- Gottlieb Memorial Hospital
- Grainger
- Grant Thornton
- Great Lakes Analytical
- Great Lakes Construction Association
- Greater Peoria Contractors and Suppliers Association, Inc
- Greencastle of Englewood
- Greencastle of Woodlawn I
- Hampton Inn Chicago-Naperville
- Hassett Air Express
- Health Forum
- Health Resources and Services Administration, Region V
- Healthcare Information and Management Systems Society
- Heart of Illinois United Way
- Heartland Community College
- Highland Park Ford
- Hilton Garden Inn Chicago North Shore-Evanston
- Hilton Garden Inn Hoffman Estates
- Hinton and Grusich
- Hoffman Estates Chamber of Commerce and Industry
- Holiday Inn and Suites Chicago North Shore Skokie)
- Holiday Inn and Suites Chicago O'Hare Rosemont Hotel
- Holiday Inn and Suites Chicago-Downtown
- Holiday Inn Chicago Matteson Conf Ctr
- Holiday Inn Express Rolling Mdws-Schaumburg Area
- Holy Cross Hospital
- Homewood Suites by Hilton Chicago-Downtown
- Hotel Essex Chicago
- HSHS Good Shepherd Hospital
- HSHS St. Anthony's Memorial Hospital
- HSHS St. Francis Hospital
- HSHS St. John's Hospital
- HSHS St. Mary's Hospital
- Humboldt Park Hospital
- Hyatt Corporation
- Illini Community Hospital
- Illinois Association of Community Action Agencies
- Illinois Association of School Boards
- Illinois Association of School Business Officials
- Illinois College
- Illinois Council of Health System Pharmacists
- Illinois Department of Public Health
- Illinois Health and Hospital Association
- Illinois Health Education Consortium-AHEC
- Illinois Institute of Technology Student Health and Wellness Center
- Illinois Manufacturers Association
- Illinois Secretary of State Organ-Tissue Donor Program
- Illinois Society of Association Executives
- Illinois State University
- Illinois Wesleyan University