• Categories by parameter (28 C)

C

• Wikipedia categories that should not contain articles (7 C)
• Container categories (54,298 C)

D

• Disambiguation categories (2,551 C)

E

• Edit statistics user templates (1 P)
• Eponymous categories (15 C)

H

• Hidden categories (37,805 C)

M

• Maintenance categories (14 C)

N

• Namespace-specific categories (8 C)
• Wikipedia non-diffusing subcategories (22,362 C)
• Wikipedia non-diffusing parent categories (3,702 C, 2 P)

R

• All redirect categories (4,322 C)

S

• Set categories (36,988 C)
• Wikipedia soft redirected categories (168,546 C)
• Wikipedia categories sorted by month (1 C)

T

• Tracking categories (25,460 C, 1 P)