"Chicago Air Route Traffic Control Center

Chicago ARTCC
619 West Indian Trail Road
Aurora, Illinois 60506

630-906-8200"
http://www.faa.gov/about/office_org/headquarters_offices/ato/artcc/chicago/information/contact/

Look to the map below:
"From the North:
Proceed south on I-355 North-South Tollway. Exit west onto I-88 Ronald Reagan Memorial Tollway toward Aurora. Travel approximately 15.2 miles to the Route 31 exit. Exit south at Route 31. Turn right on to Route 31 and proceed approximately 1 mile to Indian Trail Road. Turn right onto Indian Trail Road. Travel approximately .8 miles to the center located on the right.
From the East:
Proceed west on I-88 Ronald Reagan Memorial Tollway. Exit south at Route 31. Turn right onto Route 31 and proceed approximately 1 mile to Indian Trail Road. Turn right onto Indian Trail Road. Travel approximately .8 miles to the center located on the right.
From the South:
Proceed north on I-355 North-South Tollway. Exit west onto I-88 Ronald Reagan Memorial Tollway toward Aurora. Travel approximately 15.2 miles to the Route 31 exit. Exit south at Route 31. Turn right on to Route 31 and proceed approximately 1 mile to Indian Trail Road. Turn right onto Indian Trail Road. Travel approximately .8 miles to the center located on the right.
From the West:
Proceed east on I-88 Ronald Reagan Memorial Tollway. Exit at Orchard Road. Turn left onto Orchard Road. Travel approximately 1 mile to Indian Trail Road. Turn left onto Indian Trail Road. Travel approximately 2.6 miles to the center located on the left.
From O'Hare:
Exit the airport on I-190 E to Chicago. Take exit 1D to I-294 South to Indiana. Proceed south approximately 9 miles on I-294 and exit west on the I-88 East/West Tollway to Aurora. Follow the From the East directions above.
From Midway:
Exit the airport north on Cicero Avenue or Central Avenue. Proceed approximately 1.8 miles to I-55 South. Turn left and merge onto I-55 South. Proceed southwest on I-55 for approximately 16 miles to I-355 North. Proceed north on I-355 for approximately 7 miles and exit west on the I-88 East/West Tollway to Aurora. Follow the From the East directions above."
http://www.faa.gov/about/office_org/headquarters_offices/ato/artcc/chicago/information/directions/