Area Code 312-801 : Area Code 312-899 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 8xx including 312 area code location map. Major cities such as Chicago, Hinsdale, Wheeling covered within area code 312 8xx are also listed on this page. More area codes, including those outside of Illinois, are on the homepage.

Reverse Lookup Detail for Area Code 312 8xx

Area code 312 covers part of Illinoisstate, covering most of Cook, Du Page counties. It was started on Feb 04, 1994. This region follows (UTC-06:00) timezone. Other popular area codes that belong to Illinois state include 217, 224, 309, 618, 630, 708, 773, 815, 847.

Area Code 312-801 - Area Code 312-899 (Covers 312 8xx xxxx phone numbers)

Area CodeCityCountyPopulationNetwork Operator
312-801ChicagoCook5377 803Source One Wireless
312-802ChicagoCook5377 804Cellco Partnership Dba Verizon Wireless - Il
312-803ChicagoCook5377 805Mci Worldcom Communications, Inc. - Il
312-804ChicagoCook5377 806T-mobile Usa, Inc.
312-805ChicagoCook5377 807Cellco Partnership Dba Verizon Wireless - Il
312-806ChicagoCook5377 808Southwestern Bell Mobile Systems, Llc - Il
312-807ChicagoCook5377 809Ameritech Illinois
312-808ChicagoCook5377 810Ameritech Illinois
312-810ChicagoCook5377 812Southwestern Bell Mobile Systems, Llc - Il
312-812ChicagoCook5377 814Ameritech Illinois
312-813ChicagoCook5377 815Southwestern Bell Mobile Systems, Llc - Il
312-814ChicagoCook5377 816Ameritech Illinois
312-816HinsdaleDu Page904 818Southwestern Bell Mobile Systems, Llc - Il
312-817ChicagoCook5377 819Ameritech Illinois
312-818ChicagoCook5377 820Source One Wireless
312-819ChicagoCook5377 821Ameritech Illinois
312-820ChicagoCook5377 822Arch Wireless Holdings, Inc.
312-821ChicagoCook5377 823Mci Worldcom Communications, Inc. - Il
312-822ChicagoCook5377 824Ameritech Illinois
312-823ChicagoCook5377 825Ameritech Illinois
312-824ChicagoCook5377 826Heartland Communications, Inc.
312-825ChicagoCook5377 827Heartland Communications, Inc.
312-826ChicagoCook5377 828Heartland Communications, Inc.
312-827ChicagoCook5377 829Ameritech Illinois
312-828ChicagoCook5377 830Ameritech Illinois
312-829ChicagoCook5377 831Ameritech Illinois
312-830ChicagoCook5377 832Arch Wireless Holdings, Inc.
312-831ChicagoCook5377 833Ameritech Illinois
312-832ChicagoCook5377 834Ameritech Illinois
312-833ChicagoCook5377 835Cellco Partnership Dba Verizon Wireless - Il
312-834ChicagoCook5377 836Ameritech Illinois
312-835ChicagoCook5377 837Cellco Partnership Dba Verizon Wireless - Il
312-836ChicagoCook5377 838Ameritech Illinois
312-837ChicagoCook5377 839Arch Wireless Holdings, Inc.
312-838ChicagoCook5377 840Map Mobile Communications, Inc.
312-839ChicagoCook5377 841Ameritech Mobile Services, Inc.
312-840ChicagoCook5377 842Ameritech Illinois
312-841ChicagoCook5377 843Southwestern Bell Mobile Systems, Llc - Il
312-842ChicagoCook5377 844Ameritech Illinois
312-844HinsdaleDu Page904 846Southwestern Bell Mobile Systems, Llc - Il
312-845ChicagoCook5377 847Ameritech Illinois
312-846ChicagoCook5377 848Ameritech Illinois
312-848ChicagoCook5377 850Cellco Partnership Dba Verizon Wireless - Il
312-849ChicagoCook5377 851Ameritech Illinois
312-850ChicagoCook5377 852Ameritech Illinois
312-851ChicagoCook5377 853Heartland Communications, Inc.
312-852ChicagoCook5377 854Southwestern Bell Mobile Systems, Llc - Il
312-853ChicagoCook5377 855Ameritech Illinois
312-854ChicagoCook5377 856Rcn Telecom Services Of Illinois, Inc. - Il
312-855ChicagoCook5377 857Ameritech Illinois
312-856ChicagoCook5377 858Ameritech Illinois
312-857ChicagoCook5377 859Ameritech Illinois
312-859ChicagoCook5377 861Cellco Partnership Dba Verizon Wireless - Il
312-860ChicagoCook5377 862Southwestern Bell Mobile Systems, Llc - Il
312-861ChicagoCook5377 863Ameritech Illinois
312-863ChicagoCook5377 865Ovation Communications Of Illinois, Inc.
312-864ChicagoCook5377 866Ameritech Illinois
312-865WheelingCook5377 867Southwestern Bell Mobile Systems, Llc - Il
312-867ChicagoCook5377 869Ameritech Illinois
312-869ChicagoCook5377 871Ameritech Illinois
312-870ChicagoCook5377 872Winstar Communications, Llc - Il
312-873ChicagoCook5377 875Mci Worldcom Communications, Inc. - Il
312-875ChicagoCook5377 877Ameritech Illinois
312-876ChicagoCook5377 878Ameritech Illinois
312-877ChicagoCook5377 879Source One Wireless
312-879ChicagoCook5377 881Ameritech Illinois
312-880ChicagoCook5377 882Ameritech Illinois
312-881ChicagoCook5377 883Ovation Communications Of Illinois, Inc.
312-882ChicagoCook5377 884Cellco Partnership Dba Verizon Wireless - Il
312-884ChicagoCook5377 886Ovation Communications Of Illinois, Inc.
312-886ChicagoCook5377 888Ameritech Illinois
312-887ChicagoCook5377 889Ameritech Illinois
312-890ChicagoCook5377 892Sprint Spectrum L.p.
312-891ChicagoCook5377 893Arch Wireless Holdings, Inc.
312-892ChicagoCook5377 894Focal Communications Corp Of Illinois
312-893ChicagoCook5377 895Focal Communications Corp Of Illinois
312-894ChicagoCook5377 896Mcimetro, Ats, Inc.
312-895ChicagoCook5377 897Focal Communications Corp Of Illinois
312-896ChicagoCook5377 898Focal Communications Corp Of Illinois
312-897ChicagoCook5377 899Source One Wireless
312-898ChicagoCook5377 900Cellco Partnership Dba Verizon Wireless - Il
312-899ChicagoCook5377 901Ameritech Illinois


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312 Area Code

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Illinois Area Codes Directory provides a free area codes directory with detailed information on the various USA area codes, area codes listing, and other area codes phone details. also lists international area codes within the North American Numbering Plan. And you can verify owners of phone numbers using the reverse number lookup service by entering a 10 digit phone number in the top most text box.

312 Area Code Finder

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Illinois Area Code Lookup is an excellent resource for area code lookup and reverse number lookup. Here you'll find area codes, city, county, population & operator list table of area codes within the United States. Also, you can verify owners of phone numbers with full name & address information for background check. For a full list of area codes, visit home page. It provides drilldown for USA area codes and area code location maps.

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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 312-8. You can also search area codes by state, and within the NANP, find country area codes.

Free Area Codes Locator for Illinois

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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 312-8. 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)