| 1 | USP | U.S. DEPARTMENT OF DEFENSE - PORTSMOUTH NH NAVAL YARD | | | PWRC |
| 2 | USPC | (UPCX) USPCI, INC. | | | PWRC |
| 3 | USPC | US PATTERN CO INC | | | SCAC4 |
| 4 | USPF | UNITED STATES PINE FOUNDRY | | | PWRC |
| 5 | USPF | United States Pipe & Foundry Corporation | | USA | TRAFFIC |
| 6 | USPM | USA PETROLEUM CORPORATION | | | SCAC4 |
| 7 | USPS | United States Postal Service | | | SCAC2 |
| 8 | USPS | UNITED STATES POSTAL SERVICE | | | SCAC4 |
| 9 | USPU | EXSIF WORLDWIDE | | USA | BIC |
| 10 | USPU | EXSIF Worldwide | | | RSRV |
| 11 | USPU | EXSIF WORLDWIDE | | | SCAC4 |
| 12 | USPX | U.S. Phosphoric Products Corp. | 7/1935-4/1938 | | NAKINA |
| 13 | USPX | U.S. Phosphoric Products-Division Tennessee Corp. | 1/1941-1/1946 | | NAKINA |
| 14 | USPX | U.S. Pipe and Foundry Co. | added 1/1960; 4/1961-10/1966; eliminated 4/1970 | | NAKINA |
| 15 | USPX | U.S. Plastics Corp. | 1/1994-7/2005 (not listed) | | NAKINA |
| 16 | USPX | U.S. Phosphoric Products Corp. | Apr-38 | | NRHS |
| 17 | USPX | U.S. Pipe and Foundry Co. | added 1/60; 4/61-10/66; eliminated 4/70 | | NRHS |
| 18 | USPX | U.S. Plastics Corp. | 1/94-7/2000 | | NRHS |
| 19 | USPX | *U. S. PHOSPHORIC PRODUCTS, DIV. TENNESSEE CORP. | | | PWRC |
| 20 | USPX | *U. S. PIPE & FOUNDRY CO. | | | PWRC |
| 21 | USPX | *U. S. PLASTICS CORPORATION | | | PWRC |
| 22 | USPX | US Plastics Corporation | | | RSRV |
| 23 | USPX | US PLASTICS CORPORATION | | | SCAC4 |
| 24 | USPZ | U.S. POSTAL SERVICE | | | PWRC |
| 25 | USPZ | US Postal Service | | | RSRV |
| 26 | USPZ | U S POSTAL SERVICE | | | SCAC4 |
