Original: Denver and Aurora are the principal cities of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area, which in 2007 had an estimated population of 2,464,866.
Simplified: Denver and Aurora are the main cities of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area, a United States metropolitan area (MSA). In 2007, the cities within the statistical area had about 2,464,866 people, which makes it the MSA with the 22nd most people.