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
312-974 Chicago, IL Cook Landline
312-977 Chicago, IL Cook Landline
312-978 Chicago, IL Cook Cell Number
312-979 Chicago, IL Cook Cell Number
312-980 Chicago, IL Cook Landline
312-981 Chicago, IL Cook Landline
312-983 Chicago, IL Cook Landline
312-984 Chicago, IL Cook Landline
312-985 Chicago, IL Cook Landline
312-986 Chicago, IL Cook Landline
312-987 Chicago, IL Cook Landline
312-988 Chicago, IL Cook Landline
312-990 Hinsdale, IL Dupage Cell Number
312-991 Wheeling, IL Cook Cell Number
312-992 Chicago, IL Cook Landline
312-993 Chicago, IL Cook Landline
312-994 Chicago, IL Cook Landline
312-996 Chicago, IL Cook Landline
312-997 Chicago, IL Cook Landline
312-999 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.