Interactive graphic by Christopher Ingraham.
Source: American Community Survey 2012.
I always have a bit of a hard time parsing exactly what's going on within these Circos-style visualizations. Walker's graphic allows you to hover over a given state to highlight only those migrations, which helps quite a bit.
I thought there might be a better way to display these data, but I wasn't right. I stuck with a map, drawing circles for each state sized by net migration (comings minus goings) and colored according to whether the state gained or lost residents overall. To get at individual state flows, click a state - paths radiate inwards and outwards fr