You can find out if you are in Dan's district by entering your address into the eVoter website to see your sample ballot: http://illinois.evoter.com/

You can also find out if you are in the Cook County Board Of Review 1st District by looking for your address in the Cook County Clerk's Directory of Elected Officials:
http://www.cookcountyclerk.com/elections/deo/Pages/default.aspx