The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Bank (6 members)
- Blog posts (0 members)
- Browse (7 members)
- Candidates for deletion (0 members)
- Chemicals (5 members)
- Community (6 members)
- Company (30 members)
- Disambiguations (0 members)
- Engineering (11 members)
- Farming (5 members)
- Farming and forestry (5 members)
- Finance (4 members)
- Forums (6 members)
- Fuels (4 members)
- General (8 members)
- General information (0 members)
- General wiki templates (1 member)
- Getting started (3 members)
- Help (7 members)
- Help desk (2 members)
- ICT (2 members)
- Images (0 members)
- Industries (61 members)
- Machinery (12 members)
- Metals (6 members)
- Mining (7 members)
- Natural resources (5 members)
- Office (4 members)
- Ores (6 members)
- Petrochemistry (8 members)
- Products (60 members)
- Start of game strategies (1 member)
- Steel sector (8 members)
- Storage (2 members)
- Strategy (2 members)
- Stubs (23 members)
- Template documentation (28 members)
- Templates (28 members)
- Temporary (7 members)
- Utilities (6 members)
- Videos (2 members)
- Waste (4 members)
- Waste management (3 members)
- Watercooler (2 members)