| Code | Name | Region |
|---|---|---|
| USMAL | Malibu | CA |
| USMLN | Malin | OR |
| USM3A | Malinta | OH |
| USM4A | Malmo | NE |
| USMM6 | Malmstrom Afb | MT |
| USNYM | Malone | NY |
| USAOE | Malone | TX |
| USXIT | Malott | WA |
| USTQM | Malta | IL |
| USMLK | Malta | MT |
| USMLX | Malta | NY |
| USZGB | Malta | OH |
| USAQJ | Maltby | WA |
| USMQ4 | Maher Terminal | NJ |
| USMA5 | Mahnomen | MN |
| USJMM | Mahomet | IL |
| USMAJ | Mahopac | NY |
| USMAT | Mahrt | AL |
| USMM8 | Mahtomedi | MN |
| USMHW | Mahwah | NJ |
| USMAI | Maida | ND |
| USUQO | Maiden | NC |
| USMS3 | Maidens | VA |
| USIBL | Maidsville | WV |
| USIEI | Maineville | OH |
| USML6 | Mainland | PA |
| USML3 | Maitland | FL |
| USZ38 | Maize | KS |
| USMK7 | Makanda | IL |
| USMK8 | Makawao | HI |
| USUMJ | Malabar | FL |
| USMLD | Malad City | ID |
| USMGA | Malaga | NJ |
| USUID | Madrid | IA |
| USMA6 | Magalia | CA |
| USMZ5 | Magazine | AR |
| USQME | Magee | MS |
| USM7V | Maggie Valley | NC |
| USMG7 | Magma | AZ |
| USXIU | Magna | UT |
| USZG3 | Magness | AR |
| USAGO | Magnolia | AR |
| USM3G | Magnolia | KY |
| USMAG | Magnolia | MA |
| USM4Z | Magnolia | MN |
| USMN8 | Magnolia | MS |
| USM6L | Magnolia | NC |
| USOIA | Magnolia | OH |
| USAGI | Magnolia | TX |
| USMLP | Magnolia Park | CA |