Area codes in Hollister, California
Hollister, California uses area code 831. The main Hollister area code is 831.
Area codes serving Hollister
All California area codes · Is a Hollister call a scam?
Nearby cities
- Gilroy area codes
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Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.