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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Natural Rights (143 members)
- Nature (285 members)
- Nauru (19 members)
- Nebraska (3 members)
- Nepal (6 members)
- Netherlands (4 members)
- Netizen (48 members)
- Networking (933 members)
- Nevada (20 members)
- New Brunswick (0 members)
- New Definitions of National Security (1,063 members)
- New Economy (408 members)
- New Hampshire (15 members)
- New Jersey (28 members)
- New Mexico (85 members)
- New South Wales (15 members)
- New Space (897 members)
- New Transcendentalists (6 members)
- New York (126 members)
- New Zealand (62 members)
- Newfoundland (1 member)
- Nicaragua (1 member)
- Niger (1 member)
- Nigeria (1 member)
- Niue (19 members)
- Noise Pollution (6 members)
- North America (40 members)
- North Carolina (68 members)
- North Dakota (7 members)
- North Korea (40 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 (145 members)
- Nuclear Nonproliferation (268 members)
- Nuclear Proliferation (210 members)
- Nuclear Weapons (293 members)
- Nunavut (1 member)
- Oakland (30 members)
- Ocean Ecosystem (225 members)
- Ocean Science (911 members)
- Ocean Sustainability (156 members)
- Oceania (41 members)
- Oceans (751 members)
- Off the Grid (91 members)
- Ohio (37 members)
- Oklahoma (17 members)