The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Appearances (80 members)
- Appliance Drivers (15 members)
- Article management templates (4 members)
- Article stubs (0 members)
- Authors (1 member)
- BlogListingPage (0 members)
- Blog posts (1 member)
- Blue Watch firefighters (48 members)
- Books (7 members)
- Browse (16 members)
- Candidates for deletion (0 members)
- Candidates for speedy deletion (0 members)
- Cast (340 members)
- Category templates (3 members)
- Characters (3 members)
- Community (6 members)
- Content (1 member)
- Copyright (0 members)
- Crew (13 members)
- DVDs (17 members)
- Deceased Characters (14 members)
- Directors (36 members)
- Disambiguation (48 members)
- Disambiguations (0 members)
- Documentaries (3 members)
- Episodes (176 members)
- Files (2 members)
- Fire Stations (13 members)
- Firefighters (73 members)
- Forums (6 members)
- General wiki templates (34 members)
- Help (5 members)
- Help desk (2 members)
- Hidden categories (3 members)
- Image wiki templates (9 members)
- Images (5 members)
- Infobox templates (12 members)
- Leading Firefighters (8 members)
- Lists (7 members)
- Locations (1 member)
- Media (9 members)
- Music (4 members)
- New pages (0 members)
- Organisation (1 member)
- Organization (10 members)
- Pages proposed for deletion (0 members)
- Pages using duplicate arguments in template calls (1 member)
- Pages with broken file link (0 members)
- Pages with broken file links (1 member)
- Places (1 member)
- Policy (2 members)
- Producers (3 members)
- Pubs (2 members)
- Redirects (3 members)
- Senior officers (11 members)
- Series (15 members)
- Site administration (4 members)
- Site maintenance (5 members)
- Station Officers (10 members)
- Sub Officers (4 members)
- Supporting characters (139 members)
- Template documentation (65 members)
- Templates (12 members)
- Trivia (1 member)
- VHS releases (47 members)
- Videos (3 members)
- Watercooler (2 members)
- Writers (39 members)