- Imperial Graphics, Inc.
- IMS Companies
- IMS Interactive Media Solutions, LLC
- In Living Stereo, LTD
- Incarnate Word Retirement Community
- Incontinental Hotel Group
- INDEC Systems, Inc.
- Independence Blue Cross
- Independence Community Bank
- Independent Electrical Contractors of New England
- Independent Health
- Independent Healthcare Staffing, Inc.
- Independents, Collins Plaza, Cedar Rapids
- India Community Center of Austin
- Indian Health Service HIS)
- Indian Health Service Yankton Service Unit
- Indian Health Services
- Indian Hills Community College, Health Occupations
- Indian Path Community Hospital
- Indian River Medical Center
- Indian Valley Hospital
- Indiana Association of County Councils
- Indiana Association of Plumbing and Heating Cooling Contractors
- Indiana Constructors, Inc.
- Indiana Council of Community Mental Health Centers Inc
- Indiana Donor Network
- Indiana Hospital Association
- Indiana Primary Health Care Association
- Indiana Protection and Advocacy Service
- Indiana Regional Medical Center
- Indiana University Medical Center
- Indiana University of Pennsylvania
- Indianapolis Chamber of Commerce
- Indianapolis Convention and Visitors Association
- Indianapolis-Castleton - Fairfield Inn by Marriott
- Indianapolis-College Park - Fairfield Inn by Marriott
- Indo-American Community Federation
- Indu and Raj Soin Medical Center
- Industrial Bank N.A.
- Industrial Telecommunications Associations, Inc.
- Industrial TurnAround Corporation
- Indy Parks and Recreation AARP)
- Infineon Technologies
- Infinite Legacy
- Informatics Corporation
- Information and Computing Services
- Information Inc.
- Information Resources Management College
- Information Sciences Corporation, Office of Early Childhood Development
- Information Systems Services