| International Society for the Study of Xenobiotics | |
| International Society of Automation | North Carolina |
| International Society of Differentiation | |
| International Society of Forensic Computer Examiners | Tennessee |
| International Software Systems, Inc. | |
| International Solutions Group, Inc. | Virginia |
| International Space Services, Inc. | Virginia |
| International Stem Cell Corporation | California |
| International Strategic Consultants | Florida |
| International Symposium on DIStributed Computing | Louisiana |
| International Systems Management | Georgia |
| International Systems Technologies, Inc. | New Jersey |
| International TechneGroup, Inc. | |
| International Technology Solutions | North Carolina |
| International Technology Ventures, Inc. | Washington |
| International Telecommunications Satellite Organization | District of Columbia |
| International Venture Partners, Inc. | California |
| International Virtual Reality Healthcare Association | |
| International Web Association | California |
| International Web Pages, Inc. | Colorado |
| International Wireless Communication Expo | Florida |
| InternationalLinx, LLC | California |
| Internet & Telephone | Massachusetts |
| Internet Access Point Corporation | Texas |
| Internet Advertising Solutions, Inc. | Kentucky |
| Internet Assigned Numbers Authority | California |
| Internet Business Images, LLC | Tennessee |
| Internet Business Systems, Inc. | California |
| Internet Central | Washington |
| Internet chicago | Illinois |
| Internet Commerce Association | District of Columbia |
| Internet Communications, Inc. | Indiana |
| Internet Complete!, Inc. | Oklahoma |
| Internet Computing Solutions | Indiana |
| Internet Concepts Unlimited.com | New York |
| Internet Connections, Inc. | |
| Internet Consulting & Coaching, Inc. | New York |
| Internet Corporation for Assigned Names and Numbers | California |
| Internet Data Management, Inc. | Ohio |
| Internet Data Technology | Pennsylvania |
| Internet Dental Alliance | California |
| Internet Design & Publishing, Inc. | |
| Internet Direct | Texas |
| Internet Dzyns, LLC | Arizona |
| Internet Effects | Utah |
| Internet Engine | Illinois |
| Internet Engineering Task Force | California |
| Internet Exposure | Minnesota |
| Internet Free Planet, Inc. | California |
| Internet Hall of Fame | |