It's shocking to compare my county which shows up as a hard to click speck on that map with some in the mid west.<p><pre><code> Sioux County (Fort Yates), N.D.Population (2010): 4,153
Population (2005): 4,084
Inbound income per cap. (2009): $8,800
Outbound income per cap. (2009): $13,400
Non-migrant income per cap. (2009): $11,000
Edit: Area: 1,094 sq mi, Density 3/sq mile
Arlington County (Arlington), Va.Population (2010): 207,627
Population (2005): 187,760
Inbound income per cap. (2009): $44,900
Outbound income per cap. (2009): $49,500
Non-migrant income per cap. (2009): $59,000
Edit: Area: 26 sq mi, Density 7,995/sq mi
</code></pre>
PS: Of that 26 sq mi the federal government owns 4.6 square miles (11.9 km2) much of which is Arlington Cemetery which means population density on private land is close to 10,000/sq mile.
Nice. It would be very interesting to correlate the migration with unemployment. The outliers (eg: bad economy but migration influx) would be even more interesting.<p>By the way, I did something similar for scientific collaboration between Metropolitan Statistical Areas: <a href="http://olihb.com/?p=140" rel="nofollow">http://olihb.com/?p=140</a>
This is cool, but only slightly useful. The problem is that for major metropolitan areas(like Harris County) you may see an almost equal income and outgoing, but if you look at the map you see that almost all of the outgoing was to the 6 surrounding counties.
The lines on this map provide almost no additional information at all, and make it almost completely unusable for counties with high turnover (e.g., San Diego).<p>...At least they can be turned off, but why bother?