Phone numbers in Lancaster, California
Lancaster has 56 phone prefixes in area code 661.
Biggest holders: Frontier, AT&T Mobility, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 41%
- Local phone company 32%
- Internet / business phone carrier 21%
- Paging service 2%
- Phone company 4%
Every prefix in Lancaster
Search the first six digits of a number in this list. If it's here, the number started in Lancaster with the carrier shown. If it isn't, check the California page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 661-206 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 661-216 | American Messaging Services | Paging service | – |
| 661-341 | AT&T (local phone) | Local phone company | – |
| 661-353 | Utility Telecom Group | Phone company | – |
| 661-405 | AT&T Mobility | Mobile carrier | 2017 |
| 661-418 | T-Mobile (including Sprint) | Mobile carrier | 2012 |
| 661-423 | Frontier | Local phone company | – |
| 661-429 | T-Mobile (including Sprint) | Mobile carrier | 2012 |
| 661-445 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 661-466 | Onvoy | Internet / business phone carrier | – |
| 661-470 | AT&T Mobility | Mobile carrier | 2014 |
| 661-471 | CenturyLink / Lumen | Local phone company | 2013 |
| 661-483 | Verizon Wireless | Mobile carrier | 2014 |
| 661-488 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 661-492 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 661-494 | AT&T Mobility | Mobile carrier | 2014 |
| 661-499 | Airespring | Phone company | 2020 |
| 661-522 | Bandwidth | Internet / business phone carrier | 2015 |
| 661-524 | Level 3 (Lumen) | Internet / business phone carrier | 2008 |
| 661-547 | T-Mobile (including Sprint) | Mobile carrier | – |
| 661-571 | Verizon Wireless | Mobile carrier | 2022 |
| 661-579 | Onvoy | Internet / business phone carrier | 2008 |
| 661-582 | AT&T Mobility | Mobile carrier | 2015 |
| 661-604 | Verizon Wireless | Mobile carrier | 2023 |
| 661-609 | AT&T Mobility | Mobile carrier | – |
| 661-643 | Verizon Wireless | Mobile carrier | 2024 |
| 661-646 | Onvoy | Internet / business phone carrier | 2024 |
| 661-674 | T-Mobile (including Sprint) | Mobile carrier | – |
| 661-676 | Verizon Wireless | Mobile carrier | 2025 |
| 661-683 | Onvoy | Internet / business phone carrier | 2025 |
| 661-693 | Onvoy | Internet / business phone carrier | 2026 |
| 661-718 | Frontier | Local phone company | – |
| 661-722 | Frontier | Local phone company | – |
| 661-723 | Frontier | Local phone company | – |
| 661-726 | Frontier | Local phone company | – |
| 661-728 | Frontier | Local phone company | – |
| 661-729 | Frontier | Local phone company | – |
| 661-743 | AT&T Mobility | Mobile carrier | 2023 |
| 661-802 | Teleport Communications America | Internet / business phone carrier | – |
| 661-874 | T-Mobile (including Sprint) | Mobile carrier | – |
| 661-886 | AT&T Mobility | Mobile carrier | 2001 |
| 661-899 | Fractel | Internet / business phone carrier | 2019 |
| 661-902 | Verizon Wireless | Mobile carrier | – |
| 661-916 | AT&T Mobility | Mobile carrier | – |
| 661-917 | AT&T Mobility | Mobile carrier | – |
| 661-940 | Frontier | Local phone company | – |
| 661-941 | Charter / Spectrum | Internet / business phone carrier | 2013 |
| 661-942 | Frontier | Local phone company | – |
| 661-943 | Frontier | Local phone company | – |
| 661-945 | Frontier | Local phone company | – |
| 661-946 | Frontier | Local phone company | – |
| 661-948 | Frontier | Local phone company | – |
| 661-949 | Frontier | Local phone company | – |
| 661-951 | Frontier | Local phone company | – |
| 661-952 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 661-974 | AT&T (local phone) | 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.