The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 188 Trading Post (2 members)
- 188 Trading Post characters (9 members)
- 2009 news (12 members)
- 2010 news (38 members)
- 2011 news (12 members)
- 2012 news (12 members)
- 2013 community news (10 members)
- 2013 news (13 members)
- 2014 community news (12 members)
- 2014 news (13 members)
- 2015 community news (12 members)
- 2015 news (13 members)
- 2016 community news (12 members)
- 2016 news (13 members)
- 2017 community news (12 members)
- 2017 news (13 members)
- 2018 community news (12 members)
- 2018 news (13 members)
- 2019 community news (30 members)
- 2019 news (13 members)
- 2020 community news (23 members)
- 2020 news (13 members)
- 2021 community news (12 members)
- 2021 news (12 members)
- 2022 community news (5 members)
- 2022 news (12 members)
- 2023 news (12 members)
- 2024 news (0 members)
- ATLAS Observatory characters (4 members)
- Abandoned mines (8 members)
- Abbreviation templates (4 members)
- Abraxodyne Chemical (7 members)
- Abraxodyne Chemical characters (13 members)
- Acadia (3 members)
- Acadia characters (13 members)
- Achievement and trophy images (5 members)
- Achievements and trophies (7 members)
- Active projects (8 members)
- Actor characters (2 members)
- Actors (2 members)
- Adams Air Force Base (5 members)
- Adams Air Force Base characters (10 members)
- Add-ons (7 members)
- Adytum characters (10 members)
- Aerotech Office Park (5 members)
- Aerotech Office Park characters (7 members)
- Agatha's Station song videos (6 members)
- Agatha's Station songs (9 members)
- Airports (10 members)
- Alcohol (109 members)