| Abbreviation | Definition |
|---|---|
| USMB-FO | United States - Mexico Border - Field Office |
| USMH | United States Marine Hospital |
| USMHRP | United States Military HIV Research Program |
| USMINT | United States Mint |
| USMM | United States Merchant Marine |
| USMP | United States Military Personnel |
| USMS | United States Marshals Service |
| USMV | United States Military Veteran |
| USMZ | United States Military Zone |
| USNB | United States National Body |
| USNC | United States National Committee of the International Electrotechnical Commission |
| USNC/CIE | United States National Committee of the International Commission on Illumination |
| USNCB | United States National Central Bureau of INTERPOL |
| USNG | United States National Grid |
| USNH | United States Naval Home |
| USNP | United States Nationalist Party |
| USNP | United States Newspaper Preservation |
| USNPMG | United States Newspaper Preservation Microfilming Guidelines |
| USO | Unconfirmed Stories Organization |
| USOA | United States Of America |