Phone numbers in Thornton, Illinois
Thornton has 6 phone prefixes in area codes 464, 708.
Biggest holders: Fractel, Teleport Communications America, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 17%
- Internet / business phone carrier 83%
Every prefix in Thornton
Search the first six digits of a number in this list. If it's here, the number started in Thornton with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 464-999 | Fractel | Internet / business phone carrier | 2021 |
| 708-462 | Teleport Communications America | Internet / business phone carrier | 2001 |
| 708-564 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 708-740 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 708-874 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 708-877 | AT&T (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.