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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 (408 members)
- Pennsylvania (56 members)
- Permaculture (171 members)
- Permafrost (2 members)
- Peru (3 members)
- Pesticides (61 members)
- Philippines (3 members)
- PlanetLabs (183 members)
- Planet API (241 members)
- Planet Citizen (2,057 members)
- Planet Citizens (1,341 members)
- Planet Citizens, Planet Scientists (1,764 members)
- Planet Scientist (734 members)
- Planetary Science (398 members)
- Plastic Pollution (62 members)
- Poland (3 members)
- Policies (760 members)
- Pollution (225 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 (84 members)
- Radioactive Waste (68 members)
- Rain Forest (13 members)
- Rainforest (369 members)
- Recycling (160 members)
- Redistricting (32 members)
- Referendums (5 members)
- Renewable Energy (1,102 members)
- Republic of the Congo (2 members)
- Resilience (1,126 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 (35 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)