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
312-348 Chicago, IL Cook Landline
312-349 Chicago, IL Cook Cell Number
312-350 Chicago, IL Cook Cell Number
312-351 Chicago, IL Cook Cell Number
312-352 Hinsdale, IL Dupage Cell Number
312-353 Chicago, IL Cook Landline
312-354 Roselle, IL Dupage Cell Number
312-355 Chicago, IL Cook Landline
312-356 Chicago, IL Cook Landline
312-357 Chicago, IL Cook Landline
312-359 Chicago, IL Cook Cell Number
312-360 Chicago, IL Cook Landline
312-361 Chicago, IL Cook Landline
312-362 Chicago, IL Cook Landline
312-363 Chicago, IL Cook Landline
312-364 Chicago, IL Cook Landline
312-365 Chicago, IL Cook Cell Number
312-366 La Grange Park, IL Cook Cell Number
312-367 La Grange Park, IL Cook Cell Number
312-368 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.

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