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data californiaCalifornia is a state in United States. The population in California was 39,431,263 in 2025. The median age in California was 37.6 in 2025. The median income in California was $41,901 inPesticide Data Index Application. DPR's library of pesticide data includes more than 81,900 volumes of data containing more than 222,000 studies. The index is updated each Sunday.