Area Code 815 - Chicago, IL

Below is the information for Area Code 815
General Information for Area Code 815
Country United States
State/Province Illinois
Major City Chicago
Time Zone Central

Phone directory of numbers beginning with Area Code 815 Prefixes

Prefix Primary City County Phone Type
815-301 Crystal Lake, IL Mchenry Landline
815-302 Joliet, IL Will Cell Number
815-303 Princeton, IL Bureau Cell Number
815-304 Kankakee, IL Kankakee Landline
815-305 Gardner, IL Grundy Landline
815-306 Lockport, IL Will Landline
815-307 Mchenry, IL Mchenry Landline
815-308 Woodstock, IL Mchenry Landline
815-309 Shannon, IL Carroll Landline
815-310 Utica, IL La Salle Landline
815-312 Rockford, IL Winnebago Landline
815-313 Ottawa, IL La Salle Landline
815-314 Manhattan, IL Will Landline
815-315 Rockford, IL Winnebago Landline
815-316 Rockford, IL Winnebago Landline
815-317 Crescent City, IL Iroquois Landline
815-318 Morris, IL Grundy Landline
815-319 Rockford, IL Winnebago Cell Number
815-320 Kankakee, IL Kankakee Cell Number
815-321 Woodstock, IL Mchenry 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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