Hollister, CA is currently using one area code which is area code 831. Area code 831 was placed in service on July 11, 1998 and was created from a split of area code 408.
In addition to Hollister, CA area code 831 serves an area on the west coast of northern California which covers portions of Monterey County, San Benito County, and Santa Cruz County including the larger cities and communities of Hollister, Marina, Monterey, Salinas, Santa Cruz, Seaside, and Watsonville in addition to many smaller communities within the service area.
Hollister, CA is located in San Benito County and observes the Pacific Time Zone. View our Times by Area Code tool.