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Area codes 909 and 840 are telephone area codes in the North American Numbering Plan. They work for the far-eastern part of Los Angeles County and southwestern San Bernardino County in the U.S. state of California. Area code 909 was created on November 14, 1992 in an area code split of 714. 840 was added to the numbering plan area to form an overlay complex effective February 23, 2021.
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