The California League of Minor League Baseball is one of three Class A-Advanced baseball leagues in the United States. The league was founded in 1941, but ceased operations from 1942 to 1945 during World War II. The circuit reorganized in 1946, and has been in continual operation since. A league champion is determined at the end of each season. Champions have been determined by post-season playoffs or being declared champion by the league office. Currently, the first-half winner in each division (North and South) receives a bye into the second round, or division series. Each division's second-half winner and wild card team, the team with the best winning percentage over the entire season to have not won either half of the season, face each other in a best-of-three series. The winner of this mini-series meets the division's first-half winner in a best-of-five series to determine division champions. Then, the North and South division winners play a best-of-five series to determine a league champion.
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League champions
Score and finalist information is only presented when post-season play occurred. The lack of this information indicates a declared league champion.California League titles by organization
Active organizations appear in bold. Defunct teams or teams now playing in others leagues appear in italics.