The flight from flood-prone real estate accelerated sharply in 2025. High-risk U.S. counties lost 63,357 more residents than they gained, nearly double the net outflow of 34,099 in 2024, according to a new analysis from Redfin, the real estate brokerage powered by Rocket.
The findings draw on U.S. Census Bureau domestic migration data and climate-risk scores from First Street, tracking counties where between 23.7% and 99.1% of homes carry elevated flood risk.
Miami and Houston lead the outflows
Miami-Dade County posted the largest net outflow of any high-flood-risk county in the analysis, shedding 72,254 more residents than it gained, the largest such figure on record for the county.
Harris County, Texas, which includes Houston, ranked second with a net outflow of 43,377. Four of the 10 hardest-hit counties are in Florida, including Pinellas, Collier, and Monroe, in addition to Miami-Dade…