The Oakland Athletics (often referred to as the A's) are an American professional baseball team based in Oakland, California. The Athletics compete in Major League Baseball (MLB) as a member club of the American League (AL) West division. The team plays its home games at the Oakland Coliseum. Throughout their history, the Athletics have won nine World Series championships. From 1901 to 2021, the Athletics' overall win–loss record is 9,150–9,552 (.489).