| Code | Name | Region |
|---|---|---|
| USMGJ | Montgomery | NY |
| USNGY | Montgomery | OH |
| USQMG | Montgomery | PA |
| USYGY | Montgomery | TN |
| USMG6 | Montgomery | TX |
| US7MG | Montgomery | VT |
| USOTE | Montgomery | WV |
| USGZY | Montgomery Center | VT |
| USM4G | Montgomery City | MO |
| USNMV | Montgomery Village | MD |
| USUXG | Montgomeryville | PA |
| USMOQ | Monticello | AR |
| USVMQ | Monticello | FL |
| USMQC | Monticello | GA |
| USMXO | Monticello | IA |
| USMQD | Monticello | IL |
| USMTB | Montebello | CA |
| USMB6 | Montebello | NY |
| USZMO | Montecito | CA |
| USM4O | Montello | PA |
| USOLO | Montello | WI |
| USMY3 | Monterey | CA |
| US3MR | Monterey | MA |
| USMZY | Monterey | TN |
| USYTX | Monterey | VA |
| USMZU | Monterey Park | CA |
| USMZW | Montesano | WA |
| USMVO | Montevallo | AL |
| USMVE | Montevideo | MN |
| USMOZ | Montezuma | GA |
| USYMZ | Montezuma | IA |
| USMZM | Montezuma | IN |
| USTZM | Montezuma | KS |
| USXQZ | Montfort | WI |
| USMGM | Montgomery | AL |
| USZMR | Monrovia | MD |
| USMSE | Monsey | NY |
| USMZS | Monson | MA |
| US6MS | Monson | ME |
| USM5A | Mont Alto | PA |
| USMTG | Mont Belvieu | TX |
| USTV7 | Mont Vernon | NH |
| USSIY | Montague | CA |
| USM2G | Montague | MA |
| USTGQ | Montague | MI |
| US7UE | Montague | NJ |
| USJTA | Montana City | MT |
| USOQT | Montara | CA |
| USMTP | Montauk | NY |
| USMZT | Montclair | CA |