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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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 (337 members)
- Spain (7 members)
- Special Districts (13 members)
- Sri Lanka (1 member)
- St. Lawrence Univ (5 members)
- Stanford (8 members)
- Stardust (70 members)
- State (113 members)
- State of Palestine (7 members)
- Stormwater (10 members)
- Strategic Demands (1,452 members)
- Streams (6 members)
- Sudan (2 members)
- Suriname (1 member)
- Sustainability (998 members)
- Sustainability Policies (1,653 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 (6 members)
- ThinBlueLayer (675 members)
- Think Tank (1 member)
- Threat Multiplier (565 members)
- Tidal Power (2 members)
- Togo (1 member)
- Tompkins County (10 members)
- Tonga (1 member)
- Topic (124 members)
- Toronto (34 members)
- Townships (15 members)
- Toxics and Pollution (117 members)
- Transportation (276 members)
- Trees and Forests (62 members)