Phone numbers in Naperville, Illinois
Naperville has 107 phone prefixes in area codes 331, 630.
Biggest holders: AT&T (local phone), Verizon Wireless, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 40%
- Local phone company 32%
- Internet / business phone carrier 27%
- Phone company 1%
Every prefix in Naperville
Search the first six digits of a number in this list. If it's here, the number started in Naperville with the carrier shown. If it isn't, check the Illinois page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 331-204 | Onvoy | Internet / business phone carrier | 2015 |
| 331-213 | Verizon Wireless | Mobile carrier | 2011 |
| 331-215 | Verizon Wireless | Mobile carrier | 2012 |
| 331-226 | T-Mobile (including Sprint) | Mobile carrier | 2017 |
| 331-229 | Verizon Wireless | Mobile carrier | 2012 |
| 331-231 | AT&T Mobility | Mobile carrier | 2017 |
| 331-237 | MCImetro (Verizon Business) | Internet / business phone carrier | 2017 |
| 331-244 | Onvoy | Internet / business phone carrier | 2017 |
| 331-247 | Vonage America | Internet / business phone carrier | 2018 |
| 331-249 | Onvoy | Internet / business phone carrier | 2018 |
| 331-281 | AT&T (local phone) | Local phone company | 2012 |
| 331-285 | Verizon Wireless | Mobile carrier | 2022 |
| 331-294 | Verizon Wireless | Mobile carrier | 2023 |
| 331-298 | Onvoy | Internet / business phone carrier | 2023 |
| 331-305 | Verizon Wireless | Mobile carrier | 2013 |
| 331-313 | Onvoy | Internet / business phone carrier | 2022 |
| 331-316 | Commio | Internet / business phone carrier | 2024 |
| 331-328 | AT&T Mobility | Mobile carrier | 2024 |
| 331-330 | AT&T Mobility | Mobile carrier | 2008 |
| 331-332 | AT&T Mobility | Mobile carrier | 2008 |
| 331-333 | AT&T Mobility | Mobile carrier | 2008 |
| 331-342 | Verizon Wireless | Mobile carrier | 2025 |
| 331-345 | Fractel | Internet / business phone carrier | 2020 |
| 331-346 | Verizon Wireless | Mobile carrier | 2026 |
| 331-401 | Level 3 (Lumen) | Internet / business phone carrier | 2015 |
| 331-444 | Verizon Wireless | Mobile carrier | 2010 |
| 331-457 | Verizon Wireless | Mobile carrier | 2008 |
| 331-472 | T-Mobile (including Sprint) | Mobile carrier | 2008 |
| 331-529 | Fractel | Internet / business phone carrier | 2019 |
| 331-688 | TON80 Communications | Internet / business phone carrier | 2022 |
| 331-701 | Verizon Wireless | Mobile carrier | 2014 |
| 331-702 | MCImetro (Verizon Business) | Internet / business phone carrier | 2013 |
| 331-814 | T-Mobile (including Sprint) | Mobile carrier | 2015 |
| 630-200 | Verizon Wireless | Mobile carrier | 2006 |
| 630-201 | T-Mobile (including Sprint) | Mobile carrier | 2004 |
| 630-210 | Teleport Communications America | Internet / business phone carrier | – |
| 630-219 | Level 3 (Lumen) | Internet / business phone carrier | 2006 |
| 630-224 | AT&T (local phone) | Local phone company | – |
| 630-245 | AT&T (local phone) | Local phone company | – |
| 630-276 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-281 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-300 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-303 | Verizon Wireless | Mobile carrier | 2004 |
| 630-305 | AT&T (local phone) | Local phone company | – |
| 630-328 | Teleport Communications America | Internet / business phone carrier | – |
| 630-335 | T-Mobile (including Sprint) | Mobile carrier | – |
| 630-352 | Verizon Wireless | Mobile carrier | 2008 |
| 630-355 | AT&T (local phone) | Local phone company | – |
| 630-357 | AT&T (local phone) | Local phone company | – |
| 630-362 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 630-364 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-369 | AT&T (local phone) | Local phone company | – |
| 630-388 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-392 | T-Mobile (including Sprint) | Mobile carrier | 2004 |
| 630-416 | AT&T (local phone) | Local phone company | – |
| 630-420 | AT&T (local phone) | Local phone company | – |
| 630-428 | AT&T (local phone) | Local phone company | – |
| 630-445 | Teleport Communications America | Internet / business phone carrier | – |
| 630-453 | Verizon Wireless | Mobile carrier | 2005 |
| 630-470 | Verizon Wireless | Mobile carrier | 2006 |
| 630-505 | AT&T (local phone) | Local phone company | – |
| 630-527 | AT&T (local phone) | Local phone company | – |
| 630-536 | Teleport Communications America | Internet / business phone carrier | – |
| 630-544 | Windstream (PAETEC) | Internet / business phone carrier | 2001 |
| 630-548 | AT&T (local phone) | Local phone company | – |
| 630-577 | AT&T (local phone) | Local phone company | – |
| 630-579 | AT&T (local phone) | Local phone company | – |
| 630-596 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-605 | AT&T Mobility | Mobile carrier | – |
| 630-615 | First Communications | Phone company | – |
| 630-637 | AT&T (local phone) | Local phone company | – |
| 630-646 | AT&T (local phone) | Local phone company | – |
| 630-649 | AT&T (local phone) | Local phone company | – |
| 630-664 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 630-687 | AT&T Mobility | Mobile carrier | 2004 |
| 630-689 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-696 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 630-699 | AT&T Mobility | Mobile carrier | 2002 |
| 630-713 | AT&T (local phone) | Local phone company | – |
| 630-717 | AT&T (local phone) | Local phone company | – |
| 630-718 | AT&T (local phone) | Local phone company | – |
| 630-730 | AT&T Mobility | Mobile carrier | 2002 |
| 630-742 | T-Mobile (including Sprint) | Mobile carrier | – |
| 630-753 | AT&T (local phone) | Local phone company | – |
| 630-768 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 630-778 | AT&T (local phone) | Local phone company | – |
| 630-780 | Verizon Wireless | Mobile carrier | 2008 |
| 630-798 | AT&T (local phone) | Local phone company | – |
| 630-799 | AT&T (local phone) | Local phone company | – |
| 630-813 | AT&T (local phone) | Local phone company | 2002 |
| 630-839 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 630-848 | AT&T (local phone) | Local phone company | – |
| 630-853 | AT&T Mobility | Mobile carrier | 2001 |
| 630-854 | T-Mobile (including Sprint) | Mobile carrier | 2001 |
| 630-857 | AT&T (local phone) | Local phone company | – |
| 630-864 | T-Mobile (including Sprint) | Mobile carrier | 2005 |
| 630-881 | AT&T Mobility | Mobile carrier | 2001 |
| 630-885 | T-Mobile (including Sprint) | Mobile carrier | 2003 |
| 630-901 | T-Mobile (including Sprint) | Mobile carrier | 2005 |
| 630-904 | AT&T (local phone) | Local phone company | – |
| 630-922 | AT&T (local phone) | Local phone company | – |
| 630-946 | Windstream (PAETEC) | Internet / business phone carrier | – |
| 630-955 | AT&T (local phone) | Local phone company | – |
| 630-961 | AT&T (local phone) | Local phone company | – |
| 630-979 | AT&T (local phone) | Local phone company | – |
| 630-983 | AT&T (local phone) | Local phone company | – |
| 630-995 | AT&T Mobility | Mobile carrier | 2004 |
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.