There were at least three class D California State Leagues in operation at some point in minor league baseball history. Two lasted just a single season (1910 and 1929) and the other lasted three seasons 1913 through 1915.

The 1910 version was actually class B until June 6, when it became class D. Sacramento and San Francisco dropped out May 31, and Oakland moved to Merced on June 7, which might explain the drop in classification. Then Fresno disbanded June 24, causing the league to cease operations the same day.

The league made it through the 1913 season then disbanded June 1, 1914. When it was re-tried in 1915, the league disbanded May 30, due to heavy rains, with the teams having played only 5 to 7 games.

The 1929 version, which was based in Southern California unlike the previous two versions, lasted until June 17, with teams having played about 50 games.

• Alameda, CA: Alameda 1915
• Bakersfield, CA: Bakersfield Bees 1929
• Berkeley, CA: Berkeley 1915
• Coronado, CA: Coronado Arabs 1929
• Fresno, CA: Fresno Tigers 1910; Fresno Packers 1913; Fresno Tigers 1914
• Merced, CA: Merced Fig Growers 1910
• Modesto, CA: Modesto Reds 1914–1915
• Oakland, CA: Oakland Invaders 1910; Oakland Commuters 1915
• Pomona, CA: Pomona Arabs 1929
• Sacramento, CA: Sacramento Baby Senators 1910
• San Francisco, CA: San Francisco Baby Seals 1910; San Francisco 1915
• San Diego, CA: San Diego Aces 1929
• San Jose, CA: San Jose Prune Pickers 1910; San Jose Bears 1913–1915
• Santa Ana, CA: Santa Ana Orange Countians 1929
• Stockton, CA: Stockton Millers 1910; Stockton Producers 1913; Stockton Millers 1914–1915
• Vallejo, CA: Vallejo Marines 1913
• Watsonville, CA: Watsonville Pippins 1913

The Encyclopedia of Minor League Baseball: Second Edition.