Phone numbers in Mendham, New Jersey
Mendham has 7 phone prefixes in area codes 862, 973.
Biggest holders: Bandwidth, Coretel New Jersey, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 14%
- Internet / business phone carrier 71%
- Phone company 14%
Every prefix in Mendham
Search the first six digits of a number in this list. If it's here, the number started in Mendham with the carrier shown. If it isn't, check the New Jersey page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 862-263 | Bandwidth | Internet / business phone carrier | 2014 |
| 862-829 | Coretel New Jersey | Phone company | 2019 |
| 862-858 | Onvoy | Internet / business phone carrier | 2021 |
| 973-370 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 973-531 | Cablevision Lightpath | Internet / business phone carrier | 2001 |
| 973-543 | Verizon (local phone) | Local phone company | – |
| 973-813 | Teleport Communications America | Internet / business phone carrier | – |
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.