| Abbreviation | Definition |
|---|---|
| URX | Unirex Corporation |
| US | Ultimate Spas |
| USA | Universal Standard Assurance |
| USAA | United Services Automobile Association |
| USAI | University Swimming Association Inc |
| USAI | Urban Science Applications Inc |
| USAMCD | USA McDonald Corporation |
| USARTINDIA | USART Technologies India, PVT LTD. |
| USAT | U S A Trucking Company |
| USC | Underground Serbian Cafe |
| USCC | United States Cellular Corporation |
| USCGM | United States Capital Graphic Modification |
| USCGS | United States Coin Grading Service |
| USCGT | United States Capital Gift Trust |
| USCI | Unified Supply Chain Inc |
| USCI | United Silicon Carbide Inc |
| USCM | US Credit Management Company |
| USCO | Universal Service COmpany |
| USCS | Universal Study Counselling Services |
| USCU | United States Crude International, Inc. |