Despite the "new urbanism," Census data released today show people leaving cities and suburbs for further-flung exurbs, a trend that's especially apparent locally. Analysis by USA Today ranks Cook County as the decade's biggest loser: its population has decreased by 70,000 since 2000, the most significant drop in the US. Where are the people going? Surely it's not a coincidence that Kendall County, 50 miles outside Chicago, saw the nation's third largest increase.