CallataGuidesGet a local business phone number in San Diego, TX
San Diego's area code, prefixes and carriers from NANPA records, and how to put a San Diego number in front of your customers.
- Area code
- 361
- Exchanges
- 4NANPA-assigned
- Carriers
- 4
- Population
- 3,620Census 2024 est.
What area code is San Diego, TX?
San Diego city is a Census place in Duval County, Texas, with an estimated 3,620 residents in 2024. All 4 exchanges NANPA lists for its rate center are in area code 361. San Diego is in the Central time zone.
According to NANPA's dialing-plan data, local calls within 361 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 361 | 4 | 100% | 1999 | none | Central |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Phone carriers in San Diego
4 carriers hold the 4 exchanges assigned to San Diego's rate center. AT&T Enterprises, LLC has the most, with 1. 4 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in San Diego can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| AT&T Enterprises, LLC | 1 | 25% |
| Southwestern Bell | 1 | 25% |
| Onvoy, LLC - TX | 1 | 25% |
| Fractel, LLC | 1 | 25% |
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 San Diego
Each prefix below is a block of up to 10,000 numbers that NANPA assigned to San Diego's rate center (SAN DIEGO). The earliest assignment date recorded in the file for these codes is 2018. 1 of the 4 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 361 | 209, 279, 366, 899 |
Source: NANPA utilized central office code file.
When San Diego's exchanges were assigned
The table groups San Diego's exchanges by the decade NANPA recorded them as assigned.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2010s | 1 | 50% |
| 2020s | 1 | 50% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
Rate centers and local calling in San Diego
What a caller sees as "local" is the area code plus prefix. In San Diego, those come from the SAN DIEGO rate center, as recorded by NANPA.
If your business already has a San Diego number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
Businesses around San Diego
San Diego is outside any Census metro or micropolitan area, so the figures below are statewide. County Business Patterns counted 670,878 business establishments in Texas in 2023, employing 12,012,629 people. The largest sectors by establishment count are retail trade (84,369), professional, scientific, and technical services (83,842), and health care and social assistance (80,576).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 24,360 | 545,407 | 22.4 |
| Physician practices | 21,500 | 217,413 | 10.1 |
| Full-service restaurants | 20,819 | 493,197 | 23.7 |
| Law offices | 13,833 | 87,363 | 6.3 |
| Insurance agencies and brokerages | 12,210 | 78,885 | 6.5 |
| Dental offices | 11,902 | 86,333 | 7.3 |
| Offices of real estate agents and brokers | 11,405 | 33,989 | 3.0 |
| Management consulting firms | 9,705 | 80,499 | 8.3 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Setting up a San Diego business line
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.
Porting a number you already use in San Diego is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.
AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.
An 18-person team is the benchmark here, the rounded average establishment size in Texas. 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. Callata comes to $359.00 a month for 18 users ($99 a month with 5 users included, then $20 per additional user), below both.
| 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 San Diego, TX?
361. All exchanges NANPA lists for San Diego are in 361.
How many phone companies have exchanges in San Diego?
4, holding 4 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing San Diego 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 San Diego?
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).