• 20th century in California by city (21 C)

/

• 20th-century disestablishments in California (10 C, 1 P)
• 20th-century establishments in California (10 C, 2 P)

0–9

• 1900s in California (16 C, 7 P)
• 1910s in California (16 C, 6 P)
• 1920s in California (15 C, 8 P)
• 1930s in California (17 C, 10 P)
• 1940s in California (17 C, 75 P)
• 1950s in California (15 C, 6 P, 1 F)
• 1960s in California (18 C, 9 P)
• 1970s in California (18 C, 12 P)
• 1980s in California (20 C, 6 P)
• 1990s in California (22 C, 4 P)

E

• 20th-century executions by California (27 P)

L

• 20th century in Los Angeles County, California (7 C, 6 P)

O

• 20th century in Orange County, California (5 C, 2 P)

P

• 20th-century people from California (2 C, 23 P)

S

• 20th century in sports in California (10 C)

Y

• Years of the 20th century in California (100 C)

*

• Cement, California
• History of California (1900–present)

0–9

• 1998 World Polo Championship

M

• Mesa Oil Field

P

• Painted Cave Fire

R

• Royal Lichtenstein Quarter-Ring Sidewalk Circus

S

• Santa Barbara Dodgers
• 1925 Santa Barbara earthquake