In the first half of 2017, more people moved from blue (Democratic) counties to red (Republican) counties than from red to blue counties, according to data on Redfin.com user searches. Counties were classified as “blue” if the Democratic candidate for 2016 won by more than 20 percentage points and vice versa for “red” counties.1
Overall, 7.4 percent more people moved out of blue counties than to them. Compare that with red counties, which saw about 1 percent more people moving in than moving out. Purple counties, where there’s a more balanced share of Democrats and Republicans, saw 3.9 percent more migrants moving in than out.
Just looking at swing states—the most populous being Florida—the trend is even more pronounced. In these states, counties with more Democratic voters lost 9.2 percent more people than they gained while Republican counties gained 2.3 percent more than they lost. Swing counties in swing states saw 1.8 percent more people move in than out.