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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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 (2,055 members)
- Planet Citizens (1,339 members)
- Planet Citizens, Planet Scientists (1,759 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)
- Programs (412 members)
- Provinces (15 members)
- Puerto Rico (1 member)
- Qatar (24 members)
- Quebec (10 members)
- Queensland (12 members)
- Radioactive Pollution (83 members)
- Radioactive Waste (68 members)
- Rain Forest (13 members)
- Rainforest (369 members)
- Recycling (159 members)
- Redistricting (32 members)
- Referendums (5 members)
- Renewable Energy (1,102 members)
- Republic of the Congo (2 members)
- Resilience (1,125 members)
- Resolution (0 members)
- Resolutions (673 members)
- Rhode Island (11 members)
- Rice University (8 members)
- Rights of Nature (141 members)
- Risk Management (4 members)
- Rivers (34 members)
- Romania (1 member)
- Rome (2 members)
- Roscosmos (1 member)
- Russian Federation (175 members)
- Rwanda (1 member)
- Saint Kitts and Nevis (19 members)
- Saint Lucia (19 members)
- Saint Vincent and the Grenadines (19 members)
- Samoa (20 members)
- San Francisco (63 members)
- San Marino (1 member)
- Santa Cruz (14 members)
- Santa Fe (18 members)
- Santa Monica (4 members)
- Sao Tome and Principe (19 members)
- Saskatchewan (1 member)
- Saudi Arabia (26 members)
- Savannah (1 member)
- School Districts (57 members)
- Scotland (11 members)
- Sea-Level Rise & Mitigation (831 members)
- Sea-level Rise (616 members)
- Seattle (40 members)
- Seattle Univ (6 members)
- Senegal (1 member)
- Serbia (1 member)
- Seventh Generation Sustainability (403 members)
- Seychelles (19 members)
- Sharing Economy (17 members)
- Sierra Leone (2 members)
- Simple Living (36 members)
- Singapore (21 members)
- Slovakia (1 member)
- Slovenia (1 member)
- Small Island Developing States (20 members)
- Smart Growth (31 members)
- Smart Homes (18 members)
- Smoking (50 members)
- Social Justice (458 members)
- Soil (451 members)
- Soil Pollution (12 members)
- Solar Energy (844 members)
- Solomon Islands (19 members)
- Somalia (2 members)
- South Africa (7 members)
- South America (18 members)
- South Australia (2 members)
- South Carolina (25 members)
- South Dakota (5 members)
- South Korea (3 members)
- South Sudan (1 member)
- Space Pollution (1 member)
- Space Science and Space Physics (333 members)
- Spain (7 members)
- Special Districts (13 members)
- Sri Lanka (1 member)
- St. Lawrence Univ (5 members)
- Stanford (8 members)
- Stardust (70 members)
- State (112 members)
- State of Palestine (6 members)
- Stormwater (10 members)
- Strategic Demands (1,426 members)
- Streams (6 members)
- Sudan (2 members)
- Suriname (1 member)
- Sustainability (987 members)
- Sustainability Policies (1,631 members)
- Swaziland (1 member)
- Sweden (6 members)
- Switzerland (3 members)
- Syria (3 members)
- TEEB (10 members)
- Taiwan (2 members)
- Tajikistan (1 member)
- Takoma Park (14 members)
- Tanzania (1 member)
- Taos (11 members)
- Tasmania (10 members)
- Tax-Related (18 members)
- Tennessee (43 members)
- Texas (84 members)
- Thailand (2 members)
- Thermal Pollution (5 members)
- ThinBlueLayer (666 members)
- Think Tank (1 member)
- Threat Multiplier (547 members)
- Tidal Power (2 members)
- Togo (1 member)
- Tompkins County (10 members)
- Tonga (1 member)
- Topic (122 members)
- Toronto (34 members)
- Townships (15 members)
- Toxics and Pollution (115 members)
- Transportation (270 members)
- Trees and Forests (61 members)
- Tribal Governing Bodies (7 members)
- Trinidad and Tobago (1 member)
- Trucost (11 members)
- Tunisia (1 member)
- Turkey (1 member)
- Turkmenistan (1 member)
- Tuvalu (2 members)
- UC Berkeley (5 members)
- UK (77 members)
- US (760 members)
- US Environmental Protection Agency (808 members)
- Uganda (1 member)
- Ukraine (67 members)
- United Arab Emirates (21 members)
- United Kingdom (27 members)
- United Nations (553 members)
- United Nations Development Group (10 members)
- United Nations Economic and Social Council (10 members)
- United Nations Framework Convention on Climate Change (59 members)
- United States (153 members)
- Univ of Buffalo (5 members)
- Univ of Montana (7 members)
- Urban Gardening (46 members)
- Uruguay (1 member)
- Utah (16 members)
- Uzbekistan (1 member)
- Vanuatu (2 members)
- Vatican City (1 member)
- Venezuela (4 members)
- Vermont (21 members)
- Victoria (7 members)
- Vietnam (11 members)
- Virginia (23 members)
- Virtual Earth (85 members)
- Virtual Planet (97 members)
- Virtual Reality (18 members)
- Visual Pollution (4 members)
- Voting (96 members)
- Voting Rights (102 members)
- Voting Systems (102 members)
- WTO (4 members)
- WWU (5 members)
- Wales (3 members)
- Warfare and the Environment (6 members)
- Warsaw (1 member)
- Washington (182 members)
- Washington DC (6 members)
- Waste Management (4 members)
- Wastewater Treatment (13 members)
- Water (259 members)
- Water Pollution (54 members)
- Water Quality (482 members)
- Water Saving (94 members)
- Watersheds (46 members)
- West Virginia (33 members)
- Western Asia (6 members)
- Western Australia (4 members)
- Wetlands (148 members)
- Whole Earth (1,619 members)
- Wildlife (264 members)
- William and Mary (5 members)
- Wind Energy (459 members)
- Wind Power (30 members)
- Wisconsin (49 members)
- Women's Issues (33 members)
- Women's Rights (102 members)
- Women and Gender (64 members)
- Workers Rights (80 members)
- Workplace Regulations (10 members)
- World Bank (320 members)
- World Bank Group (10 members)
- World Wide Web (682 members)
- Wyoming (8 members)
- Yemen (2 members)
- Youth (711 members)
- Yukon Territory (1 member)
- Zambia (2 members)
- Zero Waste (28 members)
- Zimbabwe (3 members)
- Zoology (33 members)