How many teams won 2 World Series in a decade?

Answer 1

Here is a breakdown of multiple world champions decade by decade since 1903.

The 1900s: Chicago Cubs (2)

The 1910s: Boston Red Sox (4), Philadelphia A's (3)

The 1920s: New York Yankees (3), New York Giants (2)

The 1930s: New York Yankees (5), St. Louis Cardinals (2)

The 1940s: New York Yankees (4), St. Louis Cardinals (3)

The 1950s: New York Yankees (6), Brooklyn/Los Angeles Dodgers (2)

The 1960s: New York Yankees (2), Los Angeles Dodgers (2), St. Louis Cardinals (2)

The 1970s: Oakland A's (3), Cincinnati Reds (2), New York Yankees (2), Pittsburgh Pirates (2)

The 1980s: Los Angeles Dodgers (2)

The 1990s: New York Yankees (3), Toronto Blue Jays (2)

The 2000s: Boston Red Sox (2), New York Yankees (2)

The 2010s: San Francisco Giants (2)