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  2. Area codes 909 and 840 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_909_and_840

    Area code 909 was created on November 14, 1992, in an area code split of 909, and 840 was added to the numbering plan area to form an overlay complex effective February 23, 2021. While most of western Riverside County now uses Area code 951, some residents in Eastvale and Corona were allowed to keep the 909 area code after the split in 2004.

  3. List of California area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_California_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, respectively. [1] As of July 2023, California has 38 active area codes.

  4. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997 was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled

  5. ZIP Code - Wikipedia

    en.wikipedia.org/wiki/ZIP_Code

    A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels. A ZIP Code (an acronym for Zone Improvement Plan [1]) is a system of postal codes used by the United States Postal Service (USPS).

  6. Atherton, California - Wikipedia

    en.wikipedia.org/wiki/Atherton,_California

    Atherton is known for its high concentration of wealth; in 1990 and 2019, [10] Atherton was ranked as having the highest per capita income among U.S. places that have a population between 2,500 and 9,999, [11] and the area covered by its ZIP Code is regularly ranked as having the highest cost of living in the United States.

  7. Area codes 408 and 669 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_408_and_669

    Area codes 408 and 669 are telephone area codes in the North American Numbering Plan (NANP) in the U.S. state of California. The numbering plan area comprises most of Santa Clara County and Northern Santa Cruz County , and includes Gilroy , Morgan Hill , Saratoga , Los Gatos , Monte Sereno , Milpitas , Sunnyvale , Santa Clara , Cupertino ...

  8. Ontario, California - Wikipedia

    en.wikipedia.org/wiki/Ontario,_California

    Ontario is a city in southwestern San Bernardino County in the U.S. state of California, 35 miles (56 km) east of downtown Los Angeles and 23 miles (37 km) west of downtown San Bernardino, the county seat.

  9. Spring Valley, San Diego County, California - Wikipedia

    en.wikipedia.org/wiki/Spring_Valley,_San_Diego...

    The United States Census Bureau places Spring Valley at (32.734318, -116.981372), [5] which is approximately two miles southeast of where the USGS places According to the United States Census Bureau, the CDP has a total area of 7.4 square miles (19 km 2 ). 7.2 square miles (19 km 2 ) of it is land and 0.2 square miles (0.52 km 2 ) of it (2.83% ...