| Code | Name | Region |
|---|---|---|
| USMXN | Milan | TN |
| USMBK | Milbank | SD |
| USMLQ | Milbridge | ME |
| USM2B | Milburn | OK |
| USMDL | Midland Park | NJ |
| USMLH | Midlothian | IL |
| USMIB | Midlothian | TX |
| USMED | Midlothian | VA |
| USM9P | Midpines | CA |
| USIDV | Midvale | OH |
| USMZC | Midvale | UT |
| USM5E | Midville | GA |
| USIWY | Midway | AR |
| USM8W | Midway | CA |
| USMYF | Midway | FL |
| USIWA | Midway | GA |
| USDBD | Midway | IL |
| USM23 | Midway | KY |
| USMWY | Midway | TN |
| USM7Y | Midway | UT |
| USMWC | Midway City | CA |
| USM2P | Midway Park | NC |
| USQMY | Midway, Liberty | GA |
| USMWV | Middletown | VA |
| US7MS | Middletown Springs | VT |
| USDDN | Middletown, Allen | IN |
| USUQK | Middletown, Frederick | MD |
| USDD3 | Middletown, Shelby | IN |
| USMVK | Middleville | MI |
| USDDY | Middleway | WV |
| USIFE | Midfield | AL |
| USXFW | Midfield | TX |
| USMK9 | Midkiff | TX |
| USMJD | Midland | GA |
| USILD | Midland | MI |
| USIAL | Midland | NC |
| USM4D | Midland | OH |
| USZID | Midland | PA |
| USXAD | Midland | SD |
| USMAF | Midland | TX |
| USYML | Midland | VA |
| USMDD | Midland Airpark | TX |
| USIDY | Midland City | AL |
| USID9 | Middleton | ID |
| USMT3 | Middleton | IL |
| USMYN | Middleton | MA |
| USDDT | Middleton | MI |
| USYYV | Middleton | PA |
| USMJP | Middleton | TN |
| USMDW | Middleton | WI |