Phone numbers in Oglesby, Illinois
Oglesby has 12 phone prefixes in area codes 779, 815.
Biggest holders: AT&T Mobility, Onvoy, Peerless Network Of Illinois. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 67%
- Local phone company 8%
- Internet / business phone carrier 25%
Every prefix in Oglesby
Search the first six digits of a number in this list. If it's here, the number started in Oglesby with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 779-213 | Peerless Network Of Illinois | Internet / business phone carrier | 2013 |
| 779-262 | Onvoy | Internet / business phone carrier | 2018 |
| 779-392 | Onvoy | Internet / business phone carrier | 2024 |
| 815-202 | AT&T Mobility | Mobile carrier | 2008 |
| 815-228 | AT&T Mobility | Mobile carrier | – |
| 815-252 | AT&T Mobility | Mobile carrier | – |
| 815-326 | AT&T Mobility | Mobile carrier | – |
| 815-343 | AT&T Mobility | Mobile carrier | – |
| 815-681 | Verizon Wireless | Mobile carrier | 2010 |
| 815-830 | AT&T Mobility | Mobile carrier | – |
| 815-883 | AT&T (local phone) | Local phone company | – |
| 815-993 | AT&T Mobility | Mobile carrier | 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.