County/DAU Population Trends Annual Data
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Published by:
California Department of Water Resources
Last updated:
July 28, 2025
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Description:
The file includes population trends from 1998 to the current year for each of California's 58 counties, further broken down by Detailed Analysis Units (DAUs). DAUs are the smallest geographic units defined by the California Department of Water Resources, based on hydrological boundaries. Each of the 58 counties contains multiple DAUs.
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