Phone numbers in St. Elmo, Illinois
St. Elmo has 3 phone prefixes in area code 618.
Biggest holders: Mcc Telephony, Frontier. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 33%
- Internet / business phone carrier 67%
Every prefix in St. Elmo
Search the first six digits of a number in this list. If it's here, the number started in St. Elmo with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 618-461 | Mcc Telephony | Internet / business phone carrier | 2010 |
| 618-510 | Mcc Telephony | Internet / business phone carrier | 2005 |
| 618-829 | 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.