Phone numbers in Lanark, Illinois
Lanark has 5 phone prefixes in area codes 779, 815.
Biggest holders: Telnyx, Csc Wireless, Frontier. 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 40%
- Phone company 20%
Every prefix in Lanark
Search the first six digits of a number in this list. If it's here, the number started in Lanark with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 779-266 | Telnyx | Internet / business phone carrier | 2019 |
| 779-271 | Csc Wireless | Mobile carrier | 2020 |
| 815-493 | Frontier | Local phone company | – |
| 815-551 | Onvoy | Internet / business phone carrier | 2018 |
| 815-952 | Aero North Communications | Phone company | 2006 |
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.