Phone numbers in Spring Grove, Illinois
Spring Grove has 3 phone prefixes in area codes 779, 815.
Biggest holders: Stratus Networks, Comcast, Frontier. 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 Spring Grove
Search the first six digits of a number in this list. If it's here, the number started in Spring Grove with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 779-286 | Stratus Networks | Phone company | 2020 |
| 815-581 | Comcast | Internet / business phone carrier | 2005 |
| 815-675 | 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.