Much of decrease is due to the sharp decline in Southside Chicago as well as the growth of the suburbs outside of Cook county. http://igpa.uillinois.edu/conten

Much of decrease is due to the sharp decline in Southside Chicago as well as the growth of the suburbs outside of Cook county. http://igpa.uillinois.edu/content/census-reveals-population-change-illinois http://igpa.uillinois.edu/content/census-reveals-population-... Thanks to the economy, however, the trend is somewhat reversed: http://www.chicagobusiness.com/article/20120406/BLOGS02/120409835/chicago-area-population-growth-slows-to-a-crawl http://www.chicagobusiness.com/article/20120406/BLOGS02/1204...