Phone numbers in Closter, New Jersey
Closter has 21 phone prefixes in area codes 201, 551.
Biggest holders: Verizon (local phone), T-Mobile (including Sprint), Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 19%
- Local phone company 24%
- Internet / business phone carrier 52%
- Phone company 5%
Every prefix in Closter
Search the first six digits of a number in this list. If it's here, the number started in Closter with the carrier shown. If it isn't, check the New Jersey page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 201-256 | AT&T (local phone) | Local phone company | – |
| 201-297 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 201-367 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 201-564 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 201-588 | Teleport Communications America | Internet / business phone carrier | 2007 |
| 201-660 | Teleport Communications America | Internet / business phone carrier | – |
| 201-750 | Verizon (local phone) | Local phone company | – |
| 201-767 | Verizon (local phone) | Local phone company | – |
| 201-768 | Verizon (local phone) | Local phone company | – |
| 201-784 | Verizon (local phone) | Local phone company | – |
| 201-899 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 201-905 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 201-908 | Onvoy | Internet / business phone carrier | 2023 |
| 551-236 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 551-248 | Airus | Phone company | 2015 |
| 551-288 | Onvoy | Internet / business phone carrier | 2020 |
| 551-303 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 551-346 | T-Mobile (including Sprint) | Mobile carrier | 2022 |
| 551-395 | Onvoy | Internet / business phone carrier | 2024 |
| 551-406 | Onvoy | Internet / business phone carrier | 2024 |
| 551-755 | Fractel | Internet / business phone carrier | 2021 |
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.