Illinois:
State Parks (http://dnr.state.il.us/lands/landmgt/PARKS/)
Reservation Information (http://dnr.state.il.us/lands/landmgt/programs/camping/camprsvp.htm)
Indiana:
State Parks (http://www.in.gov/dnr/parklake/properties/stateparks.html)
Reservations (http://www.indiana.reserveworld.com/)
Michigan:
DNR (http://www.michigan.gov/dnr)
Reservations (http://www.midnrreservations.com/)
1-800-44-PARKS
Minnesota:
State Parks (http://www.dnr.state.mn.us/state_parks/index.html)
Reservations (https://www.stayatmnparks.com/)
1-866-85PARKS
Ohio:
State Parks (http://www.dnr.state.oh.us/parks/default.htm)
Reservations (http://www.dnr.state.oh.us/parks/lodging/)
Wisconsin
State Parks (http://www.dnr.state.wi.us/org/land/parks/)
Resevations (http://www.dnr.state.wi.us/org/land/parks/reservation/index.html) (has links to ReserveAmerica (http://www.reserveamerica.com/client/client_wi.jsp) for Wisconsin)
(888) WI-PARKS ((888) 947-2757). The toll-free TTY number for reservations is (800)274-7275.
Austin
In Ohio the new link to ODNR is http://www.dnr.state.oh.us/parks/tabid/80/Default.aspx (//%22http://www.dnr.state.oh.us/parks/tabid/80/Default.aspx%22)
In SW Ohio, Hamilton County has two parks with camping, Winton Woods or Miami Whitewater. Find their site here: http://www.hamiltoncountyparks.org/ (//%22http://www.hamiltoncountyparks.org/%22)