Area code 831

In 1997, the California/Nevada Code Administrator (C/NCA) advised the North American Numbering Plan Administration (NANPA) of the need for area code relief in the 408 numbering plan area.

Area code 408 would be retained in Sunnyvale, San Jose, Los Gatos, and Gilroy.

The area code split became effictive on July 11, 1998, with a permissive dialing period ending on February 20, 1999.

[4] The service area of NPA 831 includes Big Sur, Monterey Bay, the Salinas Valley, and the southwestern Santa Cruz Mountains.

Major cities in the area are Salinas, Hollister, Monterey, Santa Cruz and places in the northern Central Coast.

458/541 775 702 928 442/760 916/279 530 707 209 559 831 805 661 858 909 951 619 213 323 707 916/279 415 650 510/341 925 408 209 831 805 661 442/760 310/424 747/818 626 909 951 949 562 657/714
Numbering plan areas in California (blue) and border states. This map is clickable; click on any region shown to visit the page for those area codes.Area code 831 is shown in red.