815 Area Code

Area code 815 covers northeastern Illinois, except Chicago and the surrounding suburbs. It is overlaid by area code 779. 

What is the 815 Area code?

The 815 area code was created on December 1, 1997. It covers most of central and northern Illinois including Chicago, Aurora, Elgin, Joliet, Naperville, Peoria, Rockford, Schaumburg, St. Charles, Springfield, Westmont, Wheaton, Winfield, Woodstock, and other smaller cities in between. The 815 area code does not cover any part of Cook County or Will County (Chicago).


The history of the 815 in Pennsylvania begins with the original assignment of telephone numbers to local exchange areas (LEAs) on October 1, 1947. The first number was assigned to the Pittsburgh area and consisted of a single digit followed by three digits. This initial numbering plan was based upon the boundaries of the Bell System’s operating companies at that time.

Area code 815

In 1952, the Bell System was divided into seven Regional Operating Companies (ROCs), each responsible for providing service within its designated region. Each ROC was further subdivided into Local Access Transport Areas (LATAs), which were responsible for assigning specific telephone numbers to individual exchanges within their jurisdiction. By 1955, there were over 500 LATAs in the United States provided by mapsforyoufree.

Also explore 780 Area code


The 815 area code is a telephone area code in the United States. It was created on September 15, 1997 as an overlay of the707 area code to cover the western portion of Los Angeles County. The 815 area code originally covered all of San Bernardino County, but was split into two areas: the 818 area code for the southern half of San Bernardino County and the 858 area code for the north-central portion of San Bernardino County. 

 What time zone is area code 815?

The 815 area codes are located in the central time zone. Chicago is one of the most populous cities in the United States, located in the state of Illinois. 

Is (815) Area Code a Toll-Free Number?

No. The (815) area code is not a toll-free number. If you need to call a toll-free number please call 1-800-555-1212 or dial your local access number.

Area code 815 Location Map

Area code 815 Location Map

Top 20 Counties in Area Code 815

Kendall, IL114,7361%42%
Stephenson, IL47,7115%100%
Livingston, IL38,9509%100%
Lee, IL36,0316%100%
Iroquois, IL29,7189%91%
Bureau, IL34,9785%73%
Jo Daviess, IL22,6785%100%
Carroll, IL15,3874%100%
Putnam, IL6,0061%93%
Ford, IL14,0811%31%

 Top Cities in Area Code 815

Kankakee, IL27,5370%100%
McHenry, IL26,9920%100%
Freeport, IL25,6380%100%
Belvidere, IL25,5850%100%
Woodstock, IL24,7700%100%
New Lenox, IL24,3940%100%

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