It wasn't only Detroit that got a revised estimate for 2009. Chicago and Cleveland also got their estimates revised up, quite substantially, between 2008 and 2009. The 2008 estimates for those two cities were actually extremely accurate according to the 2010 census, while the 2009 estimate was wildly overstated. On the other hand, even Detroit's 2008 estimate was significantly overstated, since it was off by nearly 100,000 from the actual 2010 population.
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