In the issue april 2007 of Amber Waves,an interesting on-line magazine from USDA-ERS was publishedan article about
the Dynamics of rural population in USA:
http://www.ers.usda.gov/amber-waves/200 ... areas.aspx
Besides more recently an issue from USDA-ERS, released in August 2009, explain the baby-boomers migration to the countryside
a phenomenon that is taking place in the USA.
You can find more about this issue and its impact on rural America in this web-page of the USDA, ERS:
http://www.ers.usda.gov/amber-waves/200 ... erica.aspx