How to find a state or county's website.
As a general rule if you need to find a state's web site, they are setup all in the same way. www.state.il.us. All you need to do to find a particular state's site is to change the state code. I.E. Wisconsin's would be: www.state.wi.us. They use the post office designation for each state.
The counties follow the same sort of rules as above. Just add "co." to the front and add the appropriate county next to it. So for Cook County, IL http://www.co.cook.il.us/