Phone numbers in San Marcos, Texas
San Marcos has 39 phone prefixes in area codes 512, 737.
Biggest holders: Brightspeed Of Southern Texas, T-Mobile (including Sprint), Verizon Wireless. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 41%
- Local phone company 31%
- Internet / business phone carrier 21%
- Phone company 8%
Every prefix in San Marcos
Search the first six digits of a number in this list. If it's here, the number started in San Marcos with the carrier shown. If it isn't, check the Texas page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 512-210 | Verizon Wireless | Mobile carrier | 2015 |
| 512-214 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 512-216 | AT&T Mobility | Mobile carrier | 2006 |
| 512-245 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-353 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-392 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-393 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-395 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-396 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-408 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-557 | Verizon Wireless | Mobile carrier | – |
| 512-558 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-618 | AT&T Mobility | Mobile carrier | – |
| 512-644 | T-Mobile (including Sprint) | Mobile carrier | – |
| 512-665 | T-Mobile (including Sprint) | Mobile carrier | – |
| 512-667 | Verizon Wireless | Mobile carrier | – |
| 512-738 | T-Mobile (including Sprint) | Mobile carrier | – |
| 512-749 | Verizon Wireless | Mobile carrier | 2006 |
| 512-753 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-754 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-757 | AT&T Mobility | Mobile carrier | – |
| 512-781 | CenturyLink / Lumen | Local phone company | 2012 |
| 512-787 | T-Mobile (including Sprint) | Mobile carrier | – |
| 512-805 | Brightspeed Of Southern Texas | Local phone company | – |
| 512-878 | Grande Communications Networks | Phone company | – |
| 512-938 | Grande Communications Networks | Phone company | 2007 |
| 737-213 | Verizon Wireless | Mobile carrier | 2016 |
| 737-214 | Onvoy | Internet / business phone carrier | 2017 |
| 737-221 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 737-266 | Level 3 (Lumen) | Internet / business phone carrier | 2020 |
| 737-303 | Skyetel | Internet / business phone carrier | 2021 |
| 737-315 | Boost / Virgin Mobile | Mobile carrier | 2022 |
| 737-335 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 737-344 | Onvoy | Internet / business phone carrier | 2020 |
| 737-373 | Fractel | Internet / business phone carrier | 2019 |
| 737-387 | Onvoy | Internet / business phone carrier | 2023 |
| 737-392 | Twilio | Internet / business phone carrier | 2024 |
| 737-422 | Terra Nova Telecom | Internet / business phone carrier | 2025 |
| 737-737 | Usfon | Phone company | 2023 |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.