The 209 area code is expected to be depleted of available prefixes by December 2022. On May 19, 2022, the CPUC acted to ensure that phone numbers continue to be available to meet the demand in the geographic region served by the 209 area code. The CPUC issued Decision 22-05-018 and approved a second area code (called an overlay) that will provide additional numbering resources for the 209 area code geographic region. The new area code to overlay the 209 area code is the 350 area code. The overlay will be effective in November 2022. New customers will be assigned telephone numbers from the new 350 area code after all available prefixes in the 209 area code have been depleted.

Additional information:


The 209 area code was created in 1958 when it was split off the 415 area code. In 1997, the 209 area code was split to form the 559 area code. The area served by the 209 area code currently includes Amador, Calaveras, Mariposa, Merced, San Joaquin, Stanislaus, and Tuolumne Counties, and portions of Alameda, Alpine, El Dorado, Fresno, Madera and Sacramento Counties.


Please direct questions concerning telephone numbering and area codes to staff at