Phone numbers in Winnetka, Illinois
Winnetka has 13 phone prefixes in area codes 224, 847.
Biggest holders: AT&T (local phone), Onvoy, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 15%
- Local phone company 31%
- Internet / business phone carrier 54%
Every prefix in Winnetka
Search the first six digits of a number in this list. If it's here, the number started in Winnetka with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 224-216 | AT&T Mobility | Mobile carrier | 2009 |
| 224-255 | AT&T Mobility | Mobile carrier | 2011 |
| 224-328 | Onvoy | Internet / business phone carrier | 2020 |
| 224-472 | Onvoy | Internet / business phone carrier | 2021 |
| 224-505 | Onvoy | Internet / business phone carrier | 2014 |
| 847-386 | Teleport Communications America | Internet / business phone carrier | – |
| 847-441 | AT&T (local phone) | Local phone company | – |
| 847-446 | AT&T (local phone) | Local phone company | – |
| 847-501 | AT&T (local phone) | Local phone company | – |
| 847-716 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 847-784 | AT&T (local phone) | Local phone company | – |
| 847-881 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 847-999 | Level 3 (Lumen) | Internet / business phone carrier | – |
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.