| Code | Name | Region |
|---|---|---|
| USMPT | Milpitas | CA |
| USYMY | Milroy | IN |
| USMZE | Milroy | PA |
| USMLW | Milton | DE |
| UST9X | Millican | TX |
| US5MK | Milliken | CO |
| USMTL | Millington | MD |
| USM9I | Millington | MI |
| USMGY | Millington | NJ |
| USMZD | Millington | TN |
| USMLT | Millinocket | ME |
| USMS2 | Millis | MA |
| USIMY | Millmont | PA |
| USIPR | Millport | AL |
| USM3Y | Millry | AL |
| USJML | Mills | WY |
| USMS9 | Mills River | NC |
| USMZ8 | Millsap | TX |
| USMBD | Millsboro | DE |
| USKYA | Millsdale | IL |
| USMS7 | Millstadt | IL |
| USISZ | Millston | WI |
| USIWH | Millstone | NJ |
| USMP9 | Millstone Township | NJ |
| USXID | Millbury | OH |
| US5MD | Milldale | CT |
| USMLJ | Milledgeville | GA |
| USQLB | Milledgeville | IL |
| USMI4 | Millen | GA |
| USM9R | Miller | MO |
| USIL2 | Miller | SD |
| USIPL | Miller Place | NY |
| USZQS | Millersburg | IN |
| USILB | Millersburg | KY |
| USMLV | Millersburg | OH |
| USMUG | Millersburg | PA |
| USILR | Millersport | OH |
| USQJT | Millerstown | PA |
| US9MV | Millersview | TX |
| USMVB | Millersville | MD |
| USIIF | Millersville | OH |
| USISE | Millersville | PA |
| USMT4 | Millerton | NY |
| USOZB | Millheim | PA |
| USXIK | Milford | TX |
| USMLF | Milford | UT |
| USQAO | Milford | VA |
| USFKC | Milford Center | OH |
| USM4M | Milford Mill | MD |
| USMM7 | Mililani Town | HI |