AMERICAN LEAGUE LEADERS, 2004
| Batting—Ichiro Suzuki, Seattle | .372 |
| Home runs—Manny Ramirez, Boston | 43 |
| Runs batted in—Miguel Tejada, Baltimore | 150 |
| Runs—Vladimir Guerrero, Anaheim | 124 |
| Hits—Ichiro Suzuki, Seattle | 262 |
| Stolen bases—Carl Crawford, Tampa Bay | 59 |
| Doubles—Brian Roberts, Baltimore | 50 |
| Triples—Carl Crawford, Tampa Bay | 19 |
| Slugging percentage—Manny Ramirez, Boston | .613 |
A.L. Pitching
| Wins—Curt Schilling, Boston | 21 |
| Earned run average—Johan Santana, Minnesota | 2.61 |
| Strikeouts—Johan Santana, Minnesota | 265 |
| Innings pitched—Mark Buehrle, Chicago | 245.1 |
| Complete games—Mark Mulder, Oakland; Sidney Ponson, Baltimore; Jake Westbrook, Cleveland | 5 |
| Shutouts—Jeremy Bonderman, Detroit; Tim Hudson, Oakland; Sidney Ponson, Baltimore | 2 |
| Saves—Mariano Rivera, New York | 53 |