Caller ID for
Area code 831
Area code 831 Salinas, California
Area code 831 is in California, with numbers assigned in Salinas, Santa Cruz, Monterey and 18 more places. It’s 9:14 PM there now.
- State
- California41 area codes in California
- Time zone
- Pacific9:14 PM there now
- Exchanges
- 40621 places
- Overlay
- NoneThe only code for its area
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 831 is
Numbers in 831 are assigned to 21 places in 5 counties: Monterey County, Santa Cruz County, San Benito County, Sacramento County and Alameda County.
Salinas has the most, 21% of the exchanges; the rest are spread across 20 other places.
- Salinas84
- Santa Cruz76
- Monterey64
- Watsonville30
- Hollister22
- Aptos19
- Carmichael12
- Ben Lomond11
- Felton9
- Boulder Creek9
- Soledad8
- Greenfield7
- King City7
- Gonzales7
- Tres Pinos6
- Castro Valley6
- Carmel Valley Village5
- San Ardo4
- Chualar4
- San Juan Bautista4
- San Lucas4
Phone companies in 831
406 blocks of numbers in 831 are held by 41 phone companies. The most belong to AT&T (124), AT&T Mobility (35) and Inteliquent (31).
A large share, about 43%, belongs to competitive and internet phone carriers; wireless networks hold 23% and local phone and cable companies 34%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
831 went into service in 1998, added to the area of 408.
43 new exchanges were assigned since 2021, the latest in September 2026.
Calling 831
It’s 9:14 PM Pacific time in 831 right now.
From elsewhere in the U.S., dial 1, 831 and the 7-digit number.
Nearby area codes
California has 41 area codes: 209, 213, 279, 310, 323, 341, 350, 357, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 738, 747, 760, 805, 818, 820, 831, 837, 840, 858, 909, 916, 925, 949 and 951.
- 669 · San Jose, CA · about 30 mi
- 408 · San Jose, CA · about 31 mi
- 925 · Walnut, CA · about 48 mi
- 650 · Palo Alto, CA · about 54 mi
- 341 · Oakland, CA · about 56 mi
- 510 · Oakland, CA · about 63 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 831 area code
Map of the 831 area code around Salinas, Santa Cruz and Monterey, California.
Cities on the map
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Questions about 831
Where is area code 831?
In California, covering Salinas, Santa Cruz and Monterey and other places across 5 counties.
What time zone is 831 in?
Pacific time. It was 9:14 PM there when this page loaded.
Is 831 an overlay?
No. 831 is the only area code for its area right now.
Which phone companies have 831 numbers?
41 companies hold blocks; the most belong to AT&T, AT&T Mobility and Inteliquent. About 23% of blocks are wireless.
Is 831 running out of numbers?
Not on record. 43 new exchanges have been assigned since 2021.