 2001: overlaid by 647. 2013: overlaid by 437. 2025: overlaid by 942. area code 387 is reserved as a fifth code for the region. 417. Missouri (Springfield, Joplin, Branson, Lamar, Lebanon, and most of southwestern Missouri) 1950. created from parts of the area codes 314 and 816.
Lists of North American area codes. The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.
1. International access. 011. List of dialing codes. The North American Numbering Plan (NANP a/k/a "World Zone 1 – 'WZ1' [1]) 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.
2025 – 4th Qtr [3] April 26, 2025[4][22] NPA boundary changes, overlay expansions, etc. 564. 206. Washington. 2026 – 1st Qtr. April 5, 2025[23] Other area codes that are expected to exhaust by the end of 2027 that do not have an approved relief plan: 352, 502, 520, 603, 714/657, 718/347/929, 765 and 949.
By 1971 the North American network had been prepared for operation with central office codes that permitted the digits 0 and 1 as the middle digit, i.e. with the number format NXX (less N11), where N=2–9, and X=0–9. [4]
Area code 805 is shown in red. Area codes 805 and 820 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of California. The numbering plan area (NPA) includes most or all of the counties of San Luis Obispo, Santa Barbara, Ventura, and the southernmost portions of Monterey County. 805 was split from area code ...
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