Library systems are established by the Illinois Library System Act, which encourages public education by promoting the sharing of library resources throughout the state through services like delivery, automation, and talking book services. 

As of July 01, 2011, the state of Illinois is served by two multitype library systems, Illinois Heartland and Reaching Across Illinois, and one public library system.

Illinois Heartland Library System (IHLS)

IHLS covers an approximate 28,000 square mile service area and reaches out to more than 590 member libraries that represent academic, public, school, and special libraries. 

Reaching Across Illinois Library System (RAILS)

RAILS service area covers approximately 27,000 square miles and provides services to more than 1500 academic, public, school, and special libraries.

Chicago Public Library System

The state's only public library system, Chicago Public Library has more than 70 locations and provides services to nearly 2.7 million residents.