| USCA | Ulster Special Constabulary Association 
| Others |
| USCA | Ultimate Street Car Association
| Others |
| USCA | Ultra-Sound Contrast Agent
| Others |
| USCA | Ulva School Community Association
| Others |
| USCA | United Schutzhund Clubs of America
| Others |
| USCA | United SideCar Association
| Others |
| USCA | United Sprint Car Association
| Others |
| USCA | United States Canoe Association
| Others |
| USCA | United States Cattlemen's Association
| Others |
| USCA | United States Chess Academy
| Others |
| USCA | United States Climate Alliance
| Others |
| USCA | United States Code Annotated
| Others |
| USCA | United States Conference on AIDS
| Others |
| USCA | United States Court of Appeals
| Others |
| USCA | United States Croquet Association
| Others |
| USCA | United States Curling Association
| Others |
| USCA | United States of Canada Actually
| Others |
| USCA | University of South Carolina Aiken
| Others |
| USCA | University of Spa and Cosmetology Arts
| Others |
| USCA | University Students Cooperative Association
| Others |
| USCA | University Students' Cooperative Association
| Others |
| USCA | Utah School Counselor Association
| Others |