Great Lakes Zone Operations Centers

Illinois Operations Center
2702 Ireland Grove Rd.
Bloomington, IL 61709-0001
(309) 622-6000

Indiana Operations Center
2550 Northwestern Ave.
West Lafayette, IN 47906-1394
(765) 463-8123

Kalamazoo Administration Building
5528 Portage Road
Portage, MI 49002
(269) 553-2600