Area code 331 covers part of Illinoisstate, covering most of Kane, Dupage, Cook, Kendall 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 |
May 21, 2014 | Area code 331-234 will be de-activated on May 21, 2014 for all subscribers. Subscribers of area code 331 can use the overlayed area code 630 from May 21, 2014. |
May 19, 2014 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-256 was assigned on Jul 24, 2013 and is operational from May 19, 2014. |
May 19, 2014 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-209 was assigned on Apr 23, 2014 and is operational from May 19, 2014. |
May 19, 2014 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-207 was assigned on Apr 23, 2014 and is operational from May 19, 2014. |
Apr 19, 2014 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-208 was assigned on Mar 26, 2014 and is operational from Apr 19, 2014. |
Apr 18, 2014 | Area code 630 subscribers are now overlayed with area code 331. Subscriber area code 331-229 was assigned on Nov 08, 2013 and is operational from Apr 18, 2014. |
Area Code | City | County | Population | Network Operator |
331-200-1 | Chicago | Cook | 519,467 | Bandwidth.com CLEC LLC - IL |
331-200-5 | Chicago | Cook | 519,467 | Broadvox-CLEC LLC - IL |
331-200-2 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
331-200-8 | Chicago | Cook | 519,467 | Peerless Network of Illinois LLC - IL |
331-200-6 | Chicago | Cook | 519,467 | Qwest Communications Company LLC |
331-200-0 | Chicago | Cook | 519,467 | T-Mobile USA Inc |
331-201-8 | Buffalo Grove | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
331-201-2 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-201-0 | Elgin | Dupage | 916,924 | Cellco Partnership dba Verizon Wireless - IL |
331-202-0 | Arlington Heights | Dupage | 916,924 | Sprint Spectrum LP |
331-203-0 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
331-204-0 | Chicago | Cook | 519,467 | Broadvox-CLEC LLC - IL |
331-205-6 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
331-205-8 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
331-205-0 | Chicago | Kane | 515,269 | T-Mobile USA Inc |
331-206-0 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
331-207-5 | Chicago | Kendall | 114,736 | Bandwidth.com CLEC LLC - IL |
331-207-3 | Chicago | Kendall | 114,736 | Broadvox-CLEC LLC - IL |
331-207-0 | Chicago | Kendall | 114,736 | Level 3 Communications LLC - IL |
331-207-9 | Chicago | Kendall | 114,736 | Peerless Network of Illinois LLC - IL |
331-208-0 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
331-208-9 | Chicago | Kane | 515,269 | Level 3 Communications LLC - IL |
331-208-7 | Chicago | Kane | 515,269 | XO Illinois Inc |
331-208-8 | Hickory Hills | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-209-2 | Chicago | Dupage | 916,924 | Access One Inc - IL |
331-209-8 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-209-4 | Chicago | Dupage | 916,924 | Cbeyond Communications LLC - IL |
331-209-0 | Chicago | Dupage | 916,924 | Level 3 Communications LLC - IL |
331-209-1 | Chicago | Dupage | 916,924 | Local Access LLC - IL |
331-209-7 | Chicago | Dupage | 916,924 | Qwest Communications Company LLC |
331-210-0 | Chicago | Kane | 515,269 | Broadvox-CLEC LLC - IL |
331-210-0 | Chicago | Kane | 515,269 | Peerless Network of Illinois LLC - IL |
331-210-7 | Chicago | Kane | 515,269 | Qwest Communications Company LLC |
331-210-8 | West Chicago | Kane | 515,269 | New Cingular Wireless PCS LLC - IL |
331-211 | 668,213 | Community Support And Referral Services | ||
331-212-6 | Chicago | Kane | 515,269 | Comcast Phone of Illinois LLC - IL |
331-212-4 | Chicago | Kane | 515,269 | Level 3 Communications LLC - IL |
331-212-9 | Chicago | Kane | 515,269 | Peerless Network of Illinois LLC - IL |
331-212-0 | Elk Grove Village | Kane | 515,269 | MCI Worldcom Communications Inc - IL |
331-212-2 | Hickory Hills | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-213-8 | Buffalo Grove | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
331-213-9 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-213-7 | Chicago | Dupage | 916,924 | Comcast Phone of Illinois LLC - IL |
331-213-0 | Hickory Hills | Dupage | 916,924 | Cellco Partnership dba Verizon Wireless - IL |
331-214-9 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-214-3 | Chicago | Dupage | 916,924 | Broadvox-CLEC LLC - IL |
331-214-4 | Chicago | Dupage | 916,924 | Cbeyond Communications LLC - IL |
331-214-5 | Chicago | Dupage | 916,924 | Level 3 Communications LLC - IL |
331-214-0 | Elgin | Dupage | 916,924 | Cellco Partnership dba Verizon Wireless - IL |
331-214-6 | Oak Brook | Dupage | 916,924 | Teleport Communications America LLC - IL |
331-215-7 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-215-1 | Chicago | Dupage | 916,924 | Cbeyond Communications LLC - IL |
331-215-6 | Chicago | Dupage | 916,924 | Level 3 Communications LLC - IL |
331-215-9 | Chicago | Dupage | 916,924 | Peerless Network of Illinois LLC - IL |
331-215-0 | Hickory Hills | Dupage | 916,924 | Cellco Partnership dba Verizon Wireless - IL |
331-216-0 | Burr Ridge | Kendall | 114,736 | New Cingular Wireless PCS LLC - IL |
331-216-2 | Chicago | Kendall | 114,736 | Level 3 Communications LLC - IL |
331-216-1 | Chicago | Kendall | 114,736 | Peerless Network of Illinois LLC - IL |
331-218-3 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-218-0 | Chicago | Dupage | 916,924 | T-Mobile USA Inc |
331-218-4 | Elmhurst | Dupage | 916,924 | Comcast Phone of Illinois LLC - IL |
331-220-0 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
331-220-5 | Hickory Hills | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-221-0 | Elmhurst | Dupage | 916,924 | Ameritech Illinois |
331-222-6 | Buffalo Grove | Kane | 515,269 | New Cingular Wireless PCS LLC - IL |
331-222-9 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
331-222-8 | Elgin | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-222-0 | Northbrook | Kane | 515,269 | Denali Spectrum License LLC |
331-223-5 | Buffalo Grove | Kane | 515,269 | New Cingular Wireless PCS LLC - IL |
331-223-4 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
331-223-9 | Chicago | Kane | 515,269 | Peerless Network of Illinois LLC - IL |
331-223-7 | Elgin | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-223-0 | Northbrook | Kane | 515,269 | Denali Spectrum License LLC |
331-223-8 | West Chicago | Kane | 515,269 | New Cingular Wireless PCS LLC - IL |
331-225-0 | Arlington Heights | Dupage | 916,924 | Sprint Spectrum LP |
331-225-4 | Chicago | Dupage | 916,924 | Broadvox-CLEC LLC - IL |
331-225-3 | Chicago | Dupage | 916,924 | Comcast Phone of Illinois LLC - IL |
331-228-0 | Chicago | Kane | 515,269 | Ovation Communications of Illinois Inc |
331-228-8 | Elgin | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-229-7 | Aurora | Dupage | 916,924 | Sprint Spectrum LP |
331-229-8 | Chicago | Dupage | 916,924 | Comcast Phone of Illinois LLC - IL |
331-229-4 | Chicago | Dupage | 916,924 | Qwest Communications Company LLC |
331-229-0 | Hickory Hills | Dupage | 916,924 | Cellco Partnership dba Verizon Wireless - IL |
331-229-5 | Oak Brook | Dupage | 916,924 | Teleport Communications America LLC - IL |
331-234-8 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
331-234-5 | Chicago | Kane | 515,269 | Level 3 Communications LLC - IL |
331-234-0 | Hickory Hills | Kane | 515,269 | Cellco Partnership dba Verizon Wireless - IL |
331-240-9 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-240-2 | Chicago | Dupage | 916,924 | Comcast Phone of Illinois LLC - IL |
331-240-0 | Chicago | Dupage | 916,924 | Peerless Network of Illinois LLC - IL |
331-240-8 | Chicago | Dupage | 916,924 | T-Mobile USA Inc |
331-240-0 | West Chicago | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
331-245-0 | Chicago | Cook | 519,467 | T-Mobile USA Inc |
331-248-7 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
331-248-6 | Chicago | Kane | 515,269 | Broadvox-CLEC LLC - IL |
331-248-0 | Chicago | Kane | 515,269 | Comcast Phone of Illinois LLC - IL |
331-248-9 | Chicago | Kane | 515,269 | Peerless Network of Illinois LLC - IL |
331-250-7 | Chicago | Kane | 515,269 | Qwest Communications Company LLC |
331-250-0 | Chicago | Kane | 515,269 | T-Mobile USA Inc |
331-251-9 | Buffalo Grove | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
331-251-8 | Chicago | Dupage | 916,924 | Bandwidth.com CLEC LLC - IL |
331-251-2 | Chicago | Dupage | 916,924 | XO Illinois Inc |
331-256-9 | Chicago | Kane | 515,269 | Bandwidth.com CLEC LLC - IL |
331-256-6 | Chicago | Kane | 515,269 | Comcast Phone of Illinois LLC - IL |
331-262-0 | Aurora | Kane | 515,269 | Sprint Spectrum LP |
331-281-0 | Chicago | Dupage | 916,924 | Comcast Phone of Illinois LLC - IL |
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