| Code | Name | Region |
|---|---|---|
| US3MN | Minden | TX |
| USMCY | Minden City | MI |
| USDHO | Mindoro | WI |
| USMHZ | Mine Hill | NJ |
| USMNA | Mineola | NY |
| USMIX | Mineola | TX |
| USNRZ | Miner | MO |
| USC87 | Mineral | CA |
| USEYA | Mineral | TX |
| USIEA | Mineral | VA |
| USM5B | Mineral Bluff | GA |
| USMC4 | Mineral City | OH |
| USM3M | Mineral Point | MO |
| USMP3 | Mineral Point, Iowa | WI |
| USNSE | Milton | FL |
| USM3N | Milton | GA |
| USMXW | Milton | IA |
| USM8O | Milton | KY |
| USMXL | Milton | MA |
| USIJL | Milton | NH |
| USMZG | Milton | NY |
| USMIC | Milton | PA |
| USMT5 | Milton | VT |
| US8RE | Milton | WA |
| USM8I | Milton | WI |
| USZNM | Milton | WV |
| USM2M | Milton Mills | NH |
| USM8M | Miltona | MN |
| USMZH | Milton-freewater | OR |
| USVL9 | Milville | NJ |
| USMKE | Milwaukee | WI |
| USMWX | Milwaukie | OR |
| USIMB | Mimbres | NM |
| USMS6 | Mims | FL |
| USMMJ | Milltown | NJ |
| USMM5 | Milltown | WI |
| US3LV | Millvale | PA |
| USV6M | Millville | IN |
| USV8V | Millville | MA |
| USMIV | Millville | NJ |
| USVLZ | Millville | NJ |
| USMV2 | Millville | PA |
| USMVI | Millville | RI |
| USIOO | Millwood | KY |
| USMW7 | Millwood | NY |
| USZEZ | Millwood | VA |
| USMW4 | Millwood | WV |
| USMN4 | Milner | GA |
| USMXD | Milner | ID |
| USJMO | Milo | ME |