The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Building icons (16 members)
- Buildings (9 members)
- Candidates for deletion (1 member)
- Candidates for speedy deletion (0 members)
- Celestial (8 members)
- Celestial Wiki (8 members)
- Citation needed (0 members)
- Cleanup (0 members)
- Community (5 members)
- Copyright templates (12 members)
- Crafting buildings (1 member)
- Disambiguations (0 members)
- Documentation templates (3 members)
- Energy production buildings (1 member)
- Energy storage buildings (1 member)
- Formatting templates (22 members)
- Front page sections (3 members)
- Guides (2 members)
- Hidden categories (0 members)
- Images (6 members)
- Images needing improvement (0 members)
- Infobox part templates (7 members)
- Infobox templates (3 members)
- Infographics (1 member)
- Legal notices (3 members)
- Logos (1 member)
- Media (2 members)
- Navigation templates (3 members)
- Notice templates (14 members)
- Pages to be merged (0 members)
- Pages to be moved (0 members)
- Pages with broken file links (0 members)
- Screenshots (8 members)
- Storage buildings (1 member)
- Stubs (8 members)
- Talk templates (1 member)
- Template documentation (58 members)
- Templates (18 members)
- Templates with bad documentation (0 members)
- Templates with no documentation (0 members)
- UI screenshots (2 members)
- Unattributed files (0 members)
- User groups (17 members)
- Utility buildings (2 members)
- Videos (0 members)
- Wiki maintenance (14 members)
- Wiki skin images (3 members)