Phone numbers in Clinton, Illinois
Clinton has 5 phone prefixes in area code 217.
Biggest holders: Frontier, T-Mobile (including Sprint), Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 60%
- Internet / business phone carrier 20%
Every prefix in Clinton
Search the first six digits of a number in this list. If it's here, the number started in Clinton with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 217-570 | T-Mobile (including Sprint) | Mobile carrier | – |
| 217-731 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 217-934 | Frontier | Local phone company | – |
| 217-935 | Frontier | Local phone company | – |
| 217-937 | Frontier | 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.