Phone numbers in Lake Forest, Illinois
Lake Forest has 27 phone prefixes in area codes 224, 847.
Biggest holders: AT&T (local phone), Teleport Communications America, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 11%
- Local phone company 48%
- Internet / business phone carrier 41%
Every prefix in Lake Forest
Search the first six digits of a number in this list. If it's here, the number started in Lake Forest with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 224-212 | AT&T (local phone) | Local phone company | 2003 |
| 224-271 | Teleport Communications America | Internet / business phone carrier | 2016 |
| 224-317 | Teleport Communications America | Internet / business phone carrier | 2019 |
| 224-332 | Teleport Communications America | Internet / business phone carrier | 2020 |
| 224-436 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 224-516 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 224-544 | AT&T (local phone) | Local phone company | 2007 |
| 224-552 | AT&T (local phone) | Local phone company | 2006 |
| 224-706 | Bandwidth | Internet / business phone carrier | 2014 |
| 224-768 | TON80 Communications | Internet / business phone carrier | 2022 |
| 224-880 | AT&T (local phone) | Local phone company | 2011 |
| 847-219 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 847-234 | AT&T (local phone) | Local phone company | – |
| 847-235 | Teleport Communications America | Internet / business phone carrier | – |
| 847-283 | AT&T (local phone) | Local phone company | – |
| 847-295 | AT&T (local phone) | Local phone company | – |
| 847-457 | Teleport Communications America | Internet / business phone carrier | – |
| 847-482 | AT&T (local phone) | Local phone company | – |
| 847-500 | Onvoy | Internet / business phone carrier | – |
| 847-535 | AT&T (local phone) | Local phone company | – |
| 847-574 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 847-582 | AT&T (local phone) | Local phone company | – |
| 847-604 | AT&T (local phone) | Local phone company | – |
| 847-615 | AT&T (local phone) | Local phone company | – |
| 847-735 | AT&T (local phone) | Local phone company | – |
| 847-739 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 847-810 | 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.