What is the top 10 list World Series appearances?

Including 2012 (Giants/Tigers), they are:

1. NY Yankees (40)

2. NY/SF Giants (19)

3. (Tie) Brooklyn/LA Dodgers, St. Louis Cardinals (18)

4. Phil./KC/Oakland A's (14)

5. (Tie) Boston Americans/Red Sox, Detroit Tigers (11)

6. Chicago Cubs (10)

7. (Tie) Boston/Milwaukee/Atlanta Braves, Cincinnati Reds (9)

Those are your top 10 teams in terms of World Series appearances. The Yankees have won the most with 27, St. Louis is 2nd with 11 and the A's 3rd with 9. Hope this helps!