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831 Area Code

Area code 831 serves Salinas, Santa Cruz, Watsonville, Hollister, Seaside and nearby communities in California. It has been in service since July 11, 1998, when it was split from 408.

StateCalifornia
Time zonePacific
Local time now…
Prefixes in use409
Projected to run out2078
SalinasSanta CruzWatsonvilleHollisterSeasideMontereySoledadMarinaGreenfieldPacific GroveKing CityScotts ValleyRio del MarGonzalesInterlakenCastrovilleBen LomondAptosBoulder CreekSalinasSanta CruzWatsonvilleHollisterSoledadGreenfield
Cities and towns served by area code 831

Who issues 831 numbers

Mobile 19%VoIP and cable 29%Landline 51%

Share of the 409 prefixes (the three digits after 831) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Pacific Bell)126
AT&T Mobility35
Onvoy (Sinch)35
Verizon Wireless30
Lumen (Level 3)29
Ip Horizon14
T-Mobile13
Metropcs13

Cities and towns in area code 831

CityPopulationOther area codes
Salinas159,134408
Santa Cruz61,797
Watsonville50,716
Hollister45,695
Seaside31,636
Monterey28,953
Soledad26,357
Marina23,256
Greenfield21,138
Pacific Grove14,659
King City14,002
Scotts Valley11,652
Rio del Mar8,938
Gonzales8,313
Interlaken8,191
Castroville6,870
Ben Lomond6,849
Aptos6,124
Boulder Creek5,353

Got a call from 831?

A 831 number was originally issued in California, but that does not prove the caller is there. 29% of 831 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 409 prefixes in area code 831

Format: (831) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 831

Where is area code 831?
Area code 831 is in California. It covers Salinas, Santa Cruz, Watsonville, Hollister, Seaside, Monterey and 13 more cities and towns.
What time zone is area code 831?
Area code 831 is in the Pacific time zone.
Is 831 a toll-free number?
No. 831 is a geographic area code in California. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 831 run out of numbers?
NANPA's latest forecast projects area code 831 to exhaust in the second quarter of 2078. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in California