Area code 312 covers part of Illinoisstate, covering most of Cook, Dupage counties. It was started on Jan 01, 2000. This region follows US/Central + Daylight Savings timezone. Other popular area codes that belong to Illinois state include 217, 224, 309, 331, 618, 630, 708, 773, 779, 815, 847, 872.
Date Changed | Change Details |
Apr 18, 2014 | Area code 312-265 was introduced on Jul 14, 2006 and subscribers are operational from Apr 18, 2014. |
Apr 18, 2014 | Area code 312-291 was introduced on May 27, 2010 and subscribers are operational from Apr 18, 2014. |
Feb 11, 2014 | Area code 312-217 subscribers are operational from Feb 11, 2014. |
Sep 03, 2013 | Area code 312-292 was introduced on Sep 02, 2011 and subscribers are operational from Sep 03, 2013. |
Aug 15, 2013 | Area code 312-262 was introduced on May 12, 2009 and subscribers are operational from Aug 15, 2013. |
Aug 15, 2013 | Area code 312-267 was introduced on May 12, 2009 and subscribers are operational from Aug 15, 2013. |
Area Code | City | County | Population | Network Operator |
312-201 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-202-3 | Chicago | Cook | 519,467 | Access One Inc - IL |
312-202-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-202-2 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-203 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-204-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-204-9 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-204-8 | Wood Dale | Cook | 519,467 | XO Illinois Inc |
312-205 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-206 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-207-9 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-207-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-208 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-209-0 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-210 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-211 | 987,213 | Community Support And Referral Services | ||
312-212-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-212-8 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-212-9 | Naperville | Cook | 519,467 | Sigecom LLC - IL |
312-212-7 | Wood Dale | Cook | 519,467 | XO Illinois Inc |
312-213 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-214 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-215 | Schaumburg | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-216-9 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-216-2 | Chicago | Cook | 519,467 | Access One Inc - IL |
312-216-0 | Chicago | Cook | 519,467 | Bandwidth.com CLEC LLC - IL |
312-216-0 | Chicago | Cook | 519,467 | First Communications LLC - IL |
312-216-6 | Chicago | Cook | 519,467 | Ovation Communications of Illinois Inc |
312-216-8 | Chicago | Cook | 519,467 | Paetec Communications Inc - IL |
312-216-7 | Chicago | Cook | 519,467 | T-Mobile USA Inc |
312-217 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-217 | Rockford | Cook | 519,467 | United States Cellular - IL |
312-218 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-219-1 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-219-0 | Chicago | Cook | 519,467 | Bandwidth.com CLEC LLC - IL |
312-219-9 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-219-7 | Chicago | Cook | 519,467 | Teleport Communications America LLC - IL |
312-219-6 | Chicago | Cook | 519,467 | US Xchange of Illinois LLC dba Choice One Communications |
312-220 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-221-0 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-222 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-223 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-224 | Arlington Heights | Cook | 519,467 | Broadwing Communications LLC - IL |
312-225 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-226 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-227-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-228 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-229-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-229-0 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-229-7 | Chicago | Cook | 519,467 | Ovation Communications of Illinois Inc |
312-229-9 | Chicago | Cook | 519,467 | Paetec Communications Inc - IL |
312-230 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-231 | Schaumburg | Dupage | 916,924 | New Cingular Wireless PCS LLC - IL |
312-232 | Chicago | Cook | 519,467 | American Messaging (AM) Inc |
312-233-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-233-2 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-234-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-234-0 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-235-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-235-5 | Chicago | Cook | 519,467 | First Communications LLC - IL |
312-235-6 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-235-3 | Chicago | Cook | 519,467 | Paetec Communications Inc - IL |
312-235-9 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-236 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-237-2 | Chicago | Cook | 519,467 | Broadwing Communications LLC - IL |
312-237-4 | Chicago | Cook | 519,467 | CIMCO Communications Inc - IL |
312-237-3 | Chicago | Cook | 519,467 | Paetec Communications Inc - IL |
312-237-0 | Hickory Hills | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-238 | Arlington Heights | Cook | 519,467 | Broadwing Communications LLC - IL |
312-239-0 | Chicago | Cook | 519,467 | AT&T Local |
312-239-2 | Chicago | Cook | 519,467 | First Communications LLC - IL |
312-239-8 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-239-1 | Chicago | Cook | 519,467 | Ovation Communications of Illinois Inc |
312-239-7 | Wood Dale | Cook | 519,467 | XO Illinois Inc |
312-240 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-241-0 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-241-1 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-241-0 | Chicago | Cook | 519,467 | T-Mobile USA Inc |
312-242-5 | Arlington Heights | Cook | 519,467 | Broadwing Communications LLC - IL |
312-242-7 | Chicago | Cook | 519,467 | Broadwing Communications LLC - IL |
312-242-9 | Chicago | Cook | 519,467 | First Communications LLC - IL |
312-242-0 | Chicago | Cook | 519,467 | Teleport Communications America LLC - IL |
312-243 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-244-0 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-244-9 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-244-4 | Wood Dale | Cook | 519,467 | XO Illinois Inc |
312-245 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-246-0 | Schaumburg | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-247-0 | Chicago | Cook | 519,467 | First Communications LLC - IL |
312-249 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-250 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-251 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-252-0 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-252-7 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-253-0 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-253-3 | Chicago | Cook | 519,467 | Paetec Communications Inc - IL |
312-253-6 | Chicago | Cook | 519,467 | Teleport Communications America LLC - IL |
312-254-0 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-254-7 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-254-8 | Wood Dale | Cook | 519,467 | XO Illinois Inc |
312-255 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-256-0 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-256-3 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-257-8 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-257-0 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-258 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-259 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-260-0 | Bensenville | Cook | 519,467 | MCImetro Access Transmission Services LLC |
312-261-0 | Chicago | Cook | 519,467 | Broadwing Communications LLC - IL |
312-262-8 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-263 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-264 | Chicago | Cook | 519,467 | Broadwing Communications LLC - IL |
312-265-0 | Chicago | Cook | 519,467 | Access One Inc - IL |
312-265-3 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-266 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-267-9 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-267-2 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-268-0 | Arlington Heights | Cook | 519,467 | Broadwing Communications LLC - IL |
312-269 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-271 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-272 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-273-2 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-273-6 | Chicago | Cook | 519,467 | Level 3 Communications LLC - IL |
312-273-0 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-274 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-275 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-276 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-277 | Chicago | Cook | 519,467 | Allegiance Telecom of Illinois Inc |
312-278-0 | Arlington Heights | Cook | 519,467 | Broadwing Communications LLC - IL |
312-279 | Bensenville | Cook | 519,467 | MCImetro Access Transmission Services LLC |
312-280 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-281-3 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-282 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-283-0 | Chicago | Cook | 519,467 | Global Crossing Local Services Inc - IL |
312-284 | Chicago | Cook | 519,467 | XO Illinois Inc |
312-285-0 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-285-1 | Elgin | Cook | 519,467 | Cellco Partnership dba Verizon Wireless - IL |
312-286 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-287 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-288-0 | Bensenville | Cook | 519,467 | MCImetro Access Transmission Services LLC |
312-289 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-290 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-291-6 | Burr Ridge | Cook | 519,467 | New Cingular Wireless PCS LLC - IL |
312-291-2 | Chicago | Cook | 519,467 | CIMCO Communications Inc - IL |
312-291-5 | Chicago | Cook | 519,467 | Teleport Communications America LLC - IL |
312-292-4 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-292-5 | Chicago | Cook | 519,467 | Ovation Communications of Illinois Inc |
312-293 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-294 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-295 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
312-296 | Bridgeview | Cook | 519,467 | Sprint Spectrum LP |
312-297 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-298-8 | Chicago | Cook | 519,467 | Ameritech Illinois |
312-298-0 | Naperville | Cook | 519,467 | Sigecom LLC - IL |
312-299 | Burr Ridge | Cook | 519,467 | USA Mobility Wireless Inc |
No reviews yet. |
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