SHERIDAN prefixes in area code 307
NANPA records 17 assigned NXX blocks to rate center SHERIDAN in area code 307, 3.4% of the 499 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. 9 holders hold those blocks, the largest being QWEST CORPORATION (5), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY (3), ONVOY, LLC - WY (2). The earliest assignment on record here is 2002-06-11 and the most recent 2025-12-03. 11 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 317, 406, 463, 503 – 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 |
|---|---|---|---|---|
| 307-218 | Onvoy ONVOY, LLC - WY | 2019-08-13 | yes | yes |
| 307-381 | Bandwidth BANDWIDTH.COM CLEC, LLC - WY | 2021-04-23 | yes | yes |
| 307-429 | Bandwidth BANDWIDTH.COM CLEC, LLC - WY | 2013-05-23 | yes | yes |
| 307-435 | T-Mobile T-MOBILE USA, INC. | 2025-12-03 | yes | yes |
| 307-461 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WY | 2002-06-11 | yes | yes |
| 307-533 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 2006-12-05 | yes | yes |
| 307-655 | Lumen QWEST CORPORATION | – | yes | yes |
| 307-672 | Lumen QWEST CORPORATION | – | no | yes |
| 307-673 | Lumen QWEST CORPORATION | – | no | yes |
| 307-674 | Lumen QWEST CORPORATION | – | no | yes |
| 307-675 | ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY | 2003-01-30 | no | yes |
| 307-683 | Lumen QWEST CORPORATION | – | yes | yes |
| 307-706 | UNION TELEPHONE COMPANY | 2002-12-27 | no | yes |
| 307-751 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | yes | yes |
| 307-752 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | – | no | yes |
| 307-763 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | – | yes | yes |
| 307-998 | Onvoy ONVOY, LLC - WY | 2024-06-14 | 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 |
|---|---|---|---|
| QWEST CORPORATION | Lumen | 5 | 29.4% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | Verizon | 3 | 17.6% |
| ONVOY, LLC - WY | Onvoy | 2 | 11.8% |
| BANDWIDTH.COM CLEC, LLC - WY | Bandwidth | 2 | 11.8% |
| T-MOBILE USA, INC. | T-Mobile | 1 | 5.9% |
| LEVEL 3 COMMUNICATIONS, LLC - WY | Lumen | 1 | 5.9% |
| ADVANCED COMMUNICATIONS TECHNOLOGY, INC. - WY | – | 1 | 5.9% |
| UNION TELEPHONE COMPANY | – | 1 | 5.9% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 1 | 5.9% |
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 SHERIDAN in area code 307?
17 blocks: 218, 381, 429, 435, 461, 533, 655, 672, 673, 674, 675, 683 and 5 more, all listed in the table above.
Which carriers have numbers in SHERIDAN?
QWEST CORPORATION (5 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY (3 blocks), ONVOY, LLC - WY (2 blocks), BANDWIDTH.COM CLEC, LLC - WY (2 blocks), T-MOBILE USA, INC. (1 block), LEVEL 3 COMMUNICATIONS, LLC - WY (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is SHERIDAN 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.