| Code | Name | Region |
|---|---|---|
| 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 |
| USMPL | Mount Pleasant | TN |
| USMPS | Mount Pleasant | TX |
| USMSD | Mount Pleasant | UT |
| USUPN | Mount Pleasant | WI |
| USUPI | Mount Pleasant Mills | PA |
| USUPA | Mount Pleasant, Cabarrus | NC |
| USMPO | Mount Pocono | PA |
| USUQS | Mount Holly | SC |
| US7MH | Mount Holly | VT |
| USQHS | Mount Holly Springs | PA |
| USUHE | Mount Hope | AL |
| USM7H | Mount Hope | KS |
| USMH9 | Mount Hope | OH |
| USULZ | Mount Hope | WV |
| USMH4 | Mount Horeb | WI |
| USUIA | Mount Ida | AR |
| USUQV | Mount Jackson | VA |
| USOJW | Mount Jewett | PA |
| USMJ2 | Mount Joy | PA |
| USMJY | Mount Joy | PA |