| Code | Name | Region |
|---|---|---|
| USRBF | Big Bear | CA |
| USBBL | Big Bear Lake | CA |
| USB3B | Big Bend | CA |
| USBB4 | Big Bend | TX |
| USGYQ | Big Bend | WI |
| USIXB | Big Cabin | OK |
| USBIC | Big Creek | AK |
| USGC8 | Big Creek | WV |
| USBIG | Big Delta | AK |
| USAFP | Big Flats | NY |
| USBH8 | Big Horn | WY |
| USXCD | Big Island | VA |
| USBGQ | Big Lake | AK |
| USBL4 | Big Lake | MN |
| USGQB | Big Lake | TX |
| USBMX | Big Mountain | AK |
| USBMO | Big Mountain | MN |
| USBPY | Big Pine Key | FL |
| USBEX | Bethlehem | PA |
| USBPA | Bethpage | NY |
| USBTE | Bethune | SC |
| USBTD | Bettendorf | IA |
| USBTT | Bettles | AK |
| USQBT | Bettsville | OH |
| USXUL | Beulah | ND |
| USBCL | Beulaville | NC |
| USBVY | Beverly | MA |
| USXDF | Beverly | NJ |
| USBVR | Beverly | OH |
| USVBY | Beverly | WA |
| USEVY | Beverly | WV |
| USBVH | Beverly Hills | CA |
| USYHL | Beverly Hills | FL |
| USBH3 | Beverly Hills | MI |
| USBVG | Bevington | IA |
| USIKM | Bickmore | WV |
| USICB | Bicknell | IN |
| USBDJ | Biddeford | ME |
| USBET | Bethel | AK |
| USBTJ | Bethel | CT |
| USEQB | Bethel | ME |
| US4BE | Bethel | MO |
| USBZJ | Bethel | NY |
| USTZH | Bethel | NY |
| USBTG | Bethel | PA |
| USXBV | Bethel | VT |
| USBH6 | Bethel Heights | AR |
| USXTD | Bethel Island | CA |
| USTKP | Bethel Park | PA |
| USBHU | Bethel, Clermont | OH |