Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- North Dakota (7 members)
- North Korea (45 members)
- Northern Ireland (3 members)
- Northern Territory (2 members)
- Northwest Territories (1 member)
- Norway (7 members)
- Notable Colleges (25 members)
- Nova Scotia (1 member)
- Nuclear Free (149 members)
- Nuclear Nonproliferation (275 members)
- Nuclear Proliferation (216 members)
- Nuclear Weapons (299 members)
- Nunavut (1 member)
- Oakland (30 members)
- Ocean Ecosystem (232 members)
- Ocean Science (943 members)
- Ocean Sustainability (159 members)
- Oceania (43 members)
- Oceans (788 members)
- Off the Grid (92 members)
- Ohio (37 members)
- Oklahoma (18 members)
- Olympia (13 members)
- Oman (2 members)
- Online Education (526 members)
- Online Privacy (90 members)
- Ontario (70 members)
- Open Access (30 members)
- Open Space (16 members)
- Orbital Perspective (148 members)
- Ordinances (333 members)
- Oregon (98 members)
- Organic Food (56 members)
- Origins of Life (76 members)
- Ottawa (11 members)
- Overview Effect (267 members)
- Pages with ignored display titles (4 members)
- Pakistan (52 members)
- Palau (21 members)
- Panama (2 members)
- Papua New Guinea (22 members)
- Paraguay (3 members)
- Participatory Governance (44 members)
- Peace (425 members)
- Pennsylvania (56 members)
- Permaculture (172 members)
- Permafrost (2 members)
- Peru (3 members)
- Pesticides (61 members)
- Philippines (3 members)