The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Category management templates (3 members)
- Category namespace templates (1 member)
- Cesty (0 members)
- Check for country specific content (0 members)
- China-中国 (1 member)
- Cleanup templates (3 members)
- Client Applications (7 members)
- Closure (1 member)
- Colorado (0 members)
- CommonState (0 members)
- Communication templates (2 members)
- Community Administration (1 member)
- Computer keys (1 member)
- Connecticut (0 members)
- Construcción (3 members)
- Construction (57 members)
- Convert to Subpages (3 members)
- Countries (29 members)
- Country list (2 members)
- Cross-reference templates (1 member)