This chart was published in the Forbes magazine by Jon Bruner, and the data comes from the IRS tax stats tables.
Chart:

American Migration [Interactive Map] Close to 40 million Americans move from one home to another every year. Click anywhere on the map below: blue counties send more migrants to the selected county than they take; red counties take more than they send.
View interactive chart on Forbes website
Other aricles by Jon Bruner:
Comment
Comment by Vincent Granville on May 8, 2012 at 7:12am By the way, here's another great chart from the same guy:

Comment by Vincent Granville on May 8, 2012 at 7:07am Also, how do you produce a chart like this one? Can you do it with R, SAS, or in Perl?
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