Phone numbers in Spring Bay, Illinois
Spring Bay has 4 phone prefixes in area code 309.
Biggest holders: Bandwidth, Stratus Networks, AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 25%
- Internet / business phone carrier 25%
- Phone company 50%
Every prefix in Spring Bay
Search the first six digits of a number in this list. If it's here, the number started in Spring Bay with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 309-204 | Bandwidth | Internet / business phone carrier | 2017 |
| 309-701 | Stratus Networks | Phone company | 2020 |
| 309-822 | AT&T (local phone) | Local phone company | – |
| 309-889 | AT&T Enterprises | Phone company | 2006 |
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.