- International Postal Systems
- International Sign Association
- International Society on Hypertension in Blacks
- International Steel Group, Inc.
- International Technology Education Association
- International Trade Council
- International Travel Services, Inc.
- International Truck and Engine Corp
- International Truck and Engine-Navistar
- International Union of Police Associations
- Internet Destination Sales System
- Interstate Hotels and Resorts
- Intex Corporation
- Intra Luminal
- INTREGRIS Baptist Medical Center
- Intuitive Business Concepts
- Invacare Continuing Care Group
- Invaluable Solutions, LLC
- Inverness Hotel and Golf Club, Denver
- Investment Management Consultants Association
- Invivo Data
- Inyo County
- Iowa Bankers Association
- Iowa City VA Health Care System
- Iowa City-Coralville Convention and Visitors Bureau
- Iowa Clinical Research Corporation
- Iowa Corn Processors
- Iowa Dental Association
- Iowa Department of Public Health, Division of Family and Community Health
- Iowa Donor Network
- Iowa Events Center
- Iowa Farm Bureau Federation
- Iowa Governor's Office
- Iowa Health Des Moines
- Iowa Health Physicians-Internal Medicine
- Iowa Health system
- Iowa Hospital Association
- Iowa Limestone Producers Association
- Iowa Methodist Kidney Transplant Center
- Iowa Methodist Medical Center
- Iowa Specialty Hospital - Belmond
- Iowa Specialty Hospital - Clarion
- Iowa State Association of Counties
- Iowa State Bank
- Iowa-Nebraska Primary Care Association
- Ipromotions
- IQ Solutions
- Irene Wortham Center
- Iron Age Corp.
- Iron County Medical Care Facility