NORWALK prefixes in area code 475
NANPA records 22 assigned NXX blocks to rate center NORWALK in area code 475, 7.5% of the 292 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. 10 holders hold those blocks, the largest being CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT (10), OMNIPOINT COMMUNICATIONS, INC. - CT (3), LEVEL 3 COMMUNICATIONS, LLC - CT (2). The earliest assignment on record here is 2014-10-03 and the most recent 2025-10-14. 22 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 203, 419, 562, 567 – 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 |
|---|---|---|---|---|
| 475-208 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CT | 2014-12-08 | yes | yes |
| 475-245 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2016-02-08 | yes | yes |
| 475-250 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2018-07-23 | yes | yes |
| 475-257 | CSC WIRELESS, LLC | 2019-03-28 | yes | yes |
| 475-258 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT | 2019-09-12 | yes | yes |
| 475-266 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2015-06-10 | yes | yes |
| 475-283 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2016-01-05 | yes | yes |
| 475-288 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CT | 2014-10-03 | yes | yes |
| 475-291 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2021-09-27 | yes | yes |
| 475-322 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2016-04-25 | yes | yes |
| 475-393 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT | 2017-07-12 | yes | yes |
| 475-395 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2015-09-17 | yes | yes |
| 475-397 | Altice CABLEVISION LIGHTPATH, INC. - CT | 2025-10-14 | yes | yes |
| 475-459 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2018-04-20 | yes | yes |
| 475-470 | Onvoy ONVOY, LLC - CT | 2016-02-11 | yes | yes |
| 475-489 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2015-11-17 | yes | yes |
| 475-544 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT | 2022-01-14 | yes | yes |
| 475-673 | TON80 COMMUNICATIONS, LLC | 2022-01-10 | yes | yes |
| 475-747 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2015-06-04 | yes | yes |
| 475-755 | FRACTEL, LLC | 2020-07-22 | yes | yes |
| 475-850 | BARR TEL USA, INC. - CT | 2022-03-02 | yes | yes |
| 475-889 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | 2018-02-09 | 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 |
|---|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT | Verizon | 10 | 45.5% |
| OMNIPOINT COMMUNICATIONS, INC. - CT | T-Mobile | 3 | 13.6% |
| LEVEL 3 COMMUNICATIONS, LLC - CT | Lumen | 2 | 9.1% |
| CSC WIRELESS, LLC | – | 1 | 4.5% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 1 | 4.5% |
| CABLEVISION LIGHTPATH, INC. - CT | Altice | 1 | 4.5% |
| ONVOY, LLC - CT | Onvoy | 1 | 4.5% |
| TON80 COMMUNICATIONS, LLC | – | 1 | 4.5% |
| FRACTEL, LLC | – | 1 | 4.5% |
| BARR TEL USA, INC. - CT | – | 1 | 4.5% |
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 NORWALK in area code 475?
22 blocks: 208, 245, 250, 257, 258, 266, 283, 288, 291, 322, 393, 395 and 10 more, all listed in the table above.
Which carriers have numbers in NORWALK?
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT (10 blocks), OMNIPOINT COMMUNICATIONS, INC. - CT (3 blocks), LEVEL 3 COMMUNICATIONS, LLC - CT (2 blocks), CSC WIRELESS, LLC (1 block), NEW CINGULAR WIRELESS PCS, LLC - DC (1 block), CABLEVISION LIGHTPATH, INC. - CT (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is NORWALK 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.