Phone numbers in Warrenville, Illinois
Warrenville has 11 phone prefixes in area codes 331, 630.
Biggest holders: Teleport Communications America, Level 3 (Lumen), AT&T (local phone). This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 18%
- Internet / business phone carrier 82%
Every prefix in Warrenville
Search the first six digits of a number in this list. If it's here, the number started in Warrenville with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 331-252 | Teleport Communications America | Internet / business phone carrier | 2016 |
| 331-888 | Peerless Network Of Illinois | Internet / business phone carrier | 2010 |
| 630-225 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-393 | AT&T (local phone) | Local phone company | – |
| 630-447 | Level 3 (Lumen) | Internet / business phone carrier | 2006 |
| 630-604 | Onvoy | Internet / business phone carrier | – |
| 630-657 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 630-658 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-791 | Teleport Communications America | Internet / business phone carrier | – |
| 630-821 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-836 | AT&T (local phone) | Local phone company | – |
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.