| Code | Name | Region |
|---|---|---|
| USBM9 | Birmingham Road Estates | GA |
| USRMT | Birmingport | AL |
| USWO4 | Birnamwood | WI |
| USBI7 | Birney | MT |
| USBI3 | Biron | WI |
| USBSQ | Bisbee | AZ |
| US5BP | Biscayne Park | FL |
| USBDS | Biscoe | NC |
| USBI5 | Bigler | PA |
| USBIP | Biglerville | PA |
| USBMS | Billerica | MA |
| USBGS | Billings | MO |
| USBIL | Billings | MT |
| USB5Y | Billingsley | AL |
| USBIX | Biloxi | MS |
| USIQF | Binford | ND |
| USXCF | Bingen | WA |
| USAFM | Bingham | ME |
| USYUU | Bingham Canyon | UT |
| USGHF | Bingham Farms | MI |
| USBH2 | Binghampton | IL |
| USBIO | Binghamton | NY |
| USIGH | Binghamton | WI |
| USBGM | Binghamton-endicott-johnson City Apt | NY |
| USZA6 | Biola | CA |
| USKBC | Birch Creek | AK |
| USBI4 | Birch Hills | NJ |
| USZZI | Birch Run | MI |
| USBPI | Big Piney | WY |
| USBZR | Big Prairie | OH |
| USWBR | Big Rapids | MI |
| USB7R | Big Rock | IL |
| USBR6 | Big Rock | VA |
| USBSM | Big Sandy | MT |
| USBIY | Big Sandy | TN |
| USB5S | Big Sky | MT |
| USHCA | Big Spring | TX |
| USIGS | Big Stone | DE |
| USGQJ | Big Stone City | SD |
| USIHG | Big Stone Gap | VA |
| USGSW | Big Sur | CA |
| USB3T | Big Timber | MT |
| US2BT | Big Tree | NY |
| USBWH | Bigelow | AR |
| USIFK | Bigfork | AR |
| USIGK | Bigfork | MN |
| USBF4 | Bigfork | MT |
| USISX | Biggs | CA |
| USBW2 | Bidwell | OH |
| USJSF | Bieber | CA |