- Information Technology E-Commerce, Commercial Contracting Center ITECH)
- InfoUSA
- ING Financial Advisers
- Ingersoll-Rand
- Ingles Markets Incorporated
- Ingleside Presbyterian Retirement Community
- Ingraham Manor
- Ingram Entertainment
- Ingram Micro, Inc
- Injection Technology Corporation-ITECH
- Inland Empire United Way
- Inland Empire United Way, Desert Communities Region
- Inland Hospital
- Inland Valley Medical Center
- Inmate Calling IC Solutions
- Inn at Rancho Santa Fe
- Innovative Consumers Insurance Services, LLC
- Innovative Designs
- Innovative Health Strategies
- Innovative Print and Media Group, Inc.
- Inova Alexandria Hospital
- Inova Fair Oaks Hospital
- Inova Fairfax Hospital
- Inova Loudoun Hospital
- Inova Mount Vernon Hospital
- InSight 3
- Insight Chicago
- Insightful
- Inspira Health Network
- Inspire Specialty Hospital
- Inspired Life Cremation
- Inspired Life Memorials & Cremation
- Institute For HealthCare Improvement IHI)
- Institute for the Puerto Rican Hispanic Elderly, Inc.
- Institute of Environmental Sciences and Technology
- Instituto de Guencios Forenses
- Instrumentation Group
- Insurance Women of Buffalo, Inc.
- Integrated Alliance L.P.
- Integrated Circuit Systems Inc.
- Integrated Electrical Services, Inc.
- Integrated Software Solutions, Inc.
- Integrex
- INTEGRIS Bass Baptist Medical Center
- INTEGRIS Canadian Valley Hospital
- INTEGRIS Grove Hospital
- INTEGRIS Health
- INTEGRIS Health Baptist Medical Center Portland Avenue
- INTEGRIS Health Edmond Hospital
- INTEGRIS Health Miami Hospital