Area code 331 covers part of Illinoisstate, covering most of Dupage, Kane counties. It was started on Oct 07, 2007. This region follows US/Central + Daylight Savings timezone. Other popular area codes that belong to Illinois state include 217, 224, 309, 312, 618, 630, 708, 773, 779, 815, 847, 872.
| Date Changed | Change Details |
| Oct 24, 2013 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-625 was assigned on Aug 10, 2010 and is operational from Oct 24, 2013. |
| Nov 05, 2012 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-643 was assigned on Sep 21, 2007 and is operational from Nov 05, 2012. |
| Nov 05, 2012 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-645 was assigned on Nov 06, 2007 and is operational from Nov 05, 2012. |
| Aug 29, 2011 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-642 was assigned on Aug 17, 2011 and is operational from Aug 29, 2011. |
| Area Code | City | County | Population | Network Operator |
| 331-611 | 561,613 | Telco Repair Service | ||
| 331-625-5 | Buffalo Grove | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
| 331-625-9 | Burr Ridge | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
| 331-625-8 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
| 331-625-0 | Elgin | Dupage | 916,924 | Cellco Partnership dba Verizon Wireless - IL |
| 331-642-9 | Arlington Heights | Dupage | 916,924 | Sprint Spectrum LP |
| 331-642-0 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
| 331-642-6 | Chicago | Dupage | 916,924 | CIMCO Communications Inc - IL |
| 331-643-0 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
| 331-643-6 | Chicago | Kane | 515,269 | T-Mobile USA Inc |
| 331-643-4 | Elk Grove Village | Kane | 515,269 | MCI Worldcom Communications Inc - IL |
| 331-645-0 | Arlington Heights | Dupage | 916,924 | Sprint Spectrum LP |
| 331-684-0 | Arlington Heights | Kane | 515,269 | Broadwing Communications LLC - IL |
| 331-684-1 | Chicago | Kane | 515,269 | Access One Inc - IL |
| 331-684-8 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
| 331-684-6 | Chicago | Kane | 515,269 | Global Crossing Local Services Inc - IL |
| 331-684-9 | Chicago | Kane | 515,269 | Paetec Communications Inc - IL |
| 331-684-5 | Chicago | Kane | 515,269 | T-Mobile USA Inc |
| 331-684-0 | Naperville | Kane | 515,269 | Sigecom LLC - IL |
| 331-684-4 | Oak Brook | Kane | 515,269 | YMax Communications Corporation - IL |
| No reviews yet. |
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