SAN MARCOS prefixes in area code 737
NANPA records 13 assigned NXX blocks to rate center SAN MARCOS in area code 737, 3.9% of the 333 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 10 holders hold those blocks, the largest being ONVOY, LLC - TX (3), T-MOBILE USA, INC. (2), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX (1). The earliest assignment on record here is 2016-01-11 and the most recent 2025-07-15. 13 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 442, 512, 760 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 737-213 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 2016-01-11 | yes | yes |
| 737-214 | Onvoy ONVOY, LLC - TX | 2017-04-14 | yes | yes |
| 737-221 | T-Mobile T-MOBILE USA, INC. | 2017-07-20 | yes | yes |
| 737-266 | Lumen LEVEL 3 COMMUNICATIONS, LLC - TX | 2020-01-23 | yes | yes |
| 737-303 | SKYE TELECOM LLC DBA SKYETEL | 2021-09-07 | yes | yes |
| 737-315 | Dish BOOST SUBSCRIBERCO L.L.C. | 2022-01-27 | yes | yes |
| 737-335 | T-Mobile T-MOBILE USA, INC. | 2022-09-27 | yes | yes |
| 737-344 | Onvoy ONVOY, LLC - TX | 2020-10-28 | yes | yes |
| 737-373 | FRACTEL, LLC | 2019-05-21 | yes | yes |
| 737-387 | Onvoy ONVOY, LLC - TX | 2023-02-17 | yes | yes |
| 737-392 | Twilio TWILIO INTERNATIONAL, INC. | 2024-06-10 | yes | yes |
| 737-422 | TERRA NOVA TELECOM INC. | 2025-07-15 | yes | yes |
| 737-737 | USFON, INC. - TX | 2023-01-25 | yes | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| ONVOY, LLC - TX | Onvoy | 3 | 23.1% |
| T-MOBILE USA, INC. | T-Mobile | 2 | 15.4% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | Verizon | 1 | 7.7% |
| LEVEL 3 COMMUNICATIONS, LLC - TX | Lumen | 1 | 7.7% |
| SKYE TELECOM LLC DBA SKYETEL | – | 1 | 7.7% |
| BOOST SUBSCRIBERCO L.L.C. | Dish | 1 | 7.7% |
| FRACTEL, LLC | – | 1 | 7.7% |
| TWILIO INTERNATIONAL, INC. | Twilio | 1 | 7.7% |
| TERRA NOVA TELECOM INC. | – | 1 | 7.7% |
| USFON, INC. - TX | – | 1 | 7.7% |
Same rate center in other codes
Overlay codes cover the same geography, so one rate center is served by all of them.
Frequently asked
Which prefixes belong to SAN MARCOS in area code 737?
13 blocks: 213, 214, 221, 266, 303, 315, 335, 344, 373, 387, 392, 422 and 1 more, all listed in the table above.
Which carriers have numbers in SAN MARCOS?
ONVOY, LLC - TX (3 blocks), T-MOBILE USA, INC. (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX (1 block), LEVEL 3 COMMUNICATIONS, LLC - TX (1 block), SKYE TELECOM LLC DBA SKYETEL (1 block), BOOST SUBSCRIBERCO L.L.C. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is SAN MARCOS a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.