| United Socialist States of America | Academic & Science |
| United States Sports Academy | Academic & Science |
| Uniformed Services Society of Anesthesiologists | Academic & Science |
| United States Student Association | Business |
| Ultimate Safety Solutions Australia Ltd | Business |
| University of Strathclyde Students' Association | Community |
| United States Sportsmen's Alliance | Community |
| United Suffolk Sheep Association | Community |
| United Suburban Schools Association | Community |
| United States Speed Association | General |
| United Service Systems Of America | General |
| United Secured States of America… | General |
| United Soviet States of America | General |
| United Special Sportsman Alliance | Governmental |
| United States Shooting Academy | Regional |
| United States Snowmobile Association | Regional |
| United States Shuffleboard Association | Regional |
| Union of Socialist States of America | Regional |
| United States Space Administration | Regional |
| United States Sailing Association | Regional |
| United States Ski And | Regional |
| United States Snooker Association | Regional |
| University Sports South Africa | Sports |
| United States Snowsport Association | Sports |
| UNITED STATES SKI Association | Sports |
| The U.S. Ski and Snowboard Association | Sports |
| United States Ski and Snowboard Association | Sports |
| United Special Sportsmen Alliance | Sports |
