The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- America's Playground weapon images (1 member)
- America's Playground weapon paint schemes (1 member)
- America's Playground weapons (2 members)
- America's Playground workshop object images (1 member)
- America's Playground workshop objects (2 members)
- America's Playground world objects (1 member)
- Ammunition (45 members)
- Ammunition images (9 members)
- Andale (7 members)
- Andale characters (10 members)
- Android characters (2 members)
- Animal characters (17 members)
- Antagonists (69 members)
- Appalachia (11 members)
- Appalachia Radio B.E.T.A. song videos (0 members)
- Appalachia Radio song videos (42 members)
- Appalachia Radio songs (48 members)
- Appalachian factions (1 member)
- Appalachian rivers (7 members)
- April 2009 news (5 members)
- April 2010 news (22 members)
- April 2011 news (20 members)
- April 2012 news (10 members)
- April 2013 community news (4 members)
- April 2013 news (5 members)
- April 2014 community news (4 members)
- April 2014 news (5 members)
- April 2015 community news (9 members)
- April 2015 news (3 members)
- April 2016 community news (6 members)
- April 2016 news (2 members)
- April 2017 community news (8 members)
- April 2017 news (1 member)
- April 2018 community news (9 members)
- April 2018 news (1 member)
- April 2019 community news (8 members)
- April 2019 news (1 member)
- April 2020 community news (8 members)
- April 2020 news (1 member)
- April 2021 community news (10 members)
- April 2021 news (1 member)
- April 2022 community news (6 members)
- April 2022 news (1 member)
- April 2023 news (0 members)
- Aquarium of the Atlantic characters (5 members)
- ArcJet Systems (5 members)
- ArcJet Systems characters (7 members)
- ArcJet Systems technology (5 members)
- Architecture (1 member)
- Arefu (7 members)