The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 11th Founding (8 members)
- 12th Founding (11 members)
- 13th Founding (21 members)
- 14th Founding (2 members)
- 15th Founding (5 members)
- 16th Founding (1 member)
- 17th Founding (0 members)
- 18th Founding (2 members)
- 19th Founding (5 members)
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- 21st Founding (55 members)
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- 26th Founding (17 members)
- 2nd Founding (19 members)
- 3rd Founding (45 members)
- 404 found (1 member)
- 40kfan (1 member)
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- 4th Founding (41 members)
- 501st Cordanian MIR (12 members)
- 519th legion (1 member)
- 5th Founding (9 members)
- 6th Founding (4 members)
- 7th Founding (8 members)
- 8th Founding (15 members)
- 9th Founding (7 members)
- A7K4B4N (3 members)
- A Sentient Toaster (2 members)
- Aa33457 (7 members)
- AaronWilson2018 (5 members)
- Abhumans (17 members)
- Abyss Stalkers (73 members)
- Accentors (1 member)
- AceOfSpades76 (1 member)
- Achilles Prime (1,120 members)
- Aclionius Cornius (16 members)
- Adeex9944 (1 member)
- Adepta Sororitas (202 members)
- Adepta Sororitas Characters (2 members)
- Adepta Sororitas Homeworlds (3 members)
- Adepta Sororitas Orders (42 members)
- Adepto Tech (2 members)
- Adepts (2 members)
- Adeptus Arbites (2 members)