Most population lost, US counties
US counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. Los Angeles County, California leads at -319,075. 3,135 counties qualify in total. California carries 7 of the top 25 entries.
Flip the list · Most population gained, US counties →UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES
Frequently asked
Which county has the lowest population change?
Los Angeles County, California ranks #1 with -319,075 (2025 Census Population Estimates).
What are the top 5 counties by population change?
Los Angeles County, California, Kings County, New York, Cook County, Illinois, Bronx County, New York, San Francisco County, California.
How many counties are in this ranking?
3,135 counties qualify after filtering for population minimums and data availability. The ranking covers 2025 Census population estimates.
How is population change measured?
Change in the number of residents from the prior decennial census (raw count, not a percentage). Source: US Census Bureau, Population Estimates Program (2025).