| Code | Name | Region |
|---|---|---|
| USDNB | Dunedin | FL |
| USDUL | Dunellen | NJ |
| USDKD | Dunkirk | IN |
| USK44 | Dunkirk | MD |
| USDKK | Dunkirk | NY |
| USDKI | Dunkirk | OH |
| USDZP | Dunlap | IA |
| USDJR | Dunlap | IL |
| USULJ | Dunlap | IN |
| USUNL | Dunlap | TN |
| USDNZ | Dunmore | PA |
| USDU3 | Dunmore | WV |
| USDUZ | Dunn | NC |
| USDUM | Dunn | SC |
| USDFU | Dunnellon | FL |
| USDIG | Dunnigan | CA |
| USDNV | Dunnville | KY |
| USDUN | Dunseith | ND |
| USDSE | Dunstable | MA |
| USDW3 | Dunwoody | GA |
| USDB8 | Dunbar | PA |
| USDBJ | Dunbar | WI |
| USDWV | Dunbar | WV |
| USDUE | Dunbridge | OH |
| USD7C | Duncan | NE |
| USDUC | Duncan | OK |
| USDNK | Duncan | SC |
| USZC4 | Duncan Falls | OH |
| USDMX | Duncans Mills | CA |
| USDUV | Duncansville | PA |
| USDV3 | Duncanville | TX |
| USDU7 | Duncombe | IA |
| USDDQ | Dundalk | MD |
| USUDS | Dundas | MN |
| USDYU | Dundee | FL |
| USDYI | Dundee | IL |
| USDND | Dundee | MI |
| USDYK | Dundee | NY |
| USDE4 | Dundee | OH |
| USUEZ | Dundee | OR |
| USDCO | Ducor | CA |
| USDKU | Dudley | MA |
| USUD4 | Dudley | MO |
| USDHU | Dudley | NC |
| USD2G | Duenweg | MO |
| USDUD | Duffield | VA |
| USDU2 | Dufur | OR |
| USDG2 | Dugspur | VA |
| USDPG | Dugway | UT |
| USDUK | Duke | OK |