Area code 331 covers part of Illinoisstate, covering most of Dupage, Cook 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 |
| Feb 10, 2014 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-888 was assigned on Jan 14, 2014 and is operational from Feb 10, 2014. |
| Oct 24, 2013 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-826 was assigned on Aug 13, 2010 and is operational from Oct 24, 2013. |
| Sep 26, 2013 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-803 was assigned on Aug 27, 2013 and is operational from Sep 26, 2013. |
| Area Code | City | County | Population | Network Operator |
| 331-803-2 | Chicago | Cook | 519,467 | Paetec Communications Inc - IL |
| 331-803-0 | Chicago | Cook | 519,467 | Peerless Network of Illinois LLC - IL |
| 331-803-7 | Chicago | Cook | 519,467 | Qwest Communications Company LLC |
| 331-803-8 | Elgin | Cook | 519,467 | T-Mobile USA Inc |
| 331-803-3 | Elk Grove Village | Cook | 519,467 | MCI Worldcom Communications Inc - IL |
| 331-803-6 | Oak Brook | Cook | 519,467 | Teleport Communications America LLC - IL |
| 331-811 | 185,813 | One Call Services-Pipeline And Utility Safety | ||
| 331-826-0 | Arlington Heights | Dupage | 916,924 | Sprint Spectrum LP |
| 331-826-3 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
| 331-826-0 | Chicago | Dupage | 916,924 | Level 3 Communications LLC - IL |
| 331-826-1 | Chicago | Dupage | 916,924 | US Xchange of Illinois LLC dba Choice One Communications |
| 331-888-3 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
| 331-888-0 | Chicago | Dupage | 916,924 | Peerless Network of Illinois LLC - IL |
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