Aurora, CO

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Aurora is a city of 276,000 in the Denver Area of Colorado. As of 2010 it was the 56th largest city in America. In 2008 it was named the "All American City." Aurora and Denver are the principal cities of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area, which in 2007 had an estimated population of around 2½ million people. It is split between three different counties, spanning Arapahoe, Adams, and Douglas.