LANCASTER prefixes in area code 661
NANPA records 56 assigned NXX blocks to rate center LANCASTER in area code 661, 8.3% of the 674 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. 17 holders hold those blocks, the largest being FRONTIER CALIFORNIA INC. (15), NEW CINGULAR WIRELESS PCS, LLC (9), T-MOBILE USA, INC. (8). The earliest assignment on record here is 2001-02-07 and the most recent 2026-09-03. 41 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 218, 220, 223, 603 – 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 |
|---|---|---|---|---|
| 661-206 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 661-216 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 661-341 | AT&T AT&T - LOCAL | – | yes | yes |
| 661-353 | UTILITY TELECOM GROUP, LLC - CA | – | yes | yes |
| 661-405 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2017-08-01 | yes | yes |
| 661-418 | T-Mobile T-MOBILE USA, INC. | 2012-02-24 | yes | yes |
| 661-423 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-429 | T-Mobile T-MOBILE USA, INC. | 2012-09-24 | yes | yes |
| 661-445 | T-Mobile T-MOBILE USA, INC. | 2014-10-14 | yes | yes |
| 661-466 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 661-470 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2014-06-09 | yes | yes |
| 661-471 | Lumen CENTURYLINK COMMUNICATIONS, LLC | 2013-02-01 | yes | yes |
| 661-483 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2014-06-24 | yes | yes |
| 661-488 | T-Mobile T-MOBILE USA, INC. | 2014-12-22 | yes | yes |
| 661-492 | T-Mobile T-MOBILE USA, INC. | 2001-10-10 | yes | yes |
| 661-494 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2014-10-08 | yes | yes |
| 661-499 | AIRESPRING, INC. | 2020-05-19 | yes | yes |
| 661-522 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2015-02-09 | yes | yes |
| 661-524 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2008-05-27 | yes | yes |
| 661-547 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 661-571 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2022-04-12 | yes | yes |
| 661-579 | Onvoy ONVOY, LLC - CA | 2008-05-28 | yes | yes |
| 661-582 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2015-10-21 | yes | yes |
| 661-604 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2023-02-17 | yes | yes |
| 661-609 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 661-643 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2024-07-03 | yes | yes |
| 661-646 | Onvoy ONVOY, LLC - CA | 2024-07-05 | yes | yes |
| 661-674 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 661-676 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2025-03-21 | yes | yes |
| 661-683 | Onvoy ONVOY, LLC - CA | 2025-09-03 | yes | yes |
| 661-693 | Onvoy ONVOY, LLC - CA | 2026-09-03 | yes | no |
| 661-718 | Frontier FRONTIER CALIFORNIA INC. | – | yes | yes |
| 661-722 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-723 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-726 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-728 | Frontier FRONTIER CALIFORNIA INC. | – | yes | yes |
| 661-729 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-743 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2023-06-22 | yes | yes |
| 661-802 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 661-874 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 661-886 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2001-02-07 | yes | yes |
| 661-899 | FRACTEL, LLC | 2019-05-13 | yes | yes |
| 661-902 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | yes | yes |
| 661-916 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | yes | yes |
| 661-917 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 661-940 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-941 | Charter TWC IP ENABLED SERVICES, LLC | 2013-03-12 | yes | yes |
| 661-942 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-943 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-945 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-946 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-948 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-949 | Frontier FRONTIER CALIFORNIA INC. | – | yes | yes |
| 661-951 | Frontier FRONTIER CALIFORNIA INC. | – | no | yes |
| 661-952 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 661-974 | AT&T PACIFIC BELL (COMPETITIVE) | – | 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 |
|---|---|---|---|
| FRONTIER CALIFORNIA INC. | Frontier | 15 | 26.8% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 9 | 16.1% |
| T-MOBILE USA, INC. | T-Mobile | 8 | 14.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 6 | 10.7% |
| ONVOY, LLC - CA | Onvoy | 5 | 8.9% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 2 | 3.6% |
| PAETEC ITEL, LLC | Windstream | 1 | 1.8% |
| AMERICAN MESSAGING SERVICES, LLC | American Messaging | 1 | 1.8% |
| AT&T - LOCAL | AT&T | 1 | 1.8% |
| UTILITY TELECOM GROUP, LLC - CA | – | 1 | 1.8% |
| CENTURYLINK COMMUNICATIONS, LLC | Lumen | 1 | 1.8% |
| AIRESPRING, INC. | – | 1 | 1.8% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 1 | 1.8% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 1 | 1.8% |
| FRACTEL, LLC | – | 1 | 1.8% |
| TWC IP ENABLED SERVICES, LLC | Charter | 1 | 1.8% |
| PACIFIC BELL (COMPETITIVE) | AT&T | 1 | 1.8% |
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 LANCASTER in area code 661?
56 blocks: 206, 216, 341, 353, 405, 418, 423, 429, 445, 466, 470, 471 and 44 more, all listed in the table above.
Which carriers have numbers in LANCASTER?
FRONTIER CALIFORNIA INC. (15 blocks), NEW CINGULAR WIRELESS PCS, LLC (9 blocks), T-MOBILE USA, INC. (8 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (6 blocks), ONVOY, LLC - CA (5 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is LANCASTER 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.