The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- Activities (18 members)
- Aerodynamics (7 members)
- Basic (11 members)
- Big (2 members)
- Blog posts (130 members)
- Browse (1 member)
- Bug (4 members)
- Candidates for deletion (13 members)
- Celestial body (15 members)
- Community (5 members)
- Content (9 members)
- Contests (1 member)
- Control (3 members)
- DLC (29 members)
- Deleted Parts (5 members)
- Disambiguations (0 members)
- Electric (6 members)
- Engines (7 members)
- Exploit (1 member)
- Extended Missions (1 member)
- Fan Content (10 members)
- Future pages (1 member)
- Galilean Moons of Jupiter (5 members)
- Gallery (4 members)
- Gameplay (65 members)
- Giant (3 members)
- Help (0 members)
- Images (34 members)
- Landing (3 members)
- Large (9 members)
- Lists (12 members)
- Locations (1 member)
- Meta (4 members)
- Missions (2 members)
- Moons of Earth (2 members)
- Moons of Mars (4 members)
- Navigational templates (1 member)
- Other (0 members)
- Pages with broken file links (8 members)
- Pages with math errors (1 member)
- Pages with math render errors (2 members)
- Parts (50 members)
- Planets (7 members)
- Previously removed parts (2 members)
- Removed (4 members)
- SEAcorp's rocket model (0 members)
- Satellites (10 members)
- Small (7 members)
- Space (5 members)