The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Oil Extraction Facility (1 member)
- Pages containing TBD information (1 member)
- Pages using DynamicPageList3 parser function (124 members)
- Pages using Tabber parser tag (2 members)
- Pages using deprecated source tags (4 members)
- Pages with TemplateStyles errors (2 members)
- Pages with broken file links (9 members)
- Pages with graphs (2 members)
- Pages with ignored display titles (1 member)
- Pages with script errors (12 members)
- Pages with short description (14 members)
- Pages with syntax highlighting errors (9 members)
- Particle Collider (1 member)
- Patch Notes (88 members)
- Patch Notes-0.10 (2 members)
- Planets (22 members)
- Policies (4 members)
- Power Facility (6 members)
- Power Storage (2 members)
- Power Transmission (4 members)
- Preload text templates (1 member)
- Production Chain templates (0 members)
- Production Facility (3 members)
- Projects (1 member)
- Rare Material (6 members)
- Refining Facility (1 member)
- Research (3 members)
- Research Facility (1 member)
- Science Matrix (6 members)
- Smelting Facility (3 members)
- Spam blacklist (1 member)
- Strict mode modules (4 members)
- String manipulation templates (5 members)
- Stubs (0 members)
- TechInfo Pages (108 members)
- Technology (98 members)
- Template (40 members)
- Template documentation (177 members)
- Template invoked modules (28 members)
- Templates (1 member)
- Templates imported from Wikipedia (60 members)
- Templates without documentation (0 members)
- Transclusion Pages (4 members)
- Translation templates (1 member)
- Turret (2 members)
- Typing-aid templates (13 members)
- Under-construction templates (1 member)
- Unused modules (5 members)
- Upgrade (20 members)
- UpgradeInfo Pages (18 members)