CallataGuidesGet a local business phone number in Orinda, CA
Orinda's area code, prefixes and carriers from NANPA records, and how to put a Orinda number in front of your customers.
- Area code
- 925
- Exchanges
- 12NANPA-assigned
- Carriers
- 8
- Population
- 19,573Census 2024 est.
Orinda area codes
Orinda city is a Census place in Contra Costa County, California, with an estimated 19,573 residents in 2024. All 12 exchanges NANPA lists for its rate center are in area code 925. Orinda is in the Pacific time zone.
According to NANPA's dialing-plan data, local calls within 925 are dialed as 1 plus ten digits and toll calls as 1 plus ten digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 925 | 12 | 100% | 1998 | none | Pacific |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Orinda exchanges by carrier
8 carriers hold the 12 exchanges assigned to Orinda's rate center. Pacific Bell has the most, with 3. 10 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Orinda can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Pacific Bell | 3 | 25% |
| Mcimetro Access Transmission Services LLC | 3 | 25% |
| Mcimetro Access Transmission Services LLC - CA | 1 | 8.3% |
| Bandwidth.com CLEC, LLC - CA | 1 | 8.3% |
| Teleport Communications America, LLC - CA | 1 | 8.3% |
| U.s. Telepacific Corp. d/b/a TPX Communications | 1 | 8.3% |
| T-mobile USA, INC. | 1 | 8.3% |
| Matrix Telecom, LLC. S/i/i Tnci - CA | 1 | 8.3% |
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.
Orinda phone prefixes
A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Orinda. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 925 | 253, 254, 255, 257, 258, 259, 317, 386, 402, 438, 528, 885 |
Source: NANPA utilized central office code file.
How local numbers work in Orinda
What a caller sees as "local" is the area code plus prefix. In Orinda, those come from the ORINDA rate center, as recorded by NANPA.
Keeping an existing Orinda number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 925 when you pick it.
The local business market
Orinda is part of the San Francisco-Oakland-Fremont, CA metro area, home to 4.6 million people in 2024. County Business Patterns counted 133,246 business establishments in the San Francisco, CA metro area in 2023, employing 2,417,363 people. The largest sectors by establishment count are professional, scientific, and technical services (23,140), health care and social assistance (16,920), and accommodation and food services (13,736).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Full-service restaurants | 5,136 | 86,434 | 16.8 |
| Limited-service restaurants | 4,140 | 59,849 | 14.5 |
| Dental offices | 3,029 | 19,225 | 6.3 |
| Offices of real estate agents and brokers | 2,990 | 10,454 | 3.5 |
| Law offices | 2,984 | 25,802 | 8.6 |
| Custom computer programming services firms | 2,959 | 58,995 | 19.9 |
| Residential remodelers | 2,924 | 14,184 | 4.9 |
| Management consulting firms | 2,756 | 16,952 | 6.2 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Business phone service in Orinda
For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.
If you already have a number in Orinda, 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.
An 18-person team is the benchmark here, the rounded average establishment size in the San Francisco, CA metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $540.00 a month and Ooma Office Pro $449.10. On Callata the same 18 people cost $359.00 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 | $359.00 | $4,308.00 |
| Quo (Starter) | $19.00 per user | $342.00 | $4,104.00 |
| Nextiva (Core) | $23.00 per user | $414.00 | $4,968.00 |
| Ooma (Office Pro) | $24.95 per user | $449.10 | $5,389.20 |
| Dialpad (Standard) | $27.00 per user | $486.00 | $5,832.00 |
| RingCentral (RingEX Core) | $30.00 per user | $540.00 | $6,480.00 |
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 Orinda, CA?
925. All exchanges NANPA lists for Orinda are in 925.
How many phone companies have exchanges in Orinda?
8, holding 12 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Orinda 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 Orinda?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 18 users come to $359.00 a month. For comparison, 18 users on RingCentral RingEX Core list at $540.00 a month (checked September 28, 2026).