| Code | Name | Region |
|---|---|---|
| USMR9 | Morgan | PA |
| USGGM | Morgan | UT |
| US7MR | Morgan | VT |
| USMGN | Morgan City | AL |
| USLMO | Morgan City | LA |
| USPTN | Morgan City-patterson Apt | LA |
| USMJV | Morgan Hill | CA |
| US2MP | Morgan Point | TX |
| USQGF | Morganfield | KY |
| USMPP | Morgans Point | TX |
| USO99 | Morganton | GA |
| USMRN | Morganton | NC |
| USMGG | Morgantown | KY |
| USMJZ | Morgantown | NC |
| USMGP | Morgantown | PA |
| USMWG | Morgantown | TN |
| USMGW | Morgantown | WV |
| USMQK | Moorpark | CA |
| USMSZ | Moose Pass | AK |
| USUXB | Moosic | PA |
| USOOU | Moosup | CT |
| USMJM | Mora | MN |
| USMMA | Mora | NM |
| USQMO | Moraga | CA |
| USMRE | Moraine | OH |
| USMX7 | Moran | WY |
| USMJS | Morattico | VA |
| USQOR | Moravia | IA |
| USVIJ | Moravia | NY |
| USMF4 | Moravian Falls | NC |
| USMHR | Morehead | KY |
| USMRH | Morehead City | NC |
| USYRE | Morehouse | MO |
| US9OH | Moreland Hills | OH |
| USONJ | Morenci | AZ |
| USMQR | Morenci | MI |
| USMV4 | Moreno Valley | CA |
| USM7P | Moon Township | PA |
| USMOO | Moonachie/new Jersey | NJ |
| USQMP | Moonstown | PA |
| USOOF | Moore | OK |
| USMBW | Moore | SC |
| USQMF | Moore Haven | FL |
| USMF2 | Moorefield | KY |
| USMF3 | Moorefield | WV |
| USOED | Mooreland | OK |
| USMQE | Moores Mill | NY |
| USOBO | Mooresboro | NC |
| USOUB | Mooresburg | TN |
| USMRJ | Moorestown | NJ |