| Abbreviation | Definition |
|---|---|
| BCHC | Big Cities Health Coalition |
| BCHD | Beach Cities Health District |
| BCIS | Beach Cities Interfaith Services |
| BCMC | Beach Cities Mustang Club |
| BCRE | Beach Cities Real Estate |
| BFLD | Bergenfield |
| BGC | Bonifacio Global City |
| BK | Bangkok, Thailand |
| BKNY | Brooklyn |
| BRC | Black Rock City |
| BRK | Breckenridge Colorado |
| BSCA | Bellevue Sister Cities Association |
| BVT | Breckenridge Village of Tyler |
| BX. | Bordeaux |
| BXL | Bruxelles |
| Calgz | Calgary |
| CCCA | California Contract Cities Association |
| CCCI | Cities and Climate Change Initiative |
| CCCN | Cities Connecting Children to Nature |
| CCHI | Central Cities Health Institute |