Phone numbers in Lombard, Illinois
Lombard has 50 phone prefixes in area codes 331, 630.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 20%
- Local phone company 34%
- Internet / business phone carrier 44%
- Phone company 2%
Every prefix in Lombard
Search the first six digits of a number in this list. If it's here, the number started in Lombard with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 331-217 | Onvoy | Internet / business phone carrier | 2023 |
| 331-241 | Onvoy | Internet / business phone carrier | – |
| 331-242 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 331-243 | T-Mobile (including Sprint) | Mobile carrier | 2018 |
| 331-267 | Vonage America | Internet / business phone carrier | 2020 |
| 331-277 | AT&T Mobility | Mobile carrier | 2021 |
| 331-307 | T-Mobile (including Sprint) | Mobile carrier | 2014 |
| 331-315 | AT&T Mobility | Mobile carrier | 2016 |
| 331-322 | Onvoy | Internet / business phone carrier | 2024 |
| 331-462 | MCImetro (Verizon Business) | Internet / business phone carrier | 2008 |
| 331-551 | AT&T Mobility | Mobile carrier | 2008 |
| 331-627 | TON80 Communications | Internet / business phone carrier | 2022 |
| 331-899 | Fractel | Internet / business phone carrier | 2020 |
| 630-261 | AT&T (local phone) | Local phone company | – |
| 630-268 | AT&T (local phone) | Local phone company | – |
| 630-282 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-290 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 630-317 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-376 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-396 | Rcn Telecom Services Of Illinios | Phone company | – |
| 630-424 | AT&T (local phone) | Local phone company | – |
| 630-426 | Teleport Communications America | Internet / business phone carrier | – |
| 630-489 | Onvoy | Internet / business phone carrier | – |
| 630-495 | AT&T (local phone) | Local phone company | – |
| 630-519 | Teleport Communications America | Internet / business phone carrier | – |
| 630-576 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 630-599 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-613 | Teleport Communications America | Internet / business phone carrier | – |
| 630-620 | AT&T (local phone) | Local phone company | – |
| 630-627 | AT&T (local phone) | Local phone company | – |
| 630-629 | AT&T (local phone) | Local phone company | – |
| 630-652 | AT&T (local phone) | Local phone company | – |
| 630-656 | T-Mobile (including Sprint) | Mobile carrier | – |
| 630-678 | AT&T (local phone) | Local phone company | – |
| 630-691 | AT&T (local phone) | Local phone company | – |
| 630-693 | AT&T (local phone) | Local phone company | – |
| 630-705 | AT&T (local phone) | Local phone company | – |
| 630-748 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-785 | Teleport Communications America | Internet / business phone carrier | – |
| 630-792 | AT&T (local phone) | Local phone company | – |
| 630-812 | AT&T Mobility | Mobile carrier | 2005 |
| 630-827 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 630-847 | Onvoy | Internet / business phone carrier | 2007 |
| 630-873 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-889 | AT&T (local phone) | Local phone company | – |
| 630-916 | AT&T (local phone) | Local phone company | – |
| 630-925 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-932 | AT&T (local phone) | Local phone company | – |
| 630-935 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 630-953 | 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.