831 Area Code: Location, Cities, Map And Time Zone

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Area code 831 is in California, USA , spanning 3 counties and serving 40 cities , including Salinas, Santa Cruz or Watsonville; it currently uses 401 prefixes , assigned from 831-200-XXXX through 831-999-XXXX.

In service date for area code 831: July 11, 1998.

The current local time is .

831 area code location on a map
© OpenStreetMap contributorsFor exact NPA boundaries see official 831 area code map

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More California area codes:

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  • 916
  • 925
  • 949
  • 951

Locate any 831-NXX prefix:

831-200-XXXX --- 831-299-XXXX
NPANXX Carrier1 Area Served2 Date3
831-200 Peerless Network Of California Monterey 11/26/2014
831-201 New Cingular Wireless PCS Santa Cruz 9/7/2016
831-202 MCIMetro Access Transmission Services Salinas 3/30/2018
831-203 Nuso Salinas 08/10/2023
831-204 Onvoy Monterey N/A
831-205 Teleport Communications America Hollister 10/8/2009
831-206 Cellco Partnership Salinas N/A
831-207 T-Mobile USA Hollister 9/12/2001
831-208 Cellco Partnership Salinas 3/20/2019
831-210 T-Mobile USA Salinas 1/16/2002
831-212 MetroPCS Santa Cruz N/A
831-214 New Cingular Wireless PCS Salinas N/A
831-215 HD Carrier Monterey 10/2/2020
831-216 Teleport Communications America Felton N/A
831-217 Teleport Communications America Boulder Creek N/A
831-218 Teleport Communications America Ben Lomond N/A
831-219 Teleport Communications America Aptos N/A
831-220 Vonage America Monterey 5/31/2018
831-221 Ip Horizon San Ardo N/A
831-222 U.S. Telepacific Corp. Felton N/A
831-223 Level 3 Communications Soledad N/A
831-224 T-Mobile USA Monterey 12/14/2001
831-225 Centurylink Communications Salinas 6/23/2015
831-226 AT&T Enterprises Santa Cruz 7/16/2015
831-227 Cellco Partnership Santa Cruz N/A
831-228 Charter Fiberlink Ca-Cco Watsonville 9/21/2015
831-229 New Cingular Wireless PCS Salinas N/A
831-230 Telnyx Monterey 12/15/2016
831-231 Onvoy Spectrum Greenfield 5/3/2019
831-232 Ip Horizon Chualar N/A
831-233 Level 3 Communications Monterey N/A
831-234 Cellco Partnership Santa Cruz N/A
831-235 Cellco Partnership Salinas N/A
831-236 Cellco Partnership Monterey N/A
831-237 Ip Horizon Soledad N/A
831-238 New Cingular Wireless PCS Carmel N/A
831-239 New Cingular Wireless PCS Santa Cruz N/A
831-240 T-Mobile USA Salinas N/A
831-241 AT&T Monterey N/A
831-242 Pacific Bell Monterey N/A
831-243 Csc Wireless Salinas 6/29/2020
831-244 Bandwidth.com Clec Big Sur N/A
831-245 Cellco Partnership Hollister N/A
831-246 Cellco Partnership Ben Lomond N/A
831-247 Cellco Partnership Santa Cruz N/A
831-249 AT&T Enterprises Big Sur 12/14/2009
831-250 Ip Horizon Carmel N/A
831-251 New Cingular Wireless PCS Aptos N/A
831-252 New Cingular Wireless PCS Ben Lomond N/A
831-253 U.S. Telepacific Corp. Salinas 12/4/2020
831-254 New Cingular Wireless PCS Watsonville N/A
831-255 North County Communication Corporation Santa Cruz N/A
831-256 Cellco Partnership Salinas 4/10/2015
831-257 Onvoy Aptos 10/7/2016
831-258 New Cingular Wireless PCS Salinas 7/8/2016
831-259 U.S. Telepacific Corp. Monterey 6/10/2022
831-260 New Cingular Wireless PCS Soledad 3/15/2022
831-261 New Cingular Wireless PCS Salinas N/A
831-262 Cellco Partnership Salinas N/A
831-263 Ip Horizon King City N/A
831-264 Bandwidth.com Clec Monterey N/A
831-265 AT&T Enterprises Hollister 4/2/2008
831-266 T-Mobile USA Santa Cruz 3/24/2021
831-267 U.S. Telepacific Corp. Big Sur 12/14/2006
831-268 Onvoy Felton 7/15/2016
831-269 Teleport Communications America Salinas 6/21/2007
831-270 U.S. Telepacific Corp. Salinas 6/10/2022
831-271 Telnyx Hollister 6/23/2021
831-272 Onvoy Salinas N/A
831-273 Onvoy Salinas 4/6/2017
831-274 Level 3 Communications Watsonville N/A
831-275 Bandwidth.com Clec Monterey 10/23/2008
831-276 Telnyx Salinas N/A
831-277 Cellco Partnership Monterey N/A
831-278 Cellco Partnership Ben Lomond N/A
831-279 Dish Wireless Salinas 05/10/2023
831-280 Commio Aptos 08/11/2023
831-281 Cellco Partnership Santa Cruz N/A
831-282 Ip Horizon Monterey 9/17/2021
831-283 Commio Carmel Valley 11/4/2022
831-284 New Cingular Wireless PCS Watsonville 08/28/2023
831-285 Bandwidth.com Clec Watsonville 10/28/2022
831-286 Onvoy Greenfield 03/21/2024
831-287 Bandwidth.com Clec Salinas 12/16/2008
831-288 Charter Fiberlink Ca-Cco Watsonville 6/11/2009
831-289 Comcast IP Phone Ben Lomond 9/20/2022
831-290 U.S. Telepacific Corp. Gonzales 6/26/2009
831-291 Cellco Partnership Santa Cruz 4/7/2014
831-292 New Cingular Wireless PCS Soledad 1/8/2019
831-293 Level 3 Communications Carmel 6/25/2008
831-294 New Cingular Wireless PCS Salinas 03/25/2024
831-295 T-Mobile USA Santa Cruz 12/14/2001
831-296 Level 3 Communications Salinas 7/12/2010
831-297 T-Mobile USA Hollister 12/14/2001
831-298 Onvoy Carmel Valley N/A
831-299 Level 3 Communications Tres Pinos N/A
831-300-XXXX --- 831-394-XXXX
NPANXX Carrier1 Area Served2 Date3
831-300 Level 3 Communications Big Sur N/A
831-301 Peerless Network Of California San Juan N/A
831-302 Level 3 Communications San Lucas N/A
831-303 Peerless Network Of California San Ardo N/A
831-304 Peerless Network Of California Greenfield N/A
831-305 Level 3 Communications Gonzales N/A
831-306 Level 3 Communications Chualar N/A
831-307 Level 3 Communications Castroville N/A
831-308 Bandwidth.com Clec Carmel Valley N/A
831-309 Bandwidth.com Clec Carmel 5/8/2017
831-312 Cebridge Telecom Ca Monterey 03/26/2024
831-313 Charter Fiberlink Ca-Cco Hollister 6/11/2009
831-314 Shelcomm Santa Cruz 09/12/2024
831-315 Peerless Network Of California Soledad 2/15/2016
831-316 MCIMetro Access Transmission Services Santa Cruz N/A
831-317 Leap Telecom Monterey 09/23/2024
831-318 Onvoy Aptos 3/17/2016
831-319 MCIMetro Access Transmission Services Watsonville 4/17/2001
831-320 Cellco Partnership Salinas N/A
831-321 New Cingular Wireless PCS Salinas 12/06/2024
831-322 Onvoy Watsonville 3/17/2016
831-324 Comcast IP Phone Monterey N/A
831-325 MetroPCS Santa Cruz 4/25/2001
831-326 New Cingular Wireless PCS Salinas 12/06/2024
831-327 New Cingular Wireless PCS Hollister 12/30/2024
831-328 Onvoy Salinas 03/13/2025
831-329 Nuso Salinas 04/21/2025
831-330 Onvoy Spectrum Carmel 12/06/2023
831-331 New Cingular Wireless PCS Santa Cruz N/A
831-332 New Cingular Wireless PCS Santa Cruz N/A
831-333 Pacific Bell Monterey N/A
831-334 New Cingular Wireless PCS Santa Cruz N/A
831-335 Pacific Bell Felton N/A
831-336 Pacific Bell Ben Lomond N/A
831-337 MCIMetro Access Transmission Services Boulder Creek N/A
831-338 Pacific Bell Boulder Creek N/A
831-339 New Cingular Wireless PCS Gonzales 09/04/2025
831-345 Cellco Partnership Santa Cruz 11/13/2001
831-346 T-Mobile USA Santa Cruz 9/23/2014
831-348 Fractel Watsonville 3/20/2019
831-350 Level 3 Communications Tres Pinos 5/11/2006
831-353 Onvoy Watsonville 7/18/2016
831-356 Fractel Salinas 12/2/2019
831-359 Level 3 Communications Santa Cruz N/A
831-366 Ton80 Communications Boulder Creek 2/23/2022
831-372 Pacific Bell Monterey N/A
831-373 Pacific Bell Monterey N/A
831-375 Pacific Bell Monterey N/A
831-382 Pacific Bell San Lucas N/A
831-383 MetroPCS Monterey 9/13/2001
831-384 Pacific Bell Monterey N/A
831-385 Pacific Bell King City N/A
831-386 Pacific Bell King City N/A
831-387 Bandwidth.com Clec King City N/A
831-388 Onvoy Greenfield 9/8/2022
831-389 Pinnacles Tel. Co. Pinnacles N/A
831-392 Pacific Bell Monterey N/A
831-393 Pacific Bell Monterey N/A
831-394 Pacific Bell Monterey N/A
831-400-XXXX --- 831-498-XXXX
NPANXX Carrier1 Area Served2 Date3
831-400 Voip Innovations Santa Cruz N/A
831-401 Level 3 Communications Ben Lomond N/A
831-402 New Cingular Wireless PCS Monterey 11/13/2001
831-406 T-Mobile USA Watsonville 12/14/2001
831-417 Onvoy Salinas N/A
831-419 New Cingular Wireless PCS Santa Cruz N/A
831-420 Pacific Bell Santa Cruz N/A
831-421 Pacific Bell Santa Cruz N/A
831-422 Pacific Bell Salinas N/A
831-423 Pacific Bell Santa Cruz N/A
831-424 Pacific Bell Salinas N/A
831-425 Pacific Bell Santa Cruz N/A
831-426 Pacific Bell Santa Cruz N/A
831-427 Pacific Bell Santa Cruz N/A
831-428 MetroPCS Santa Cruz N/A
831-429 Pacific Bell Santa Cruz N/A
831-430 Pacific Bell Santa Cruz N/A
831-431 Pacific Bell Santa Cruz N/A
831-432 Fractel Boulder Creek 12/21/2020
831-435 Pacific Bell Santa Cruz N/A
831-438 Pacific Bell Santa Cruz N/A
831-439 Pacific Bell Santa Cruz N/A
831-440 Pacific Bell Santa Cruz N/A
831-442 Pacific Bell Salinas N/A
831-443 Pacific Bell Salinas N/A
831-444 Pacific Bell Salinas N/A
831-449 Pacific Bell Salinas N/A
831-453 AT&T Enterprises Castroville 1/25/2011
831-454 Pacific Bell Santa Cruz N/A
831-455 Pacific Bell Salinas N/A
831-457 Pacific Bell Santa Cruz N/A
831-458 Pacific Bell Santa Cruz N/A
831-459 Pacific Bell Santa Cruz N/A
831-460 Pacific Bell Santa Cruz N/A
831-461 Pacific Bell Santa Cruz N/A
831-462 Pacific Bell Santa Cruz N/A
831-464 Pacific Bell Santa Cruz N/A
831-465 Pacific Bell Santa Cruz N/A
831-466 Pacific Bell Santa Cruz N/A
831-469 Pacific Bell Santa Cruz N/A
831-471 Pacific Bell Santa Cruz N/A
831-475 Pacific Bell Santa Cruz N/A
831-476 Pacific Bell Santa Cruz N/A
831-477 Pacific Bell Santa Cruz N/A
831-479 Pacific Bell Santa Cruz N/A
831-480 Onvoy Santa Cruz N/A
831-484 Pacific Bell Salinas N/A
831-498 Ip Horizon Watsonville N/A
831-500-XXXX --- 831-597-XXXX
NPANXX Carrier1 Area Served2 Date3
831-500 MetroPCS Salinas N/A
831-502 Pacific Bell Santa Cruz N/A
831-508 Ip Horizon Felton N/A
831-512 T-Mobile USA Salinas N/A
831-515 U.S. Telepacific Corp. Santa Cruz N/A
831-521 New Cingular Wireless PCS Monterey N/A
831-524 New Cingular Wireless PCS Hollister N/A
831-525 Level 3 Communications King City N/A
831-529 Fractel Santa Cruz 3/27/2020
831-531 MCIMetro Access Transmission Services Aptos N/A
831-532 Onvoy Ben Lomond N/A
831-533 MCIMetro Access Transmission Services Boulder Creek N/A
831-534 MCIMetro Access Transmission Services Felton N/A
831-535 MCIMetro Access Transmission Services Santa Cruz N/A
831-536 MCIMetro Access Transmission Services Watsonville N/A
831-537 Cellco Partnership Hollister N/A
831-539 T-Mobile USA Watsonville N/A
831-540 Cellco Partnership Salinas N/A
831-566 Cellco Partnership Santa Cruz 6/14/2002
831-572 Utility Telecom Group Aptos N/A
831-574 U.S. Telepacific Corp. Carmel N/A
831-576 Onvoy Santa Cruz N/A
831-578 New Cingular Wireless PCS Salinas N/A
831-580 Ip Horizon Gonzales 5/1/2001
831-582 Pacific Bell Monterey N/A
831-583 Pacific Bell Monterey N/A
831-585 MetroPCS Salinas 2/18/2005
831-586 Ip Horizon San Juan 5/1/2001
831-587 Fractel Watsonville 8/23/2021
831-588 Cellco Partnership Santa Cruz N/A
831-593 Charter Fiberlink Ca-Cco San Juan N/A
831-594 New Cingular Wireless PCS Salinas N/A
831-595 New Cingular Wireless PCS Salinas N/A
831-596 New Cingular Wireless PCS Salinas N/A
831-597 Peerless Network Of California Salinas N/A
831-600-XXXX --- 831-699-XXXX
NPANXX Carrier1 Area Served2 Date3
831-600 U.S. Telepacific Corp. Santa Cruz N/A
831-601 Cellco Partnership Monterey N/A
831-603 Onvoy Aptos N/A
831-604 Onvoy Ben Lomond N/A
831-607 Ip Horizon Aptos N/A
831-609 Onvoy Ben Lomond N/A
831-610 Onvoy Boulder Creek N/A
831-612 Level 3 Communications Aptos N/A
831-613 Bandwidth.com Clec Greenfield N/A
831-618 Onvoy Boulder Creek N/A
831-620 Pacific Bell Carmel N/A
831-621 Level 3 Communications Santa Cruz N/A
831-622 Pacific Bell Carmel N/A
831-623 Pacific Bell San Juan N/A
831-624 Pacific Bell Carmel N/A
831-625 Pacific Bell Carmel N/A
831-626 Pacific Bell Carmel N/A
831-627 Pacific Bell San Ardo N/A
831-628 Pacific Bell Tres Pinos N/A
831-630 Pacific Bell Hollister N/A
831-632 Pacific Bell Castroville N/A
831-633 Pacific Bell Castroville N/A
831-634 Pacific Bell Hollister N/A
831-635 Pacific Bell Hollister N/A
831-636 Pacific Bell Hollister N/A
831-637 Pacific Bell Hollister N/A
831-638 Pacific Bell Hollister N/A
831-641 Pacific Bell Monterey N/A
831-642 Pacific Bell Monterey N/A
831-643 Pacific Bell Monterey N/A
831-644 Pacific Bell Monterey N/A
831-645 Pacific Bell Monterey N/A
831-646 Pacific Bell Monterey N/A
831-647 Pacific Bell Monterey N/A
831-648 Pacific Bell Monterey N/A
831-649 Pacific Bell Monterey N/A
831-652 Level 3 Communications Carmel Valley N/A
831-653 Ip Horizon San Lucas 5/1/2001
831-655 Pacific Bell Monterey N/A
831-656 Pacific Bell Monterey N/A
831-657 Pacific Bell Monterey N/A
831-658 Pacific Bell Monterey N/A
831-659 Pacific Bell Carmel Valley N/A
831-661 Pacific Bell Aptos N/A
831-662 Pacific Bell Aptos N/A
831-663 Pacific Bell Salinas N/A
831-664 Level 3 Communications Hollister N/A
831-665 Level 3 Communications Hollister N/A
831-666 Onvoy Watsonville N/A
831-667 Pacific Bell Big Sur N/A
831-673 New Cingular Wireless PCS Hollister N/A
831-674 Pacific Bell Greenfield N/A
831-675 Pacific Bell Gonzales N/A
831-676 AT&T Salinas 8/30/2002
831-677 Matrix Telecom Soledad N/A
831-678 Pacific Bell Soledad N/A
831-679 Pacific Bell Chualar N/A
831-682 Cellco Partnership Salinas 3/9/2001
831-684 Pacific Bell Aptos N/A
831-685 Pacific Bell Aptos N/A
831-687 Pacific Bell Aptos N/A
831-688 Pacific Bell Aptos N/A
831-689 Pacific Bell Aptos N/A
831-693 Pinnacles Tel. Co. Idria N/A
831-699 Fractel Felton 12/21/2020
831-703-XXXX --- 831-796-XXXX
NPANXX Carrier1 Area Served2 Date3
831-703 Level 3 Telecom Of California Boulder Creek N/A
831-704 Onvoy Felton N/A
831-705 U.S. Telepacific Corp. Chualar 3/13/2002
831-706 Level 3 Telecom Of California Santa Cruz N/A
831-707 Level 3 Telecom Of California Watsonville N/A
831-708 Bandwidth.com Clec Aptos N/A
831-709 Level 3 Communications Ben Lomond N/A
831-710 New Cingular Wireless PCS Salinas 4/12/2002
831-713 Cellco Partnership Santa Cruz N/A
831-717 Twilio International Monterey N/A
831-718 MCIMetro Access Transmission Services Monterey 8/16/2005
831-722 Pacific Bell Watsonville N/A
831-724 Pacific Bell Watsonville N/A
831-726 Pacific Bell Watsonville N/A
831-728 Pacific Bell Watsonville N/A
831-731 Ip Horizon Castroville 5/1/2001
831-732 Level 3 Communications San Ardo N/A
831-737 U.S. Telepacific Corp. Salinas 3/28/2006
831-740 Teleport Communications America Watsonville N/A
831-741 Level 3 Communications Castroville N/A
831-744 Cellco Partnership Gonzales N/A
831-747 AT&T Enterprises Monterey 4/6/2005
831-750 T-Mobile USA Watsonville N/A
831-751 Pacific Bell Salinas N/A
831-753 Pacific Bell Salinas N/A
831-754 Pacific Bell Salinas N/A
831-755 Pacific Bell Salinas N/A
831-756 Utility Telecom Group Salinas 9/12/2005
831-757 Pacific Bell Salinas N/A
831-758 Pacific Bell Salinas N/A
831-759 Pacific Bell Salinas N/A
831-760 MetroPCS Monterey N/A
831-761 Pacific Bell Watsonville N/A
831-763 Pacific Bell Watsonville N/A
831-768 Pacific Bell Watsonville N/A
831-769 Pacific Bell Salinas N/A
831-770 Pacific Bell Salinas N/A
831-771 Pacific Bell Salinas N/A
831-772 Pacific Bell Salinas N/A
831-774 MetroPCS Gonzales 4/27/2005
831-775 Pacific Bell Salinas N/A
831-776 MetroPCS Salinas 7/12/2001
831-777 Onvoy Santa Cruz 8/17/2015
831-778 Level 3 Communications San Lucas N/A
831-783 Pacific Bell Salinas N/A
831-784 Pacific Bell Salinas N/A
831-785 MetroPCS Salinas N/A
831-786 Pacific Bell Watsonville N/A
831-788 Fractel Salinas 5/31/2022
831-789 Matrix Telecom Salinas N/A
831-794 MetroPCS Salinas 9/13/2001
831-796 Pacific Bell Salinas N/A
831-800-XXXX --- 831-899-XXXX
NPANXX Carrier1 Area Served2 Date3
831-800 Skye Telecom Salinas 10/15/2010
831-801 Cellco Partnership Hollister N/A
831-808 Onvoy Spectrum Soledad 12/06/2023
831-809 Cellco Partnership Salinas N/A
831-818 Cellco Partnership Santa Cruz N/A
831-821 Cellco Partnership Tres Pinos N/A
831-824 Teleport Communications America Santa Cruz N/A
831-830 Onvoy King City 7/24/2020
831-833 Commio Hollister 2/24/2022
831-837 Ton80 Communications Salinas 1/10/2022
831-840 New Cingular Wireless PCS Watsonville N/A
831-842 Fractel Aptos 11/21/2021
831-844 Ton80 Communications Big Sur N/A
831-850 Onvoy Felton N/A
831-851 Onvoy Watsonville N/A
831-854 Matrix Telecom Santa Cruz N/A
831-855 Peerless Network Of California Monterey N/A
831-856 Bandwidth.com Clec Greenfield 5/1/2001
831-859 HD Carrier Salinas 06/20/2024
831-867 Commio Monterey 3/24/2017
831-869 MetroPCS Monterey 7/12/2001
831-877 Fractel Carmel 3/20/2019
831-881 Wide Voice Monterey 10/30/2025
831-883 Pacific Bell Monterey N/A
831-884 Pacific Bell Monterey N/A
831-886 Nuso Monterey N/A
831-887 Terra Nova Telecom Monterey N/A
831-888 Onvoy Santa Cruz N/A
831-889 Utility Telecom Group Santa Cruz 6/27/2018
831-899 Pacific Bell Monterey N/A
831-900-XXXX --- 831-999-XXXX
NPANXX Carrier1 Area Served2 Date3
831-900 Onvoy Santa Cruz N/A
831-901 Wavenation Monterey N/A
831-902 MetroPCS Hollister N/A
831-905 New Cingular Wireless PCS Salinas N/A
831-915 New Cingular Wireless PCS Monterey N/A
831-917 New Cingular Wireless PCS Monterey N/A
831-920 Level 3 Communications Monterey 6/3/2005
831-921 Level 3 Communications Tres Pinos N/A
831-931 Onvoy Spectrum King City 12/06/2023
831-946 Fractel Santa Cruz 7/13/2021
831-948 Utility Telecom Group Watsonville 4/3/2015
831-970 T-Mobile USA Salinas N/A
831-975 Comcast IP Phone Salinas N/A
831-996 Ip Horizon Tres Pinos 5/1/2001
831-998 MCIMetro Access Transmission Services Salinas 7/17/2003
831-999 Peerless Network Of California Santa Cruz 4/6/2016
  1. NPA-NXX assigned carrier; with Number Pooling thousand block numbers are often assigned to other carriers as well; moreover, phone numbers can be ported between service providers
  2. For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
  3. Assignment date. N/A - mostly central office codes assigned before 2001.
  4. NXX prefixes last updated: November 22, 2025

Cities in area code 831

City1 County Time Zone1
Aptos Santa Cruz P
Aromas Monterey P
Ben Lomond Santa Cruz P
Big Sur Monterey P
Boulder Creek Santa Cruz P
Brookdale Santa Cruz P
Capitola Santa Cruz P
Carmel Monterey P
Carmel Valley Monterey P
Carmel-by-the-Sea Monterey P
Castroville Monterey P
Chualar Monterey P
Davenport Santa Cruz P
Felton Santa Cruz P
Freedom Santa Cruz P
Gonzales Monterey P
Greenfield Monterey P
Hollister San Benito P
Jolon Monterey P
King City Monterey P
Lockwood Monterey P
Marina Monterey P
Monterey Monterey P
Moss Landing Monterey P
Mount Hermon Santa Cruz P
Pacific Grove Monterey P
Paicines San Benito P
Pebble Beach Monterey P
Salinas Monterey P
San Ardo Monterey P
San Juan Bautista San Benito P
San Lucas Monterey P
Santa Cruz Santa Cruz P
Scotts Valley Santa Cruz P
Seaside Monterey P
Soledad Monterey P
Soquel Santa Cruz P
Spreckels Monterey P
Tres Pinos San Benito P
Watsonville Santa Cruz P
  1. Listed above are most places served by USA area code 831. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. P stands for Pacific Time (currently ).
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