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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Guinea (1 member)
- Guinea-Bissau (19 members)
- Guyana (19 members)
- Haiti (20 members)
- Harvard (5 members)
- Has location (2,187 members)
- Hawaii (12 members)
- Hazardous Waste (12 members)
- Hazing (17 members)
- Health (786 members)
- Heliophysics (8 members)
- Homelessness (16 members)
- Honduras (1 member)
- Hong Kong (1 member)
- Housing (54 members)
- Houston (6 members)
- Human Population (2 members)
- Human Rights (553 members)
- Hungary (4 members)
- Hydrogen-Based Energy (7 members)
- Hydrology (176 members)
- IMF (13 members)
- INDC (683 members)
- IOT (17 members)
- ISS (273 members)
- Iceland (6 members)
- Idaho (9 members)
- Illinois (71 members)
- Imported vocabulary (8 members)
- India (71 members)
- Indiana (21 members)
- Indigenous Peoples (38 members)
- Indonesia (2 members)
- Industrialization (8 members)
- Initiative and Referendum (45 members)
- Initiatives (68 members)
- International Economic Organizations (11 members)
- Internet (247 members)
- Invasive Species (8 members)
- Iowa (25 members)
- Iran (24 members)
- Iraq (20 members)
- Ireland (15 members)
- Israel (49 members)
- Italy (16 members)
- Jamaica (19 members)
- Japan (12 members)
- Jordan (3 members)
- Kansas (25 members)
- Kansas City (28 members)
- Karma (1 member)
- Kazakhstan (2 members)
- Kentucky (15 members)
- Kenya (2 members)
- Kiribati (19 members)
- Kuwait (20 members)
- Kyrgyzstan (1 member)
- LEED (21 members)
- LGBT (24 members)
- Labor Issues (124 members)
- Labor Unions (50 members)
- Labrador (1 member)
- Land Ethic (295 members)
- Land Use (129 members)
- Laos (1 member)
- Las Vegas (4 members)
- Latvia (1 member)
- Lebanon (3 members)
- Legislation (59 members)
- Lesotho (1 member)
- Liberia (1 member)
- Libya (1 member)
- Liechtenstein (1 member)
- Light Pollution (9 members)
- Links (4 members)
- Lisbon (2 members)
- Lithuania (1 member)
- Living Wage (74 members)
- Location (206 members)
- London (3 members)
- Los Angeles (12 members)
- Louisiana (16 members)
- Luxembourg (1 member)
- Macalester College (5 members)
- Macedonia (1 member)
- Madagascar (3 members)
- Madison (11 members)
- Maine (29 members)
- Maker Movement (7 members)
- Malawi (1 member)
- Malaysia (1 member)
- Maldives (20 members)
- Mali (1 member)
- Malta (1 member)
- Manila (1 member)
- Manitoba (1 member)
- Maps (604 members)
- Marijuana (9 members)
- Marin County (10 members)
- Marshall Islands (27 members)
- Maryland (37 members)
- Mass Transit (4 members)
- Massachusetts (61 members)
- Mauritania (1 member)
- Mauritius (1 member)
- Media (301 members)
- Mediation (10 members)
- Mexico (1 member)
- Miami (5 members)
- Michigan (32 members)
- Micro-satellites (82 members)
- Micro Loans (4 members)
- Microbiology (86 members)
- Micronesia (19 members)
- Microorganism (98 members)
- Micropayments (4 members)
- Middle East (92 members)
- Millennials (31 members)
- Mineralogy (138 members)
- Minimum Wage (33 members)
- Minnesota (52 members)
- Mississippi (6 members)
- Missouri (60 members)
- Mobile (40 members)
- Mobile Internet (85 members)
- Mobile Online (31 members)
- Mobile Web (24 members)
- Model Legislation (26 members)
- Moldova (1 member)
- Monaco (1 member)
- Money in Politics (605 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 (1,128 members)
- NOAA (641 members)
- NYC (23 members)
- Namibia (1 member)
- NanoRacks (50 members)
- Nashville (36 members)
- National Security (160 members)
- Natural Capital (136 members)
- Natural Resource Economics (19 members)
- Natural Resources (1,079 members)
- Natural Rights (141 members)
- Nature (277 members)
- Nauru (19 members)
- Nebraska (3 members)
- Nepal (6 members)
- Netherlands (4 members)
- Netizen (48 members)
- Networking (921 members)
- Nevada (20 members)
- New Brunswick (0 members)
- New Definitions of National Security (1,048 members)
- New Economy (403 members)
- New Hampshire (15 members)
- New Jersey (28 members)
- New Mexico (85 members)
- New South Wales (15 members)
- New Space (890 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 (5 members)
- North America (39 members)
- North Carolina (68 members)
- North Dakota (7 members)
- North Korea (39 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 (144 members)
- Nuclear Nonproliferation (263 members)
- Nuclear Proliferation (207 members)
- Nuclear Weapons (290 members)
- Nunavut (1 member)
- Oakland (30 members)
- Ocean Ecosystem (223 members)
- Ocean Science (904 members)
- Ocean Sustainability (154 members)
- Oceania (41 members)
- Oceans (741 members)
- Off the Grid (91 members)
- Ohio (37 members)
- Oklahoma (17 members)
- Olympia (13 members)
- Oman (2 members)
- Online Education (491 members)
- Online Privacy (88 members)
- Ontario (70 members)
- Open Access (30 members)
- Open Space (16 members)
- Orbital Perspective (139 members)
- Ordinances (329 members)
- Oregon (98 members)
- Organic Food (56 members)
- Origins of Life (75 members)
- Ottawa (11 members)
- Overview Effect (259 members)
- Pages with ignored display titles (4 members)
- Pakistan (43 members)
- Palau (19 members)
- Panama (2 members)
- Papua New Guinea (20 members)
- Paraguay (3 members)
- Participatory Governance (41 members)
- Peace (407 members)
- Pennsylvania (56 members)
- Permaculture (171 members)
- Permafrost (2 members)
- Peru (3 members)
- Pesticides (61 members)
- Philippines (3 members)
- PlanetLabs (182 members)
- Planet API (240 members)
- Planet Citizen (2,056 members)
- Planet Citizens (1,339 members)
- Planet Citizens, Planet Scientists (1,760 members)
- Planet Scientist (734 members)
- Planetary Science (398 members)
- Plastic Pollution (62 members)
- Poland (3 members)
- Policies (760 members)
- Pollution (222 members)
- Population (17 members)
- Portland (21 members)
- Portugal (1 member)
- Potsdam Institute (11 members)
- Predatory Lending (11 members)
- Prince Edward Island (1 member)
- Princeton (6 members)
- Privacy Rights (66 members)