Phone numbers in Lemont, Illinois
Lemont has 31 phone prefixes in area codes 331, 630.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), Teleport Communications America. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 16%
- Local phone company 42%
- Internet / business phone carrier 42%
Every prefix in Lemont
Search the first six digits of a number in this list. If it's here, the number started in Lemont with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 331-246 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 331-253 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 331-261 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 331-273 | Onvoy | Internet / business phone carrier | 2021 |
| 331-309 | Commio | Internet / business phone carrier | – |
| 331-318 | Bandwidth | Internet / business phone carrier | – |
| 331-325 | Onvoy | Internet / business phone carrier | 2024 |
| 331-426 | TON80 Communications | Internet / business phone carrier | 2022 |
| 331-757 | T-Mobile (including Sprint) | Mobile carrier | 2016 |
| 331-803 | Peerless Network Of Illinois | Internet / business phone carrier | 2013 |
| 630-226 | AT&T (local phone) | Local phone company | – |
| 630-243 | AT&T (local phone) | Local phone company | – |
| 630-252 | AT&T (local phone) | Local phone company | – |
| 630-257 | AT&T (local phone) | Local phone company | – |
| 630-296 | Teleport Communications America | Internet / business phone carrier | – |
| 630-312 | AT&T (local phone) | Local phone company | 2007 |
| 630-343 | Teleport Communications America | Internet / business phone carrier | – |
| 630-378 | AT&T (local phone) | Local phone company | – |
| 630-410 | Teleport Communications America | Internet / business phone carrier | – |
| 630-633 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 630-679 | AT&T (local phone) | Local phone company | – |
| 630-685 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-739 | AT&T (local phone) | Local phone company | – |
| 630-754 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-755 | Teleport Communications America | Internet / business phone carrier | – |
| 630-759 | AT&T (local phone) | Local phone company | – |
| 630-771 | AT&T (local phone) | Local phone company | – |
| 630-783 | AT&T (local phone) | Local phone company | – |
| 630-863 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 630-914 | AT&T (local phone) | Local phone company | 2006 |
| 630-972 | 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.