| Abbreviation | Definition |
|---|---|
| USI | Ultra Services Inc |
| USI | Ultrasonic Systems Inc |
| USI | Underground Systems Inc |
| USI | United Services Inc |
| USI | Unitray Systems Inc |
| USI | Unitray Systems, Inc. |
| USI | Universal Systems, Inc. |
| USIC | United States Infrastructure Corp |
| USIC | United States Infrastructure Corporation |
| USIC | United Surety Indemnity Company |
| USIM | U.S. Intermodal Maritime, Inc. |
| USIO | United States Insurance Operations |
| USJ | UEP Subang Jaya ( Summit Hotel Subang) |
| USJ | Universal Studios Japan |
| USL | Ultra Stereo Labs, Inc. |
| USL | Unix Software Laboratory |
| USLD | United States Laser Network |
| USLD | United States Long Distance |
| USLI | United States Liability Insurance Group |
| USLI | Urological Surgeons of Long Island |