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
815-322 Mchenry, IL Mchenry Landline
815-323 Belvidere, IL Boone Landline
815-324 Ottawa, IL La Salle Landline
815-325 Joliet, IL Will Cell Number
815-326 Oglesby, IL La Salle Cell Number
815-327 Plainfield, IL Will Landline
815-328 Lockport, IL Will Landline
815-329 Rockford, IL Winnebago Landline
815-330 Crescent City, IL Iroquois Landline
815-331 Mchenry, IL Mchenry Landline
815-332 Cherry Valley, IL Winnebago Landline
815-333 Woodstock, IL Mchenry Landline
815-334 Woodstock, IL Mchenry Landline
815-335 Winnebago, IL Winnebago Landline
815-336 Milledgeville, IL Carroll Landline
815-337 Woodstock, IL Mchenry Landline
815-338 Woodstock, IL Mchenry Landline
815-339 Granville, IL Putnam Landline
815-340 La Moille, IL Bureau Landline
815-341 Joliet, IL Will Cell Number
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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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