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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
312-223 Chicago, IL Cook Landline
312-224 Chicago, IL Cook Landline
312-225 Chicago, IL Cook Landline
312-226 Chicago, IL Cook Landline
312-227 Chicago, IL Cook Landline
312-228 Chicago, IL Cook Landline
312-229 Chicago, IL Cook Landline
312-230 Chicago, IL Cook Landline
312-231 Roselle, IL Dupage Cell Number
312-232 Chicago, IL Cook Cell Number
312-233 Chicago, IL Cook Landline
312-234 Chicago, IL Cook Landline
312-235 Chicago, IL Cook Landline
312-236 Chicago, IL Cook Landline
312-237 Chicago, IL Cook Cell Number
312-238 Chicago, IL Cook Landline
312-239 Chicago, IL Cook Landline
312-240 Chicago, IL Cook Landline
312-241 Chicago, IL Cook Cell Number
312-242 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.