Area Code 312-201 : Area Code 312-299 is your one-stop site for area code lookup, phone number lookup, and free phone number reviews. Following is reverse lookup detail & reviews for area code 312 2xx including 312 area code location map. Major cities such as Chicago, Elgin, Burr Ridge, Bridgeview, Arlington Heights covered within area code 312 2xx are also listed on this page. More area codes, including those outside of Illinois, United States of America, are on the homepage.

Reverse Lookup Detail for Area Code 312 2xx

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.

Verified changes in Area Code 312 2XX

Date ChangedChange Details
Apr 18, 2014Area code 312-265 was introduced on Jul 14, 2006 and subscribers are operational from Apr 18, 2014.
Apr 18, 2014Area code 312-291 was introduced on May 27, 2010 and subscribers are operational from Apr 18, 2014.
Feb 11, 2014Area code 312-217 subscribers are operational from Feb 11, 2014.
Sep 03, 2013Area code 312-292 was introduced on Sep 02, 2011 and subscribers are operational from Sep 03, 2013.
Aug 15, 2013Area code 312-262 was introduced on May 12, 2009 and subscribers are operational from Aug 15, 2013.
Aug 15, 2013Area code 312-267 was introduced on May 12, 2009 and subscribers are operational from Aug 15, 2013.

Area Code 312-201 - Area Code 312-299 (Covers 312 2xx xxxx phone numbers)

Area CodeCityCountyPopulationNetwork Operator
312-201ChicagoCook519,467Ameritech Illinois
312-202-3ChicagoCook519,467Access One Inc - IL
312-202-0ChicagoCook519,467Ameritech Illinois
312-202-2ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-203Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-204-0ChicagoCook519,467Ameritech Illinois
312-204-9ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-204-8Wood DaleCook519,467XO Illinois Inc
312-205ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-206Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-207-9Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-207-0ChicagoCook519,467Ameritech Illinois
312-208Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-209-0ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-210ChicagoCook519,467Ameritech Illinois
312-211275,213Community Support And Referral Services
312-212-0ChicagoCook519,467Ameritech Illinois
312-212-8ChicagoCook519,467Level 3 Communications LLC - IL
312-212-9NapervilleCook519,467Sigecom LLC - IL
312-212-7Wood DaleCook519,467XO Illinois Inc
312-213Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-214ChicagoCook519,467Ameritech Illinois
312-215SchaumburgCook519,467New Cingular Wireless PCS LLC - IL
312-216-9Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-216-2ChicagoCook519,467Access One Inc - IL
312-216-0ChicagoCook519, CLEC LLC - IL
312-216-0ChicagoCook519,467First Communications LLC - IL
312-216-6ChicagoCook519,467Ovation Communications of Illinois Inc
312-216-8ChicagoCook519,467Paetec Communications Inc - IL
312-216-7ChicagoCook519,467T-Mobile USA Inc
312-217BridgeviewCook519,467Sprint Spectrum LP
312-217RockfordCook519,467United States Cellular - IL
312-218Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-219-1Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-219-0ChicagoCook519, CLEC LLC - IL
312-219-9ChicagoCook519,467Level 3 Communications LLC - IL
312-219-7ChicagoCook519,467Teleport Communications America LLC - IL
312-219-6ChicagoCook519,467US Xchange of Illinois LLC dba Choice One Communications
312-220ChicagoCook519,467Ameritech Illinois
312-221-0BridgeviewCook519,467Sprint Spectrum LP
312-222ChicagoCook519,467Ameritech Illinois
312-223ChicagoCook519,467Ameritech Illinois
312-224Arlington HeightsCook519,467Broadwing Communications LLC - IL
312-225ChicagoCook519,467Ameritech Illinois
312-226ChicagoCook519,467Ameritech Illinois
312-227-0ChicagoCook519,467Ameritech Illinois
312-228ChicagoCook519,467Ameritech Illinois
312-229-0ChicagoCook519,467Ameritech Illinois
312-229-0ChicagoCook519,467Level 3 Communications LLC - IL
312-229-7ChicagoCook519,467Ovation Communications of Illinois Inc
312-229-9ChicagoCook519,467Paetec Communications Inc - IL
312-230ChicagoCook519,467Ameritech Illinois
312-231SchaumburgDupage916,924New Cingular Wireless PCS LLC - IL
312-232ChicagoCook519,467American Messaging (AM) Inc
312-233-0ChicagoCook519,467Ameritech Illinois
312-233-2ChicagoCook519,467Level 3 Communications LLC - IL
312-234-0ChicagoCook519,467Ameritech Illinois
312-234-0ChicagoCook519,467Level 3 Communications LLC - IL
312-235-0ChicagoCook519,467Ameritech Illinois
312-235-5ChicagoCook519,467First Communications LLC - IL
312-235-6ChicagoCook519,467Level 3 Communications LLC - IL
312-235-3ChicagoCook519,467Paetec Communications Inc - IL
312-235-9ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-236ChicagoCook519,467Ameritech Illinois
312-237-2ChicagoCook519,467Broadwing Communications LLC - IL
312-237-4ChicagoCook519,467CIMCO Communications Inc - IL
312-237-3ChicagoCook519,467Paetec Communications Inc - IL
312-237-0Hickory HillsCook519,467Cellco Partnership dba Verizon Wireless - IL
312-238Arlington HeightsCook519,467Broadwing Communications LLC - IL
312-239-0ChicagoCook519,467AT&T Local
312-239-2ChicagoCook519,467First Communications LLC - IL
312-239-8ChicagoCook519,467Level 3 Communications LLC - IL
312-239-1ChicagoCook519,467Ovation Communications of Illinois Inc
312-239-7Wood DaleCook519,467XO Illinois Inc
312-240ChicagoCook519,467Ameritech Illinois
312-241-0Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-241-1ChicagoCook519,467Level 3 Communications LLC - IL
312-241-0ChicagoCook519,467T-Mobile USA Inc
312-242-5Arlington HeightsCook519,467Broadwing Communications LLC - IL
312-242-7ChicagoCook519,467Broadwing Communications LLC - IL
312-242-9ChicagoCook519,467First Communications LLC - IL
312-242-0ChicagoCook519,467Teleport Communications America LLC - IL
312-243ChicagoCook519,467Ameritech Illinois
312-244-0ChicagoCook519,467Ameritech Illinois
312-244-9ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-244-4Wood DaleCook519,467XO Illinois Inc
312-245ChicagoCook519,467Ameritech Illinois
312-246-0SchaumburgCook519,467New Cingular Wireless PCS LLC - IL
312-247-0ChicagoCook519,467First Communications LLC - IL
312-249Burr RidgeCook519,467USA Mobility Wireless Inc
312-250Burr RidgeCook519,467USA Mobility Wireless Inc
312-251ChicagoCook519,467Ameritech Illinois
312-252-0ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-252-7ChicagoCook519,467Ameritech Illinois
312-253-0ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-253-3ChicagoCook519,467Paetec Communications Inc - IL
312-253-6ChicagoCook519,467Teleport Communications America LLC - IL
312-254-0ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-254-7ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-254-8Wood DaleCook519,467XO Illinois Inc
312-255ChicagoCook519,467Ameritech Illinois
312-256-0ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-256-3ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-257-8Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-257-0ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-258ChicagoCook519,467Ameritech Illinois
312-259Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-260-0BensenvilleCook519,467MCImetro Access Transmission Services LLC
312-261-0ChicagoCook519,467Broadwing Communications LLC - IL
312-262-8BridgeviewCook519,467Sprint Spectrum LP
312-263ChicagoCook519,467Ameritech Illinois
312-264ChicagoCook519,467Broadwing Communications LLC - IL
312-265-0ChicagoCook519,467Access One Inc - IL
312-265-3ChicagoCook519,467Level 3 Communications LLC - IL
312-266ChicagoCook519,467Ameritech Illinois
312-267-9BridgeviewCook519,467Sprint Spectrum LP
312-267-2ChicagoCook519,467Level 3 Communications LLC - IL
312-268-0Arlington HeightsCook519,467Broadwing Communications LLC - IL
312-269ChicagoCook519,467Ameritech Illinois
312-271Burr RidgeCook519,467USA Mobility Wireless Inc
312-272Burr RidgeCook519,467USA Mobility Wireless Inc
312-273-2Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-273-6ChicagoCook519,467Level 3 Communications LLC - IL
312-273-0ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-274ChicagoCook519,467Ameritech Illinois
312-275ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-276ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-277ChicagoCook519,467Allegiance Telecom of Illinois Inc
312-278-0Arlington HeightsCook519,467Broadwing Communications LLC - IL
312-279BensenvilleCook519,467MCImetro Access Transmission Services LLC
312-280ChicagoCook519,467Ameritech Illinois
312-281-3ChicagoCook519,467Ameritech Illinois
312-282Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-283-0ChicagoCook519,467Global Crossing Local Services Inc - IL
312-284ChicagoCook519,467XO Illinois Inc
312-285-0BridgeviewCook519,467Sprint Spectrum LP
312-285-1ElginCook519,467Cellco Partnership dba Verizon Wireless - IL
312-286Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-287BridgeviewCook519,467Sprint Spectrum LP
312-288-0BensenvilleCook519,467MCImetro Access Transmission Services LLC
312-289Burr RidgeCook519,467USA Mobility Wireless Inc
312-290Burr RidgeCook519,467USA Mobility Wireless Inc
312-291-6Burr RidgeCook519,467New Cingular Wireless PCS LLC - IL
312-291-2ChicagoCook519,467CIMCO Communications Inc - IL
312-291-5ChicagoCook519,467Teleport Communications America LLC - IL
312-292-4ChicagoCook519,467Ameritech Illinois
312-292-5ChicagoCook519,467Ovation Communications of Illinois Inc
312-293ChicagoCook519,467Ameritech Illinois
312-294ChicagoCook519,467Ameritech Illinois
312-295Burr RidgeCook519,467USA Mobility Wireless Inc
312-296BridgeviewCook519,467Sprint Spectrum LP
312-297ChicagoCook519,467Ameritech Illinois
312-298-8ChicagoCook519,467Ameritech Illinois
312-298-0NapervilleCook519,467Sigecom LLC - IL
312-299Burr RidgeCook519,467USA Mobility Wireless Inc

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312 Area Code

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Telephone/Landline Area Codes is a resource of North American telephone area codes. Beyond area code listings, relevant information about each area code is detailed. For example, this page details area code 312-2. You can also search area codes by state, and within the NANP, find country area codes.

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312 Area Code Reviews provides local reviews for phone numbers and aggregates results per area code. It shows you the area code location covered by each area code; for example, the LA area code reveiws covers local business phone numbers area in Los Angeles. This page details area code 312-2. All USA states area codes may be found using

Telephone Area Codes in Illinois

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External links & resources for area code 312 in Illinois

  • CitySites Pages for Illinois (Source: Official CitySites)
  • Wikipedia Article on Area Code 312 (Source: Wikipedia)
  • State Information Resources for Illinois (Source: State Information)