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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. The state of California was divided into three numbering plan areas (NPAs) with distinct area codes: 213, 415, and 916, for the southern, central, and northern parts of the state ...
The 469th area code in the NANPA; 925: California (inland regions of the East Bay: Livermore, Concord, Pleasant Hill, Walnut Creek, Martinez, Pleasanton, and Dublin, just east of the hills that ring San Francisco Bay) March 14, 1998: split of 510; 926: not in use; available for geographic assignment 927: not in use; available for geographic ...
The area code was one of the original North American area codes created in 1947, when it was assigned to the entire southwestern corner of the state. [1] On August 17, 2001, the numbering plan area was converted to an overlay complex with area code 878, which also forms an overlay with area code 724, in the surroundings of the 412 service area.
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. Area code 424 was added to the remaining numbering plan area on July 26, 2006, in an overlay plan , the first in California.
0–9. Area codes 209 and 350; Area codes 213, 323, and 738; Area codes 310 and 424; Area codes 408 and 669; Area codes 415 and 628; Area codes 510 and 341
On March 1, 1959, area code 707 was created from the northern part, and area code 408 was created for San Jose, the South Bay, the Monterey Bay, and the Salinas Valley. [5] (408 has since been split to 831 and overlaid with 669. 707 has since been overlaid with 369.) On September 2, 1991, area code 510 was created for the East Bay, including ...
Though school hours in California might range from about 7 a.m. to 4 p.m., Olsen said drivers should still be cautious when passing by a school zone because after-school programs can last until 6 p.m.
The area code split became effictive on July 11, 1998, with a permissive dialing period ending on February 20, 1999. [3] Months later, by late 1998, continued growth in telecommunication services in Northern California required further area code relief for the 408 numbering plan area.