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
312-201 Chicago, IL Cook Landline
312-202 Chicago, IL Cook Landline
312-203 Chicago, IL Cook Cell Number
312-204 Chicago, IL Cook Landline
312-205 Chicago, IL Cook Landline
312-206 Chicago, IL Cook Cell Number
312-207 Chicago, IL Cook Landline
312-208 Chicago, IL Cook Cell Number
312-209 Northbrook, IL Cook Cell Number
312-212 Chicago, IL Cook Landline
312-213 Chicago, IL Cook Cell Number
312-214 Chicago, IL Cook Landline
312-215 Wheeling, IL Cook Cell Number
312-216 Chicago, IL Cook Landline
312-217 Chicago, IL Cook Cell Number
312-218 Chicago, IL Cook Cell Number
312-219 Chicago, IL Cook Cell Number
312-220 Chicago, IL Cook Landline
312-221 Chicago, IL Cook Cell Number
312-222 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.