Area Code 831: Monterey, California
831 is a telephone area code serving California, including Monterey, Santa Cruz. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 831 are located in California, United States (NANP region: Central Coast). The code covers Monterey, Santa Cruz.
How to Dial Area Code 831
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 831 XXX-XXXX (10-digit dialing: 831 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 831 XXX XXXX |
| From Australia | 0011 1 831 XXX XXXX |
| From a mobile phone anywhere | +1 831 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 831 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 831
Calls to a 831 number ring in the America/Los_Angeles time zone, standard offset UTC-08:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Cities and Communities Served by 831
The following places fall inside the 831 calling area:
Other Area Codes in California
These codes also serve California. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 209 | Stockton, Modesto |
| 213 | Los Angeles (downtown) |
| 279 | Sacramento (overlay) |
| 310 | Los Angeles Westside, Santa Monica |
| 323 | Los Angeles (central) |
| 341 | Oakland (overlay) |
| 350 | Stockton (overlay) |
| 369 | North Bay (overlay for 707) |
| 408 | San Jose, Silicon Valley |
| 415 | San Francisco |
| 424 | LA Westside (overlay) |
| 442 | Palm Springs (overlay) |
| 510 | Oakland, Berkeley |
| 530 | Redding, Chico |
See all 38 area codes in California →
Frequently Asked Questions
Where is area code 831?
Area code 831 is in California, United States. It covers Monterey, Santa Cruz.
What time zone is area code 831 in?
Area code 831 rings in the America/Los_Angeles time zone (UTC-08:00 standard).
Do I need to dial 1 before area code 831?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 831, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 831.
Is area code 831 toll-free?
No. 831 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.