If the U.S. migration maps I linked to earlier this month weren’t detailed enough for you, you should absolutely take a look at Forbes’s interactive map, which gives county-by-county information on domestic migration. Actually, it’s more detailed than that: for each county, it shows how many people moved to and from each and every other county in the U.S. (assuming that more than 10 people moved from one county to another) and the average per capita income of the people doing the moving. Based on IRS data, which you might expect. The map dates from last June but I can’t recall seeing it before. Thanks to Jason Hodge for the tip; also via @geospatialnews.