| Code | Name | Region |
|---|---|---|
| US8DL | Dillon | GA |
| USDLN | Dillon | MT |
| USDLL | Dillon | SC |
| USDO3 | Dillsboro | IN |
| USDMG | Dillsburg | PA |
| USUFP | Dillwyn | VA |
| USDWH | Dilworth | MN |
| USDW7 | Dilworth | TX |
| USDB3 | Dime Box | TX |
| US3DT | Dimmitt | TX |
| USDXI | Dexter | NM |
| USDXT | Dexter | NY |
| USXXT | Dexter | OH |
| USDX2 | Dexter City | OH |
| USDHC | D'hanis | TX |
| USIOG | Di Giorgio | CA |
| USDB7 | Diablo | CA |
| USDMD | Diamond | MO |
| USDD7 | Diamond | WA |
| USDBR | Diamond Bar | CA |
| US2DK | Diamond Lake | IL |
| USDXG | Diamond Springs | CA |
| USDD4 | Diamondhead | MS |
| USDM4 | Diamondville | WY |
| USDBE | Diberville | MS |
| USDIB | Diboll | TX |
| USY99 | Dickeyville | WI |
| USDIK | Dickinson | ND |
| USDSX | Dickinson | TX |
| USZKN | Dickson | TN |
| USZC3 | Detroit | TX |
| USDTL | Detroit Lakes | MN |
| USVNS | Devens | MA |
| USQDV | Devenscrest | MA |
| USDVL | Devils Lake | ND |
| USDVD | Devine | TX |
| USDEV | Devon | PA |
| USDE9 | Dewey | AZ |
| USDWO | Dewey | OK |
| USYVC | Deweyville | UT |
| USDWW | Dewitt | IA |
| USDEZ | Dewitt | IL |
| USDEW | Dewitt | NY |
| USVW2 | Dewitt | VA |
| USDTI | Dewittville | NY |
| USDWE | Dewy Rose | GA |
| USDXP | Dexter | KS |
| USXFB | Dexter | ME |
| USYDX | Dexter | MI |
| USDXE | Dexter | MO |