What years did the Philadelphia-Oakland Athletics win the World Series?

Answer 1

The Oakland A's went to the World Series in 1972, 1973, and 1974 (winning all 3), and again in 1988, 1989, and 1990 (winning in 1989).

This does not include the A's years in Philadelphia (8 more appearances: 1905, 1910, 1911, 1913, 1914, 1929, 1930, 1931 -- winning in 1910, 1911, 1913, 1929, and 1930), or their years in Kansas City (no World Series appearances).

Answer 2

As of the start of the 2011 season, the A's won the World Series while in Oakland in 1989, 1974, 1973, and 1972 and won while in Philadelphia in 1930, 1929, 1913, 1911, and 1910.

Answer 3

The A's swept their Bay Area rivals, the San Francisco Giants, in four games in 1989.