The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Business (6 members)
- Candidates for deletion (23 members)
- Candidates for speedy deletion (0 members)
- Citation needed (0 members)
- Cleanup (0 members)
- Community (4 members)
- Computation Resources (2 members)
- Computational Resources (6 members)
- Copyright templates (12 members)
- Disambiguations (0 members)
- Documentation templates (48 members)
- Formatting templates (22 members)
- Front page sections (5 members)
- Hidden categories (0 members)
- Images (11 members)
- Images needing improvement (0 members)
- Infobox templates (1 member)
- Investments (6 members)
- Legal notices (3 members)
- Manufacturing (3 members)
- Mechanics (3 members)
- Media (2 members)
- Navigation templates (1 member)
- Notice templates (15 members)
- Pages to be merged (0 members)
- Pages to be moved (0 members)
- Pages with broken file links (0 members)
- Probes (1 member)
- Projects (113 members)
- Resources (3 members)
- Stage 1 (17 members)
- Stage 2 (10 members)
- Stage 3 (19 members)
- Stages (1 member)
- Strategies (8 members)
- Stubs (60 members)
- Talk (3 members)
- Templates (18 members)
- Templates with bad documentation (0 members)
- Templates with no documentation (0 members)
- Unattributed files (0 members)
- Universal Paperclips Wiki (19 members)
- User groups (12 members)
- Videos (0 members)
- Wiki maintenance (14 members)
- Wiki skin images (0 members)