Phone numbers in Williamstown, New Jersey
Williamstown has 25 phone prefixes in area code 856.
Biggest holders: Verizon (local phone), Verizon Wireless, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 20%
- Internet / business phone carrier 56%
- Phone company 4%
Every prefix in Williamstown
Search the first six digits of a number in this list. If it's here, the number started in Williamstown with the carrier shown. If it isn't, check the New Jersey page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 856-237 | Teleport Communications America | Internet / business phone carrier | – |
| 856-259 | Bandwidth | Internet / business phone carrier | 2016 |
| 856-262 | Verizon (local phone) | Local phone company | – |
| 856-318 | Comcast | Internet / business phone carrier | 2008 |
| 856-340 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 856-341 | Verizon Wireless | Mobile carrier | – |
| 856-388 | Fractel | Internet / business phone carrier | 2020 |
| 856-404 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 856-513 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 856-516 | Comcast | Internet / business phone carrier | 2011 |
| 856-562 | AT&T Mobility | Mobile carrier | 2002 |
| 856-606 | Onvoy | Internet / business phone carrier | 2024 |
| 856-629 | Verizon (local phone) | Local phone company | – |
| 856-649 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 856-695 | Onvoy | Internet / business phone carrier | 2026 |
| 856-699 | Fractel | Internet / business phone carrier | 2021 |
| 856-723 | Verizon Wireless | Mobile carrier | 2007 |
| 856-725 | Verizon Wireless | Mobile carrier | 2009 |
| 856-728 | Verizon (local phone) | Local phone company | – |
| 856-740 | Verizon (local phone) | Local phone company | – |
| 856-818 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 856-837 | Aquis Communications | Phone company | – |
| 856-875 | Verizon (local phone) | Local phone company | – |
| 856-885 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 856-889 | Verizon Wireless | Mobile carrier | 2002 |
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.