Phone numbers in St. Joseph, Illinois
St. Joseph has 3 phone prefixes in area code 217.
Biggest holders: AT&T Enterprises, AT&T (local phone), Peerless Network Of Illinois. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 33%
- Phone company 33%
Every prefix in St. Joseph
Search the first six digits of a number in this list. If it's here, the number started in St. Joseph with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 217-207 | AT&T Enterprises | Phone company | 2011 |
| 217-469 | AT&T (local phone) | Local phone company | – |
| 217-907 | Peerless Network Of Illinois | Internet / business phone carrier | 2019 |
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.