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Los Angeles County posts biggest drop
Los Angeles County recorded the largest population decline among U.S. counties between July 1, 2024, and July 1, 2025. U.S. Census Bureau estimates show the county lost 53,934 residents. The population dropped to 9,694,934 during that period.
This equals a decline of about 0.5%, making it the sharpest numeric drop nationwide. Los Angeles County still remains the most populous county in the United States. The gap between Los Angeles County and the next largest county remains significant.
The estimates are based on tracked changes in migration, births, and deaths. These figures are updated annually using census data models. The numbers reflect overall population movement trends rather than one single cause.
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Domestic migration drove the decline
Los Angeles County recorded a net domestic migration loss of 105,471 residents between July 1, 2024, and July 1, 2025. More people moved to other parts of the United States than moved into the county, making domestic migration the biggest drag on population change…