| Abbreviation | Definition |
|---|---|
| BCSA | Berks County Swim Association |
| BDA | Blue Dolphin Aquatics |
| BLSC | Blyth lifeguard and swimming club |
| BMSS | Bolton Metro Swimming Squad |
| BRSA | Bow River Swim Association |
| BS | Big Swimmers |
| BSL | Birmingham Swim League |
| BST | Bishop Swim Team |
| BUSA | British Underwater Sports Association |
| BYST | Bremerton YMCA Swim Team |
| CAOU | Centro Acuatico Olimpico Universitario |
| CCSA | Coastal Collegiate Swimming Association |
| CCSF | Catalina Channel Swimming Federation |
| CCST | Counsilman Center Swim Team |
| CESA | Controlled Emergency Swimming Ascent |
| CIASA | Cayman Islands Amateur Swimming Association |
| CISC | Caribbean Island Swimming Championships |
| CLEC | Chad Le Clos |
| CMSA | City of Mobile Swim Association |
| CMSL | Central Maryland Swim League |