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Clickable map of Arizona area codes in blue (and border states) The U.S. state of Arizona is served by five telephone area codes in three numbering plan areas: Area codes 602, 480, and 623 serve the Phoenix metropolitan area. The three area codes were recombined in 2023 into an overlay complex after a 1999 split:
California (Daly City, South San Francisco, Palo Alto, Redwood City, Menlo Park, Mountain View, San Mateo, Santa Clara) August 2, 1997: split of 415; 651: Minnesota (St. Paul, Eagan, Lindstrom, Red Wing, Hastings, Stillwater, and a part of east-central Minnesota) July 12, 1998: split of 612; 652–654: not in use; available for geographic ...
On August 2, 1997, area code 650 was created; the partition approximately followed the boundary between San Francisco, which (along with Marin County) kept 415, and San Mateo County to the south, which received the new code.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
The additional demands for PCS and cellular phone numbers helped necessitate the 831/408 area code split, the 650/415 split, and the earlier 510/415 split. Part of the previous dialing plan included a mass calling prefix for radio station contests, introduced in the 1960s because some contests put unacceptable loads on the Bay Area's telephone ...
The area codes serve part of the northern San Francisco Bay Area, as well as the North Coast. Major cities in the area codes include Napa , Sebastopol , Vallejo , Benicia , Fairfield , Santa Rosa , Windsor , Healdsburg , Rohnert Park , Petaluma , Fort Bragg , Rio Vista , Crescent City , Eureka , Clearlake , Vacaville , Dixon , and Ukiah . 707 ...
For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 314 159-2653 is invalid, because the office code must not begin with 1.
Area code 650 is a telephone area code in the North American Numbering Plan (NANP) for the San Francisco Bay Area in the U.S. state of California. It was split from area code 415 on August 2, 1997, and includes most of San Mateo County (except the northernmost portion), part of San Francisco , and the northwestern portion of Santa Clara County ...