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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Mass Transit (4 members)
- Massachusetts (61 members)
- Mauritania (1 member)
- Mauritius (1 member)
- Media (313 members)
- Mediation (10 members)
- Mexico (1 member)
- Miami (5 members)
- Michigan (32 members)
- Micro-satellites (82 members)
- Micro Loans (4 members)
- Microbiology (87 members)
- Micronesia (19 members)
- Microorganism (100 members)
- Micropayments (4 members)
- Middle East (99 members)
- Millennials (31 members)
- Mineralogy (139 members)
- Minimum Wage (33 members)
- Minnesota (52 members)
- Mississippi (6 members)
- Missouri (60 members)
- Mobile (40 members)
- Mobile Internet (86 members)
- Mobile Online (32 members)
- Mobile Web (24 members)
- Model Legislation (27 members)
- Moldova (1 member)
- Monaco (1 member)
- Money in Politics (624 members)
- Mongolia (2 members)
- Montana (16 members)
- Montenegro (1 member)
- Morocco (1 member)
- Movies (29 members)
- Mozambique (1 member)
- Multilateral Development Banks (10 members)
- Multnomah County (20 members)
- Municipal Code (0 members)
- Municipal Electricity (3 members)
- Myanmar (1 member)
- Myanmar (Burma) (1 member)
- NASA (1,154 members)
- NOAA (663 members)
- NYC (23 members)
- Namibia (1 member)
- NanoRacks (50 members)
- Nashville (36 members)
- National Security (160 members)
- Natural Capital (137 members)
- Natural Resource Economics (19 members)
- Natural Resources (1,098 members)
- Natural Rights (143 members)
- Nature (285 members)
- Nauru (19 members)
- Nebraska (3 members)
- Nepal (6 members)
- Netherlands (4 members)
- Netizen (48 members)
- Networking (940 members)
- Nevada (20 members)
- New Brunswick (0 members)
- New Definitions of National Security (1,072 members)
- New Economy (414 members)
- New Hampshire (15 members)
- New Jersey (28 members)
- New Mexico (86 members)
- New South Wales (15 members)
- New Space (903 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 (1 member)
- Ocean Ecosystem (226 members)
- Ocean Science (921 members)
- Ocean Sustainability (156 members)
- Oceania (41 members)
- Oceans (761 members)