CallataGuidesGet a local business phone number in Greenfield, CA
Greenfield's area code, prefixes and carriers from NANPA records, and how to put a Greenfield number in front of your customers.
- Area code
- 831
- Exchanges
- 7NANPA-assigned
- Carriers
- 5
- Population
- 21,042Census 2024 est.
Greenfield area codes
Greenfield city is a Census place in Monterey County, California, with an estimated 21,042 residents in 2024. All 7 exchanges NANPA lists for its rate center are in area code 831. Greenfield 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 | 7 | 100% | 1998 | none | Pacific |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Greenfield exchanges by carrier
5 carriers hold the 7 exchanges assigned to Greenfield's rate center. Onvoy, LLC - CA has the most, with 2. 7 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Greenfield can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Onvoy, LLC - CA | 2 | 29% |
| Bandwidth.com CLEC, LLC - CA | 2 | 29% |
| Onvoy Spectrum, LLC | 1 | 14% |
| Peerless Network of California, LLC - CA | 1 | 14% |
| Pacific Bell | 1 | 14% |
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.
Greenfield phone prefixes
Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Greenfield's rate center (GREENFIELD). The earliest assignment date recorded in the file for these codes is 2019. 2 of the 7 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 831 | 231, 286, 304, 388, 613, 674, 856 |
Source: NANPA utilized central office code file.
When Greenfield's exchanges were assigned
Assignment dates show when each block of Greenfield numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2010s | 1 | 33% |
| 2020s | 2 | 67% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
What makes a number local to Greenfield
NANPA ties every exchange to a rate center. For Greenfield that is GREENFIELD, so a number from one of these exchanges reads as local to people in and around Greenfield.
If your business already has a Greenfield number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
Businesses around Greenfield
Greenfield 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 Greenfield 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 Greenfield, 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.
A 13-person team is the benchmark here, the rounded average establishment size in the Salinas, CA metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $390.00 a month and Ooma Office Pro $324.35. 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 Greenfield, CA?
831. All exchanges NANPA lists for Greenfield are in 831.
How many phone companies have exchanges in Greenfield?
5, holding 7 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Greenfield 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 Greenfield?
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).