Phone numbers in Round Lake, Illinois
Round Lake has 17 phone prefixes in area codes 224, 847.
Biggest holders: T-Mobile (including Sprint), AT&T (local phone), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 35%
- Local phone company 18%
- Internet / business phone carrier 47%
Every prefix in Round Lake
Search the first six digits of a number in this list. If it's here, the number started in Round Lake with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 224-270 | MCImetro (Verizon Business) | Internet / business phone carrier | 2001 |
| 224-308 | T-Mobile (including Sprint) | Mobile carrier | 2012 |
| 224-338 | Comcast | Internet / business phone carrier | 2006 |
| 224-390 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 224-473 | MCImetro (Verizon Business) | Internet / business phone carrier | 2002 |
| 224-502 | Onvoy | Internet / business phone carrier | 2023 |
| 224-540 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 224-577 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 224-757 | Comcast | Internet / business phone carrier | 2005 |
| 224-814 | T-Mobile (including Sprint) | Mobile carrier | 2013 |
| 224-818 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 224-933 | Fractel | Internet / business phone carrier | 2019 |
| 847-201 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 847-270 | AT&T (local phone) | Local phone company | – |
| 847-546 | AT&T (local phone) | Local phone company | – |
| 847-740 | AT&T (local phone) | Local phone company | – |
| 847-886 | Level 3 (Lumen) | Internet / business phone carrier | 2005 |
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.