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04/04/2021 · Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in California. They cover parts of Contra Costa County and western Alameda County , including the city of Oakland , but excluding Dublin , Livermore , Pleasanton , and Sunol .

Area codes 510 and 341 are telephone area codes in the North American Numbering Plan (NANP) serving much of the East Bay in California. They cover parts of Contra Costa County and western Alameda County, including the city of Oakland, but excluding Dublin, Livermore, Pleasanton, and Sunol.

Area Codes / Los códigos de área / Les codes régionaux / Vorwahlen : 209 — 213/323 — 279/916 — 341/510 — 310/424 — 408/660 — 415/828 — 442/760 — 530 — 559 — 562 — 619/858 — 626 — 650 — 657/714 — 661 — 707 — 747/818 — 805 — 840/909 — 831 — 925 — 949 — 951