| Code | Name | Region |
|---|---|---|
| USUCB | Boulder Creek | CA |
| USVBF | Boulevard | CA |
| USBBK | Bound Brook | NJ |
| USBYA | Boundary | AK |
| USBPF | Boundary | WA |
| USBTF | Bountiful | UT |
| USQRB | Bourbon | IN |
| USB8N | Bourbon | MO |
| USRGP | Borger | TX |
| USBHG | Boring | OR |
| USRLU | Bornite | AK |
| USBJO | Boron | CA |
| USBXS | Borrego Springs | CA |
| USOSE | Boscawen | NH |
| USBBE | Boscobel | WI |
| USBL5 | Bosler | WY |
| USBQR | Bosque Farms | NM |
| US2BO | Boss | MO |
| USBSR | Bossier City | LA |
| USBX4 | Bostic | NC |
| USBZD | Boston | GA |
| USTQN | Boston | KY |
| USBOS | Boston | MA |
| USYBS | Boston | NY |
| USZHN | Boston | PA |
| USOWQ | Boston | TX |
| USBSN | Boston | VA |
| USB5H | Boston Heights | OH |
| USBO2 | Booker | TX |
| USB88 | Boomer | NC |
| USB9O | Boone | CO |
| USBNW | Boone | IA |
| USXCP | Boone | NC |
| US8MV | Boones Mill | VA |
| USBOQ | Booneville | AR |
| USBOO | Booneville | MS |
| USB3O | Boonsboro | MD |
| USBTB | Boonton | NJ |
| USOXJ | Boonville | CA |
| USBVQ | Boonville | IN |
| USBVM | Boonville | MO |
| USBVL | Boonville | NC |
| USBO9 | Boonville | NY |
| USOBX | Boothbay | ME |
| USOYH | Boothbay Harbor | ME |
| USXDA | Boothwyn | PA |
| USBDI | Borden | IN |
| USBOJ | Bordentown | NJ |
| USBOU | Bonduel | WI |
| USNDU | Bondurant | IA |