California, United States
Pacific Time
6:42 PM
Area Code
831
State / Province
California
Country
United States
Time Zone
Pacific Time
Area code 831 covers 24 cities and communities across California, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+18315550100">+18315550100</a><a href="tel:+18315550199">+18315550199</a>Look up which exchange in California a specific 831 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
407 active prefixes in this area code, assigned as 3,259 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–100 of 3,259
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 831-200 | 0 | Monterey | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | MONTEREY | 736 | — | — |
| 831-200 | 1 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-200 | 2 | Monterey | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | MONTEREY | 736 | — | — |
| 831-200 | 3 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-200 | 4 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-200 | 5 | Monterey | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-200 | 6 | Monterey | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-200 | 7 | Monterey | Landline or VoIP | CENTURYLINK COMMUNICATIONS, LLC (508J) | SLNSCA01X7Y | 736 | — | — |
| 831-200 | 8 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-200 | 9 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-200 | A | Monterey | Landline or VoIP | PEERLESS NETWORK OF CALIFORNIA, LLC - CA (373F) | MONTEREY | 736 | — | — |
| 831-201 | 0 | Santa Cruz | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 831-201 | 1 | Santa Cruz | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 831-201 | 2 | Santa Cruz | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | HYWRCAMCDMD | 722 | — | — |
| 831-201 | 3 | Santa Cruz | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | HYWRCAMCDMD | 722 | — | — |
| 831-201 | 4 | Santa Cruz | Landline or VoIP | COMCAST PHONE OF CALIFORNIA, LLC (394L) | OKLDCA03XOY | 722 | — | — |
| 831-201 | 5 | Santa Cruz | Landline or VoIP | ONVOY, LLC - CA (649C) | SAN FRANCISCO | 722 | — | — |
| 831-201 | 6 | Santa Cruz | Landline or VoIP | TELNYX LLC (073H) | SNJUCACL3MD | 722 | — | — |
| 831-201 | 7 | Santa Cruz | Landline or VoIP | METROPCS, INC. (5562) | OKLECAZV1MD | 722 | — | — |
| 831-201 | 8 | Santa Cruz | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 831-201 | 9 | Santa Cruz | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 831-201 | A | Santa Cruz | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SANTA CLARA | 722 | — | — |
| 831-202 | 0 | Salinas | Landline or VoIP | COMCAST PHONE OF CALIFORNIA, LLC (394L) | SLNSCA01XHY | 736 | — | — |
| 831-202 | 1 | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-202 | 2 | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-202 | 3 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-202 | 4 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-202 | 5 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-202 | 6 | Salinas | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - CA (7145) | SLNSCA01X1Y | 736 | — | — |
| 831-202 | 7 | Salinas | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-202 | 8 | Salinas | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-202 | 9 | Salinas | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | SLNSCA01X6X | 736 | — | — |
| 831-202 | A | Salinas | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | SLNSCA01X6X | 736 | — | — |
| 831-203 | 0 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-203 | 1 | Salinas | Landline or VoIP | NUSO, LLC (732J) | SLNTCAPS5MD | 736 | — | — |
| 831-203 | 2 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-203 | 3 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-203 | 4 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | — | 736 | — | — |
| 831-203 | 5 | Salinas | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | — | 736 | — | — |
| 831-203 | 6 | Salinas | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | — | 736 | — | — |
| 831-203 | 7 | Salinas | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-203 | 8 | Salinas | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-203 | 9 | Salinas | Landline or VoIP | TERRA NOVA TELECOM INC. (145J) | MTRYCAPM5MD | 736 | — | — |
| 831-203 | A | Salinas | Landline or VoIP | NUSO, LLC (732J) | SLNTCAPS5MD | 736 | — | — |
| 831-204 | 0 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | 1 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | 2 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | 3 | Monterey | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-204 | 4 | Monterey | Landline or VoIP | TELNYX LLC (073H) | SLNSCA01XAY | 736 | — | — |
| 831-204 | 5 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | 6 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | 7 | Monterey | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - CA (8826) | SLNSCA01XXX | 736 | — | — |
| 831-204 | 8 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | 9 | Monterey | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-204 | A | Monterey | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-205 | 0 | Hollister | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-205 | 1 | Hollister | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-205 | 2 | Hollister | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - CA (8826) | SLNSCA01XXX | 736 | — | — |
| 831-205 | 3 | Hollister | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-205 | 4 | Hollister | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-205 | 5 | Hollister | Landline or VoIP | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (671J) | SLNSCA01XQY | 736 | — | — |
| 831-205 | 6 | Hollister | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - CA (7145) | SLNSCA01X1Y | 736 | — | — |
| 831-205 | 7 | Hollister | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - CA (981E) | MTRYCA012MD | 736 | — | — |
| 831-205 | 8 | Hollister | Landline or VoIP | METROPCS, INC. (5562) | SLNSCA01X8Y | 736 | — | — |
| 831-205 | 9 | Hollister | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-205 | A | Hollister | Landline or VoIP | TELEPORT COMMUNICATIONS AMERICA, LLC - CA (7145) | SLNSCA01X1Y | 736 | — | — |
| 831-206 | A | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-207 | 0 | Hollister | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-207 | 1 | Hollister | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-207 | 2 | Hollister | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-207 | 3 | Hollister | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-207 | 4 | Hollister | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - CA (8826) | SLNSCA01XXX | 736 | — | — |
| 831-207 | 5 | Hollister | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-207 | 6 | Hollister | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-207 | 7 | Hollister | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-207 | 8 | Hollister | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-207 | 9 | Hollister | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-207 | A | Hollister | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-208 | 0 | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-208 | 1 | Salinas | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-208 | 2 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-208 | 3 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-208 | 4 | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-208 | 5 | Salinas | Landline or VoIP | ONVOY, LLC - CA (649C) | SLNSCA01X9Y | 736 | — | — |
| 831-208 | 6 | Salinas | Landline or VoIP | COMCAST PHONE OF CALIFORNIA, LLC (394L) | SLNSCA01XHY | 736 | — | — |
| 831-208 | 7 | Salinas | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-208 | 8 | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-208 | 9 | Salinas | Wireless | NEW CINGULAR WIRELESS PCS, LLC (6010) | SLNSCABIXMD | 736 | — | — |
| 831-208 | A | Salinas | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6006) | SLNSCA01XEY | 736 | — | — |
| 831-210 | 0 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 1 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 2 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 3 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 4 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 5 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 6 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 7 | Salinas | Landline or VoIP | METROPCS, INC. (5562) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 8 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | 9 | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
| 831-210 | A | Salinas | Wireless | T-MOBILE USA, INC. (6529) | SLNSCA01X8Y | 736 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
407
Assignment Blocks
3,259
Rate Centers
24
Carriers of Record
49
| Type | Blocks | Share |
|---|---|---|
| Landline | 551 | 17% |
| Landline or VoIP | 1,850 | 57% |
| Wireless | 858 | 26% |
| Carrier | Blocks |
|---|---|
| PACIFIC BELL | 549 |
| ONVOY, LLC - CA | 515 |
| NEW CINGULAR WIRELESS PCS, LLC | 315 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 261 |
| METROPCS, INC. | 230 |
| BANDWIDTH.COM CLEC, LLC - CA | 211 |
| T-MOBILE USA, INC. | 208 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 138 |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 94 |
| IP HORIZON LLC | 91 |
| 39 other carriers | 647 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| Salinas | 84 | 654 |
| Santa Cruz | 77 | 588 |
| Monterey | 64 | 484 |
| Watsonville | 30 | 245 |
| Hollister | 22 | 194 |
| Aptos | 19 | 152 |
| Carmel | 12 | 87 |
| Ben Lomond | 11 | 86 |
| Boulder Creek | 9 | 76 |
| Felton | 9 | 78 |
| Soledad | 8 | 76 |
| Gonzales | 7 | 69 |
| Greenfield (Monterey) | 7 | 68 |
| King City | 7 | 60 |
| Big Sur | 6 | 41 |
| Castroville | 6 | 56 |
| Tres Pinos | 6 | 46 |
| Carmel Valley | 5 | 51 |
| Chualar | 4 | 38 |
| San Ardo | 4 | 34 |
| San Juan | 4 | 41 |
| San Lucas | 4 | 33 |
| Idria | 1 | 1 |
| Pinnacles | 1 | 1 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
Area code 831 is a North American Numbering Plan (NANP) telephone area code assigned to California, United States. It is one of 41 area codes serving California. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 831 is an active North American Numbering Plan (NANP) area code, currently assigned to California, United States. It is safe to answer or dial calls using this area code.
Area code 831 covers 24 cities and communities in California, including Aptos, Ben Lomond, Big Sur, Boulder Creek, Carmel, and 19 more localities. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 831 area code observe Pacific Time (IANA timezone: America/Los_Angeles). Pacific Time is UTC−8 in winter (PST) and UTC−7 in summer (PDT). When placing a call to a 831 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within California, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 831 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 831 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 831 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +18315550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.