Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Has location (2,185 members)
- Hawaii (12 members)
- Hazardous Waste (12 members)
- Hazing (17 members)
- Health (799 members)
- Heliophysics (8 members)
- Homelessness (16 members)
- Honduras (1 member)
- Hong Kong (1 member)
- Housing (55 members)
- Houston (6 members)
- Human Population (2 members)
- Human Rights (558 members)
- Hungary (4 members)
- Hydrogen-Based Energy (7 members)
- Hydrology (177 members)
- IMF (13 members)
- INDC (664 members)
- IOT (17 members)
- ISS (276 members)
- Iceland (6 members)
- Idaho (9 members)
- Illinois (71 members)
- Imported vocabulary (8 members)
- India (72 members)
- Indiana (21 members)
- Indigenous Peoples (39 members)
- Indonesia (2 members)
- Industrialization (8 members)
- Initiative and Referendum (46 members)
- Initiatives (70 members)
- International Economic Organizations (11 members)
- Internet (255 members)
- Invasive Species (8 members)
- Iowa (25 members)
- Iran (30 members)
- Iraq (25 members)
- Ireland (15 members)
- Israel (51 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)