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Area code 310 was created in a split from area code 213 on November 2, 1991. On January 25, 1997, area code 310 was split, creating area code 562 for the southeast portion of Los Angeles County and a large portion of Orange County.
If this map is the primary area code map of California (master map), no area code appears in red. Map is correct as of 2023-07-02. To make changes, updates, and replacing the lesser maps (the ones for a specific area code block), this file uses CSS to define the colors for each region.
Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes. In 1947, the American Telephone and Telegraph Company (AT&T) devised the first nationwide telephone numbering plan and assigned the original North American area codes.
310: California (southwestern coastal and coastal-adjacent areas of Los Angeles County, ... area code 387 is reserved as a fifth code for the region; 648:
In relief the numbering plan area was divided with several new area codes, including area code 818 and area code 310. Area code 818 entered service on January 7, 1984, [1] making Los Angeles one of the first major cities to be split among multiple area codes. Area code 626 was assigned to a portion of the eastern part on June 14, 1997.
Area code 213 was one of the original North American area codes of 1947 and 323 was created in an area code split of 213 in 1998. This was the fifth split of 213 and left it serving only downtown Los Angeles and immediately adjoining neighborhoods.
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When the original North American area codes were introduced for a nationwide telephone numbering plan in 1947, the entire state was a single numbering plan area (NPA) with area code 305. In 1953, area code 813 was introduced for the western coast of Florida, and 904 was assigned for northern Florida in 1965. In 1988, area code 407 was ...