The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- USA states (14 members)
- USSR (0 members)
- US News Outlets (1 member)
- US politician memes (4 members)
- UT Austin (1 member)
- Ukrainian collaborators with Nazi Germany (1 member)
- Ultra-left YouTube channels (2 members)
- Unfinished transcripts (2 members)
- Unfree labor (1 member)
- Union of Soviet Socialist Republics (6 members)
- Union songs (2 members)
- United Nations (4 members)
- United States (0 members)
- United States Army personnel (2 members)
- United States Attorneys for the District of Columbia (1 member)
- United States Congress (1 member)
- United States Navy personnel (1 member)
- United States Secretaries of State (4 members)
- United States of America (29 members)
- Universities (1 member)