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US area code · California

Area code 831

Where the 831 area code is, its overlay and how to dial a +1 831 number from anywhere.

CoversHollister, CaliforniaTime zonePacific (PT)TypeGeographic
Quick answer

The 831 area code is in Hollister, California, United States (Pacific (PT)). To call from abroad: +1 831 555-0123.

StateCalifornia
Main areaHollister
Time zonePacific (PT)
TypeGeographic
10-digit dialingNot required
In service since22-May-1997

The 831 area code is a geographic North American Numbering Plan (NANP) code covering Hollister, California. It has been in service since 22-May-1997 and sits in the Pacific (PT) time zone.

How to dial a 831 number

From abroad+1 831 555-0123
Within the US / Canada1 831 555-0123

Cities in the 831 area code

A 831 number is usually in one of these places in California — 3 counties.

Hollister San BenitoMarina MontereyMonterey MontereySalinas MontereySanta Cruz Santa CruzSeaside MontereyWatsonville Santa Cruz

Other California area codes

209213279310323341350357369408415424442510530559

Frequently asked questions

Where is the 831 area code?

The 831 area code is in Hollister, California, United States (Pacific (PT)).

Do I have to dial 10 digits for 831?

Local calls within 831 may use seven digits; ten-digit dialling always works.

How do I call a 831 number from another country?

Dial your exit code (or +), then 1, then 831, then the number: +1 831 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 831 number does not pinpoint a street or ZIP code.

Missed a call from +1 831?

In the 30 days to September 24, 2026, 314 unwanted calls showing a 831 number were reported to the US Federal Trade Commission, 72% of them recorded messages or robocalls. That puts 831 at #279 of 670 area codes reported.

Reducing your debt (credit cards, mortgage, student loans)125
Other110
Dropped call or no message33
Calls pretending to be government, businesses, or family and friends19
Before you call back
  • If you do not know anyone in California, do not call back: a genuine caller will leave a message or send a text.
  • Scammers fake the number shown on caller ID, so a 831 number can hide a caller anywhere in the world.
  • Never give a code received by text or a bank detail to an unknown caller. In the US, calls can be reported at reportfraud.ftc.gov.

Who issues +1 831 numbers

Phone companies hold blocks of numbers in each area code. The main holders in 831:

Pacific Bell 126New Cingular Wireless PCS, LLC 35Onvoy, LLC 31Cellco Partnership Dba Verizon Wireless 30Level 3 Communications, LLC 26 25

About 17.9% of the 442 prefixes in use belong to mobile carriers: a 831 number is often a cell phone, and it may have moved to another carrier since.

Sources: FTC Do Not Call reported calls (numbers as reported by consumers, not verified), NANPA central office code assignments.

All US area codes United States +1 Map of area code 831 — cities & rate centres