Area codes 510 and 341

Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in the U.S. state of California. The numbering plan area (NPA) includes parts of Contra Costa County and western Alameda County, including the city of Oakland, but excludes Dublin, Livermore, Pleasanton, and Sunol. Area code 510 was established in 1991 in a split of area code 415, and 341 was added to the numbering plan area in 2019.

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