Phone numbers in Crescentcy, Illinois
Crescentcy has 8 phone prefixes in area codes 779, 815.
Biggest holders: Level 3 (Lumen), AT&T Enterprises, Onvoy. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 12%
- Local phone company 12%
- Internet / business phone carrier 38%
- Phone company 38%
Every prefix in Crescentcy
Search the first six digits of a number in this list. If it's here, the number started in Crescentcy with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 779-235 | AT&T Enterprises | Phone company | 2011 |
| 779-338 | Onvoy | Internet / business phone carrier | 2021 |
| 815-317 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 815-330 | First Communications | Phone company | – |
| 815-377 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 815-383 | AT&T Mobility | Mobile carrier | – |
| 815-644 | Rcn Telecom Services Of Illinios | Phone company | – |
| 815-683 | 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.