If it is not listed here We do not have it. . All information, data and images contained on this site are the property of Click Here to EMail the Webmaster Or, navigate to your city or town to view your local city and/or police frequencies within Lake County, Illinois. If you want to familiarize yourself with codes that police officers use to talk with one another on the radio, make sure to review 10 codes below.. Below are any Lake County trunking scanner frequencies and their corresponding talkgroups (decimals). Corrections,