| United Electronic Industries | Massachusetts |
| United Electronics Corporation, Inc. | Illinois |
| United ERP, LLC | New Jersey |
| United HR, Inc. | Arizona |
| United International College | Florida |
| United Launch Alliance, LLC | Colorado |
| United of Web Studio | |
| United Online, Inc. | California |
| United PC | Florida |
| United Pharma, LLC | |
| United Service Applications, Inc. | California |
| United Software Developers, Inc. | New York |
| United Solutions Group | Massachusetts |
| United Sourcing, Inc. | California |
| United States Biological | Massachusetts |
| United States Controls, Inc. | Ohio |
| United States Information Technology Office | |
| United States Military Academy at West Point Electrical Engineering and Computer Science | New York |
| United States Naval Academy Computer Science Department | Maryland |
| United States Tower Services Ltd | Maryland |
| United States University | California |
| United Systems and Software, Inc. | Florida |
| United Talent Agency, LLC | |
| United Team of Development | |
| United Technologies | South Dakota |
| United Tel-Supply, Inc. | Texas |
| United Telephone Assn., Inc. | Kansas |
| United Teleports Media Services | Florida |
| United Therapeutics Corporation | |
| United Tribes Technical College | North Dakota |
| United Universal Industries, Inc. | Illinois |
| United Utilities, Inc. - United-KUC, Inc. - Yukon Telephone Company | Alaska |
| United Utilities, Inc. | United-KUC, Inc. | Yukon Telephone Company | Alaska |
| United Webworks | Georgia |
| United Wireless Communications, Inc. | Kansas |
| United World Technologies | Maryland |
| United World Telecom | Florida |
| UnitedCode, Inc. | |
| UnitedLayer, LLC | California |
| UnitedLex | New York |
| UnitedPro, Inc. | California |
| UnitedRx | Illinois |
| Uniti | |
| Uniti Group, Inc. | Alabama |
| Uniti, LLC | Arizona |
| unitQ | California |
| Unitrends | South Carolina |
| Unity Biotechnology | California |
| Unity College | Maine |
| Unity Technologies | California |