How do I transport a firearm through an Illinois community with an ordinance that prohibits firearms or handguns?
Illinois' Unlawful Use of Weapons law does not preempt local ordinances from banning firearms. Persons carrying or transporting firearms through such communities could be subject to local firearm ordinances. It is recommended that you contact local authorities regarding their firearm ordinances.
This is from the State Police FAQ. So to be 100% safe one would have to know the ordinances for each of the jurisdictions one passes through. I can see how this could really cause problems. I going to St. Louis this weekend and my friend wanted to do some shooting at the local range. I guess I'll be renting a handgun at the range.