Illinois criminal record searches can be completed through the Illinois Department of Corrections website or the Illinois State Police website. Criminal record information for incarcerated inmates can also be obtained by phone at the number listed on the Department of Corrections website, as of 2015.
Request criminal history background checks by sending email to the Illinois State Police Bureau of Identification; responses are delivered within about 24 hours. Instructions for this procedure can be found on the Illinois State Police website, as well as the user agreement and file transfer program. Federal law requires emails sending criminal history records be encrypted, and the website also has instructions for decryption of criminal history information sent by email.
Criminal searches for individuals who are currently or recently incarcerated in Illinois prisons, or on probation, can be carried out on the Illinois Department of Corrections website. Searches may be done by the individual’s last name, Department of Corrections identification number or birth date. Illinois also has a website specifically dedicated to sex offender criminal history searches. Sex offender searches can be done by name, city, ZIP code, incarceration status and offender type. For example, entering "Chicago" in the City field brings up all currently registered convicted sex offenders in Chicago.