In a given year, about 6 percent of the U.S. population picks up and changes counties. Young families move from Chicago to the surrounding suburbs. Recent college graduates cross the country for a first job in Boston, or Washington, D.C. Retirees relocate for good down to the Sunbelt.
If you could track all of these moves simultaneously across time, you'd get a picture of the parts of the country that are net population gainers, and those that are losing people instead. That picture would look like this:
To read the original article: A Detailed Map of the Net Migration Flows for Every U.S. County - Emily Badger - The Atlantic Cities
