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State of California Open Data

County/DAU Population Trends Annual Data

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Published by:
California Department of Water Resources
Last updated:
April 28, 2025
File details:
N/A
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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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