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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
312-390 Chicago, IL Cook Cell Number
312-391 Chicago, IL Cook Cell Number
312-393 Chicago, IL Cook Cell Number
312-394 Chicago, IL Cook Landline
312-395 Chicago, IL Cook Landline
312-396 Chicago, IL Cook Landline
312-397 Chicago, IL Cook Landline
312-398 Chicago, IL Cook Cell Number
312-399 Chicago, IL Cook Cell Number
312-400 Chicago, IL Cook Cell Number
312-401 Chicago, IL Cook Cell Number
312-402 Chicago, IL Cook Cell Number
312-403 La Grange Park, IL Cook Cell Number
312-404 Chicago, IL Cook Cell Number
312-405 Chicago, IL Cook Cell Number
312-406 Wheeling, IL Cook Cell Number
312-407 Chicago, IL Cook Landline
312-408 Chicago, IL Cook Landline
312-409 Chicago, IL Cook Landline
312-410 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.