| Code | Name | Region |
|---|---|---|
| USOUV | Mount Vernon | MO |
| USYMV | Mount Vernon | NY |
| USMVH | Mount Vernon | NY |
| USM2V | Mount Vernon | OH |
| USMWT | Mount Vernon | OH |
| USMVX | Mount Vernon | TX |
| USMV3 | Mount Vernon | TX |
| USMVW | Mount Vernon | WA |
| USUMX | Mount Washington | KY |
| USMWS | Mount Wilson | CA |
| USMWF | Mount Wolf | PA |
| USUTZ | Mount Zion | IL |
| USMU4 | Mountain | WI |
| USM77 | Mountain Brook | AL |
| USCZJ | Mountain Center | CA |
| USTKM | Mountain City | GA |
| USMFM | Mountain City | TN |
| USMUP | Mount Prospect | IL |
| USMPK | Mount Pulaski | IL |
| US9MY | Mount Royal | NJ |
| US5MS | Mount Saint Francis | IN |
| USM5T | Mount Savage | MD |
| USMHS | Mount Shasta | CA |
| USJUI | Mount Sinai | NY |
| USGTM | Mount Sterling | IL |
| USMGK | Mount Sterling | KY |
| USYMS | Mount Sterling | OH |
| USM75 | Mount Storm | WV |
| USSU3 | Mount Summit | IN |
| USOUU | Mount Ulla | NC |
| USMUU | Mount Union | PA |
| USONU | Mount Union, Huntingdon | PA |
| USUUE | Mount Upton | NY |
| USUVO | Mount Vernon | AL |
| USMXF | Mount Vernon | IA |
| USMVN | Mount Vernon | IL |
| USOVO | Mount Vernon | IN |
| USOUO | Mount Morris | NY |
| USUNS | Mount Morris | PA |
| USQNB | Mount Nebo | WV |
| USFVS | Mount Olive | MS |
| USMNO | Mount Olive | NC |
| USMQV | Mount Olive | NJ |
| USMXQ | Mount Orab | OH |
| USPY4 | Mount Perry | OH |
| USMPY | Mount Pleasant | FL |
| USMPZ | Mount Pleasant | IA |
| USMOP | Mount Pleasant | MI |
| USMTT | Mount Pleasant | PA |
| USMPH | Mount Pleasant | SC |