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Area Code 312 - Chicago, IL

Below is the information for Area Code 312
General Information for Area Code 312
Country United States
State/Province Illinois
Major City Chicago
Time Zone Central (UTC-06:00)

Phone directory of numbers beginning with Area Code 312 Prefixes

Prefix Primary City County Phone Type
312-780 Chicago, IL Cook Landline
312-781 Chicago, IL Cook Landline
312-782 Chicago, IL Cook Landline
312-784 Chicago, IL Cook Landline
312-786 Chicago, IL Cook Landline
312-787 Chicago, IL Cook Landline
312-788 Chicago, IL Cook Landline
312-789 Chicago, IL Cook Landline
312-790 Chicago, IL Cook Cell Number
312-791 Chicago, IL Cook Landline
312-793 Chicago, IL Cook Landline
312-794 Chicago, IL Cook Landline
312-795 Chicago, IL Cook Landline
312-797 Chicago, IL Cook Landline
312-798 Chicago, IL Cook Landline
312-799 Chicago, IL Cook Landline
312-800 Chicago, IL Cook Landline
312-801 Chicago, IL Cook Cell Number
312-802 Chicago, IL Cook Cell Number
312-803 Chicago, IL Cook Landline
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Location Details

Area code is a type of numbering scheme used in telecommunication. It divides the territories of its member countries, the code is a three-digit code. The digits 0 and 1 applied for central office codes. Other digits were applied into geographic areas of the service territory.

  • 200: easily recognizable code (ERC)
  • 201: New Jersey
  • 202: Washington, D.C.
  • 203: Connecticut
    • and so on.

If you want to get more informatons of the areacode, Input an areacode into the above search area, get what you want.