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| UK Directory | Submit | Search |
| UK Student Home Pages | N/A | Search |
| United Links (Austria) | N/A | Search |
| Up Front Entertainment (recipro. Link Required) | Submit | Search |
| USA Online | Submit | Search |
| USA Restaurant Guide | Submit | Search |
| USA Today | N/A | Search |
| Use It! | N/A | Search |
| UK Index | Submit | Search |
| Ultimate Band List | Submit | Search |
| Unified Computer Science Tech. Reports | Submit | Search |
| UNIXHelp | N/A | Search |
| USDA Plants Database | N/A | Search |
| UCS Knowledge Base (Indiana University) | Submit | Search |
| US Robotics | N/A | Search |
| U.S. Patents | N/A | Search |
| U.S. Business Advisor Search of GovBot Database (searches multiple government websites at once) | N/A | Search |
| U.S. Intelligence Community | N/A | Search |
| U.S. Federal Register | N/A | Search |
| United Nations | N/A | Search |
| U.S. Census Bureau (by word) | N/A | Search |
| U.S. Census Bureau (by place) | N/A | Search |
| US Circuit Court of Appeals | N/A | Search |
| U.S. Constitution | N/A | Search |
| U.S. Dept of Health and Human Services | N/A | Search |
| U.S. Bureau of Labor Statistics | N/A | Search |
| U.S. Dept of Defense | N/A | Search |
| U.S. Air Force | N/A | Search |
| United Parcel Service | N/A | Search |
| UK Business on the Web | Submit | Search |
| The UK Shopping City | N/A | Search |
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