Los Angeles County saw the largest decline of any county in the United States in 2025, according to new census data published on March 26.
Nearly 54,000 people moved out of L.A. County between July 1, 2024 and July 1, 2025, U.S. Census data shows. The decline is part of an ongoing trend. In 2020 L.A. County was estimated to have more than 10 million residents. As of 2025, the county was thought to have just under 9.7 million residents.
It’s unclear where the fleeing Angelinos are moving. However, the neighboring counties of Riverside and San Bernardino saw a combined increase of 21,131 residents between 2024 and 2025, according to U.S. Census data. The greater Las Vegas area also saw a population boost of more than 21,000 people last year.