| Code | Name | Region |
|---|---|---|
| USQXA | Bloomsdale | MO |
| USURG | Blossburg | PA |
| USBI8 | Blount Island | FL |
| USB7T | Blounts Creek | NC |
| USUTW | Blountstown | FL |
| USUTB | Blountsville | AL |
| USOUI | Blountville | TN |
| USBWK | Blowing Rock | NC |
| USB5X | Bloxom | VA |
| USBQJ | Blue Anchor | NJ |
| USXDC | Blue Ash | OH |
| USBB5 | Blue Ball | PA |
| USQAL | Blue Ball | PA |
| USBBX | Blue Bell | PA |
| USBLU | Blue Canyon | CA |
| USNUU | Blue Diamond | NV |
| USLUF | Blue Earth | MN |
| USBFB | Blue Fox Bay | AK |
| USBMN | Bloomfield | NJ |
| USB9F | Bloomfield | NM |
| USBF7 | Bloomfield | NY |
| USOFH | Bloomfield Hills | MI |
| USBPS | Blooming Prairie | MN |
| USBMB | Bloomingburg | NY |
| USBBU | Bloomingburg | OH |
| USBMD | Bloomingdale | GA |
| USOMI | Bloomingdale | IL |
| USB87 | Bloomingdale | IN |
| USBGL | Bloomingdale | NJ |
| USOGL | Bloomingdale | OH |
| USBQT | Bloomington | CA |
| USB2L | Bloomington | IL |
| USBMG | Bloomington | IN |
| USB2M | Bloomington | MD |
| USBQI | Bloomington | MN |
| USBMR | Bloomington | NY |
| USBLO | Bloomington | TX |
| USBMI | Bloomington-normal Apt | IL |
| USLJD | Blasdell | NY |
| USBUY | Blauvelt | NY |
| USLXW | Blawnox | PA |
| USKYB | Blaze | KY |
| USIBH | Bleiblerville | TX |
| USBLS | Blissfield | MI |
| USISF | Blissfield | OH |
| USBID | Block Island | RI |
| USKHR | Blocker | OK |
| USBZG | Blodgett Mills | NY |
| USOGT | Blomkest | MN |
| US8BB | Bloomburg | TX |