Counties home to LA, Chicago and New York City suffered the largest exodus of people in the country - while tens of thousands flocked to Arizona, Texas and Florida.
San Francisco was another city where an income of more than $300,000 was needed to provide $100,000-worth of purchasing power.
Los Angeles County, which is still the most populous county in the US, saw an average of 143,000 people leave between July 2021 and July 2022, according to the census data.
It was followed by Cook County, home to Chicago, which lost around 94,000 people to other parts of the country. Three of New York City's counties - Kings, Queens and the Bronx - were all among the top five counties facing a mass migration.