CallataGuidesGet a local business phone number in San Marcos, TX
San Marcos's area codes, prefixes and carriers from NANPA records, and how to put a San Marcos number in front of your customers.
- Area code
- 512 / 737
- Exchanges
- 39NANPA-assigned
- Carriers
- 14
- Population
- 74,316Census 2024 est.
San Marcos area codes
San Marcos, in Hays County, Texas, had a Census-estimated population of 74,316 in July 2024. NANPA lists 39 exchanges for its rate center across 2 area codes; 512 has the most (26, 67%). 512 is part of an overlay with 737, so a new local number in San Marcos may carry any of those codes depending on which have numbers available. San Marcos is in the Central time zone.
According to NANPA's dialing-plan data, local calls within 512 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.
San Marcos exchanges by carrier
14 carriers hold the 39 exchanges assigned to San Marcos's rate center. Brightspeed of Southern Texas, INC. has the most, with 11. 31 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Brightspeed of Southern Texas, INC. | 11 | 28% |
| T-mobile USA, INC. | 7 | 18% |
| Cellco Partnership d/b/a Verizon Wireless - TX | 5 | 13% |
| New Cingular Wireless PCS, LLC - Il | 3 | 7.7% |
| Onvoy, LLC - TX | 3 | 7.7% |
| Grande Communications Networks, INC. - TX | 2 | 5.1% |
| Centurylink Communications, LLC | 1 | 2.6% |
| Level 3 Communications, LLC - TX | 1 | 2.6% |
| Skye Telecom LLC d/b/a Skyetel | 1 | 2.6% |
| Boost Subscriberco L.l.c. | 1 | 2.6% |
| Fractel, LLC | 1 | 2.6% |
| Twilio International, INC. | 1 | 2.6% |
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.
San Marcos phone prefixes
Each prefix below is a block of up to 10,000 numbers that NANPA assigned to San Marcos's rate center (SAN MARCOS). The earliest assignment date recorded in the file for these codes is 2006. 9 of the 39 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 512 | 210, 214, 216, 245, 353, 392, 393, 395, 396, 408, 557, 558, 618, 644, 665, 667, 738, 749, 753, 754, 757, 781, 787, 805, 878, 938 |
| 737 | 213, 214, 221, 266, 303, 315, 335, 344, 373, 387, 392, 422, 737 |
Source: NANPA utilized central office code file.
When San Marcos's exchanges were assigned
Assignment dates show when each block of San Marcos numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 3 | 16% |
| 2010s | 7 | 37% |
| 2020s | 9 | 47% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
How local numbers work in San Marcos
NANPA ties every exchange to a rate center. For San Marcos that is SAN MARCOS, so a number from one of these exchanges reads as local to people in and around San Marcos.
If your business already has a San Marcos number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
The local business market
San Marcos is part of the Austin-Round Rock-San Marcos, TX metro area, home to 2.6 million people in 2024. County Business Patterns counted 66,280 business establishments in the Austin, TX metro area in 2023, employing 1,042,004 people. The largest sectors by establishment count are professional, scientific, and technical services (12,232), health care and social assistance (7,125), and retail trade (6,650).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 1,894 | 44,562 | 23.5 |
| Offices of real estate agents and brokers | 1,838 | 4,339 | 2.4 |
| Full-service restaurants | 1,750 | 47,560 | 27.2 |
| Physician practices | 1,679 | 22,448 | 13.4 |
| Management consulting firms | 1,548 | 9,536 | 6.2 |
| Law offices | 1,524 | 9,771 | 6.4 |
| Custom computer programming services firms | 1,461 | 28,216 | 19.3 |
| Computer systems design services firms | 1,095 | 10,111 | 9.2 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Business phone service in San Marcos
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 San Marcos, 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 16-person team is the benchmark here, the rounded average establishment size in the Austin, TX metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $480.00 a month and Ooma Office Pro $399.20. On Callata the same 16 people cost $319.00 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 | $319.00 | $3,828.00 |
| Quo (Starter) | $19.00 per user | $304.00 | $3,648.00 |
| Nextiva (Core) | $23.00 per user | $368.00 | $4,416.00 |
| Ooma (Office Pro) | $24.95 per user | $399.20 | $4,790.40 |
| Dialpad (Standard) | $27.00 per user | $432.00 | $5,184.00 |
| RingCentral (RingEX Core) | $30.00 per user | $480.00 | $5,760.00 |
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 Marcos, TX?
San Marcos has exchanges in 512 and 737; 512 has the most.
How many phone companies have exchanges in San Marcos?
14, holding 39 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing San Marcos 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 Marcos?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 16 users come to $319.00 a month. For comparison, 16 users on RingCentral RingEX Core list at $480.00 a month (checked September 28, 2026).