CallataGuidesGet a local business phone number in Monterey, CA
Monterey's area code, prefixes and carriers from NANPA records, and how to put a Monterey number in front of your customers.
- Area code
- 831
- Exchanges
- 64NANPA-assigned
- Carriers
- 28
- Population
- 29,015Census 2024 est.
Area codes in Monterey
With 29,015 residents in the Census 2024 estimate, Monterey sits in Monterey County, California. All 64 exchanges NANPA lists for its rate center are in area code 831. Monterey is in the Pacific time zone.
According to NANPA's dialing-plan data, local calls within 831 are dialed as seven digits and toll calls as seven digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 831 | 64 | 100% | 1998 | none | Pacific |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Who holds Monterey phone exchanges
28 carriers hold the 64 exchanges assigned to Monterey's rate center. Pacific Bell has the most, with 27. 45 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Pacific Bell | 27 | 42% |
| New Cingular Wireless PCS, LLC | 4 | 6.3% |
| Cellco Partnership d/b/a Verizon Wireless - CA | 3 | 4.7% |
| Metropcs, INC. | 3 | 4.7% |
| Peerless Network of California, LLC - CA | 2 | 3.1% |
| Level 3 Communications, LLC - CA | 2 | 3.1% |
| Bandwidth.com CLEC, LLC - CA | 2 | 3.1% |
| Onvoy, LLC - CA | 1 | 1.6% |
| HD Carrier LLC | 1 | 1.6% |
| Vonage America LLC | 1 | 1.6% |
| T-mobile USA, INC. | 1 | 1.6% |
| Telnyx LLC | 1 | 1.6% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Local prefixes for Monterey
These are the central office codes NANPA records for Monterey. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 8 of the 64 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 831 | 200, 204, 215, 220, 224, 230, 233, 236, 241, 242, 259, 264, 275, 277, 282, 312, 317, 324, 333, 372, 373, 375, 383, 384, 392, 393, 394, 402, 468, 521, 582, 583, 601, 641, 642, 643, 644, 645, 646, 647, 648, 649, 655, 656, 657, 658, 717, 718, 747, 760, 855, 867, 869, 880, 881, 883, 884, 886, 887, 899, 901, 915, 917, 920 |
Source: NANPA utilized central office code file.
When Monterey's exchanges were assigned
Assignment dates show when each block of Monterey numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 7 | 37% |
| 2010s | 4 | 21% |
| 2020s | 8 | 42% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
Rate centers and local calling in Monterey
What a caller sees as "local" is the area code plus prefix. In Monterey, those come from the MONTEREY rate center, as recorded by NANPA.
New local numbers are drawn from carrier inventory, so the exact 831 numbers available change over time; porting an existing number is free.
Who does business near Monterey
Monterey is part of the Salinas, CA metro area, home to 436,000 people in 2024. County Business Patterns counted 9,212 business establishments in the Salinas, CA metro area in 2023, employing 116,784 people. The largest sectors by establishment count are retail trade (1,276), accommodation and food services (1,120), and construction (1,107).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Full-service restaurants | 380 | 7,385 | 19.4 |
| Limited-service restaurants | 305 | 5,469 | 17.9 |
| Physician practices | 256 | 1,743 | 6.8 |
| Residential remodelers | 238 | 1,065 | 4.5 |
| Hotels and motels | 192 | 6,362 | 33.1 |
| Dental offices | 183 | 1,365 | 7.5 |
| Landscaping services | 165 | 1,006 | 6.1 |
| Law offices | 141 | 646 | 4.6 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
A Monterey number on Callata
Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.
If you already have a number in Monterey, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
The comparison below uses 13 users, the rounded average establishment size in the Salinas, CA metro area. At list prices checked September 28, 2026, that is $324.35 a month on Ooma Office Pro and $390.00 on RingCentral RingEX Core. On Callata the same 13 people cost $259.00 a month, less than either per-seat plan.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $259.00 | $3,108.00 |
| Quo (Starter) | $19.00 per user | $247.00 | $2,964.00 |
| Nextiva (Core) | $23.00 per user | $299.00 | $3,588.00 |
| Ooma (Office Pro) | $24.95 per user | $324.35 | $3,892.20 |
| Dialpad (Standard) | $27.00 per user | $351.00 | $4,212.00 |
| RingCentral (RingEX Core) | $30.00 per user | $390.00 | $4,680.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Frequently asked questions
What area code is Monterey, CA?
831. All exchanges NANPA lists for Monterey are in 831.
How many phone companies have exchanges in Monterey?
28, holding 64 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Monterey business number?
Yes. Porting an existing number to Callata is free. Texting from it starts after carrier registration (10DLC), a one-time $49 fee.
How much is a business phone line in Monterey?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 13 users come to $259.00 a month. For comparison, 13 users on RingCentral RingEX Core list at $390.00 a month (checked September 28, 2026).