Phone numbers in Cortland, New York
Cortland has 23 phone prefixes in area code 607.
Biggest holders: Verizon (local phone), Windstream (PAETEC), T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 30%
- Local phone company 26%
- Internet / business phone carrier 30%
- Phone company 13%
Every prefix in Cortland
Search the first six digits of a number in this list. If it's here, the number started in Cortland with the carrier shown. If it isn't, check the New York page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 607-218 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 607-250 | Tc Systems | Phone company | – |
| 607-261 | T-Mobile (including Sprint) | Mobile carrier | – |
| 607-283 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 607-289 | Onvoy | Internet / business phone carrier | – |
| 607-299 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 607-310 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 607-344 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 607-345 | AT&T Mobility | Mobile carrier | – |
| 607-402 | Stratus Networks | Phone company | 2021 |
| 607-423 | Verizon Wireless | Mobile carrier | – |
| 607-428 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 607-543 | MetroPCS (T-Mobile) | Mobile carrier | – |
| 607-591 | Verizon Wireless | Mobile carrier | – |
| 607-597 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 607-605 | Northland Networks | Phone company | – |
| 607-662 | Verizon (local phone) | Local phone company | – |
| 607-717 | Verizon (local phone) | Local phone company | – |
| 607-745 | AT&T Mobility | Mobile carrier | – |
| 607-749 | Verizon (local phone) | Local phone company | – |
| 607-753 | Verizon (local phone) | Local phone company | – |
| 607-756 | Verizon (local phone) | Local phone company | – |
| 607-758 | Verizon (local phone) | Local phone company | – |
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.