The website of the Illinois General Assembly provides links to legislation & laws, legislative reports, Illinois Register, Illinois Compiled Statutes, Illinois Constitution, senate and house information, and additional resources. Current as well as historical legislation is covered via full text of the Illinois Compiled Statutes and bills and Public Acts from the 90th and subsequent General Assemblies. Transcripts are available for older legislative years.
Below are some additional resources that may help you in your legislative research.