| Code | Name | Region |
|---|---|---|
| USMG2 | Mcgregor | IA |
| USMG3 | Mcgregor | MN |
| USMG4 | Mcgregor | TX |
| USMHB | Mchenry | IL |
| USM2H | Mchenry | MD |
| USMZI | Mcintosh | AL |
| USM25 | Mcintosh | GA |
| US5TH | Mcintosh | SD |
| USMCQ | Mcintyre | GA |
| USKMD | Mckean | PA |
| USMKJ | Mckees Rocks | PA |
| USMKR | Mckeesport | PA |
| USMKN | Mckenney | VA |
| USZXY | Mcconnells | SC |
| USMNB | Mcconnellsburg | PA |
| USZXW | Mcconnellsville | NY |
| USMVZ | Mcconnelsville | OH |
| USMCO | Mccook | IL |
| USMCK | Mccook | NE |
| USOIK | Mccormick | SC |
| USQQM | Mccoy | CO |
| USMCC | Mccrory | AR |
| USMD3 | Mcdade | TX |
| USMDT | Mcdermott | OH |
| USMDP | Mcdonald | PA |
| USDGD | Mcdonald | TN |
| USDOD | Mcdonald, Muskingum | OH |
| USMD8 | Mcdonald, Trumbull | OH |
| USMCH | Mcdonough | GA |
| US9DH | Mcdonough | NY |
| USDJW | Mcdowell | WV |
| USLHC | Mcelhattan | PA |
| USZWM | Mcewen | TN |
| USMYL | Mccall | ID |
| USMKX | Mccalla | AL |
| USMPN | Mccamey | TX |
| USCA5 | Mccanna | ND |
| USNVM | Mccarran | NV |
| USMXY | Mccarthy | AK |
| USMFS | Mcchord Air Force Base | WA |
| USVCZ | Mcclave | CO |
| USQMW | Mccleary | WA |
| USNKF | Mcclellan | CA |
| USMC2 | Mcclellan Air Force Base | CA |
| USMP6 | Mcclellan Place | CA |
| USM3C | Mcclellandtown | PA |
| USV9V | Mcclellanville | SC |
| USOJC | Mccloud | CA |
| USJMU | Mcclure | OH |
| USVMC | Mcclure | PA |