Phone numbers in Monrovia, California
Monrovia has 34 phone prefixes in area code 626.
Biggest holders: Frontier, Onvoy, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 6%
- Local phone company 38%
- Internet / business phone carrier 56%
Every prefix in Monrovia
Search the first six digits of a number in this list. If it's here, the number started in Monrovia with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 626-205 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 626-218 | AT&T (local phone) | Local phone company | 2012 |
| 626-239 | Frontier | Local phone company | – |
| 626-249 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 626-256 | Frontier | Local phone company | – |
| 626-263 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 626-275 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 626-301 | Frontier | Local phone company | – |
| 626-303 | Frontier | Local phone company | – |
| 626-305 | Frontier | Local phone company | – |
| 626-357 | Frontier | Local phone company | – |
| 626-358 | Frontier | Local phone company | – |
| 626-359 | Frontier | Local phone company | – |
| 626-386 | Tpx Communications | Internet / business phone carrier | – |
| 626-408 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 626-415 | Onvoy | Internet / business phone carrier | – |
| 626-471 | AT&T (local phone) | Local phone company | – |
| 626-509 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 626-531 | Charter / Spectrum | Internet / business phone carrier | – |
| 626-599 | Frontier | Local phone company | – |
| 626-605 | Onvoy | Internet / business phone carrier | – |
| 626-619 | Onvoy | Internet / business phone carrier | 2024 |
| 626-706 | Onvoy | Internet / business phone carrier | 2023 |
| 626-713 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 626-739 | Tpx Communications | Internet / business phone carrier | – |
| 626-775 | Tpx Communications | Internet / business phone carrier | – |
| 626-803 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 626-841 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 626-843 | Onvoy | Internet / business phone carrier | 2026 |
| 626-873 | Teleport Communications America | Internet / business phone carrier | – |
| 626-878 | Fractel | Internet / business phone carrier | 2022 |
| 626-879 | Fractel | Internet / business phone carrier | 2021 |
| 626-930 | Frontier | Local phone company | – |
| 626-932 | Frontier | Local phone company | – |
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.