Phone numbers in Sierra Madre, California
Sierra Madre has 17 phone prefixes in area code 626.
Biggest holders: Frontier, MCImetro (Verizon Business), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 35%
- Internet / business phone carrier 53%
Every prefix in Sierra Madre
Search the first six digits of a number in this list. If it's here, the number started in Sierra Madre with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 626-264 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 626-306 | Frontier | Local phone company | – |
| 626-325 | Teleport Communications America | Internet / business phone carrier | – |
| 626-351 | Frontier | Local phone company | – |
| 626-355 | Frontier | Local phone company | – |
| 626-466 | T-Mobile (including Sprint) | Mobile carrier | – |
| 626-470 | AT&T (local phone) | Local phone company | – |
| 626-507 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 626-510 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 626-604 | Skyetel | Internet / business phone carrier | – |
| 626-708 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 626-745 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 626-790 | Onvoy | Internet / business phone carrier | – |
| 626-822 | Frontier | Local phone company | – |
| 626-828 | Fractel | Internet / business phone carrier | 2022 |
| 626-836 | Frontier | Local phone company | – |
| 626-921 | Tpx Communications | Internet / business phone carrier | – |
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.