Hi all,
If you want to track down the state Senator and state House representative that represent you, go to this website: http://www.elections.il.gov/districtlocator/addressfinder.aspx
Enter your address, let the system find that address, confirm it, and then you’ll get a list with contact information. If you write to one of these individuals using your Illinois address, your address will be used to confirm that you are a resident of that person’s district, and your letter will be received and counted.
Google “find my representatives” to get similar websites to find who represents your district (either using your Illinois address or another home address in the U.S.) at the federal level.