Could I get a bus to the Chicago area from Door County ???
Appleton is not in Door County. Post this in the Door County forum.
I think you have to take Amtrak or a bus to Milwaukee, transfer to another bus to Green Bay, and then take a private shuttle. Contact bablerbus.com; they are a charter service serving Southern Door County. You might be able to get a ride, at least one-way, on one of their excursions to Chicago. Your other choice would be to take a park district or other bus tour.