Phone numbers in Chatham, Illinois
Chatham has 6 phone prefixes in area codes 217, 447.
Biggest holders: AT&T Mobility, Frontier, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 33%
- Local phone company 17%
- Internet / business phone carrier 50%
Every prefix in Chatham
Search the first six digits of a number in this list. If it's here, the number started in Chatham with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 217-319 | AT&T Mobility | Mobile carrier | 2017 |
| 217-483 | Frontier | Local phone company | – |
| 217-697 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 217-860 | AT&T Mobility | Mobile carrier | 2020 |
| 447-231 | Commio | Internet / business phone carrier | 2022 |
| 447-466 | TON80 Communications | Internet / business phone carrier | 2022 |
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.