UNION CITY prefixes in area code 551
NANPA records 24 assigned NXX blocks to rate center UNION CITY in area code 551, 8.0% of the 300 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. 7 holders hold those blocks, the largest being OMNIPOINT COMMUNICATIONS, INC. - NJ (11), NEW CINGULAR WIRELESS PCS, LLC - DC (4), ONVOY, LLC - NJ (4). The earliest assignment on record here is 2002-05-06 and the most recent 2026-07-27. 24 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 201, 405, 517, 582 – 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 |
|---|---|---|---|---|
| 551-240 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2015-12-30 | yes | yes |
| 551-254 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2015-04-16 | yes | yes |
| 551-257 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2014-11-14 | yes | yes |
| 551-268 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2016-05-17 | yes | yes |
| 551-300 | Onvoy ONVOY, LLC - NJ | 2018-01-19 | yes | yes |
| 551-306 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2019-08-12 | yes | yes |
| 551-323 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2021-06-30 | yes | yes |
| 551-327 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2021-08-27 | yes | yes |
| 551-331 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2021-10-06 | yes | yes |
| 551-342 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2021-12-06 | yes | yes |
| 551-347 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2022-01-27 | yes | yes |
| 551-373 | Onvoy ONVOY, LLC - NJ | 2023-03-14 | yes | yes |
| 551-375 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2023-06-29 | yes | yes |
| 551-377 | Onvoy ONVOY, LLC - NJ | 2023-09-18 | yes | yes |
| 551-384 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2023-10-11 | yes | yes |
| 551-401 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2024-08-22 | yes | yes |
| 551-421 | Altice CABLEVISION LIGHTPATH, INC. - NJ | 2025-04-03 | yes | yes |
| 551-438 | Onvoy ONVOY, LLC - NJ | 2026-07-27 | yes | no |
| 551-482 | AT&T NEW CINGULAR WIRELESS PCS, LLC - DC | 2002-05-06 | yes | yes |
| 551-529 | FRACTEL, LLC | 2020-02-14 | yes | yes |
| 551-556 | T-Mobile OMNIPOINT COMMUNICATIONS, INC. - NJ | 2002-11-13 | yes | yes |
| 551-786 | FRACTEL, LLC | 2020-10-14 | yes | yes |
| 551-799 | TON80 COMMUNICATIONS, LLC | 2022-03-04 | yes | yes |
| 551-888 | Peerless PEERLESS NETWORK OF NEW JERSEY, LLC - NJ | 2012-11-19 | 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 |
|---|---|---|---|
| OMNIPOINT COMMUNICATIONS, INC. - NJ | T-Mobile | 11 | 45.8% |
| NEW CINGULAR WIRELESS PCS, LLC - DC | AT&T | 4 | 16.7% |
| ONVOY, LLC - NJ | Onvoy | 4 | 16.7% |
| FRACTEL, LLC | – | 2 | 8.3% |
| CABLEVISION LIGHTPATH, INC. - NJ | Altice | 1 | 4.2% |
| TON80 COMMUNICATIONS, LLC | – | 1 | 4.2% |
| PEERLESS NETWORK OF NEW JERSEY, LLC - NJ | Peerless | 1 | 4.2% |
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 UNION CITY in area code 551?
24 blocks: 240, 254, 257, 268, 300, 306, 323, 327, 331, 342, 347, 373 and 12 more, all listed in the table above.
Which carriers have numbers in UNION CITY?
OMNIPOINT COMMUNICATIONS, INC. - NJ (11 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (4 blocks), ONVOY, LLC - NJ (4 blocks), FRACTEL, LLC (2 blocks), CABLEVISION LIGHTPATH, INC. - NJ (1 block), TON80 COMMUNICATIONS, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is UNION CITY 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.