Aurora, Colorado - AbsoluteAstronomy.com

City of Aurora is a Home Rule Municipality spanning Arapahoe

Arapahoe County, Colorado

As of the census of 2000, there were 487,967 people, 190,909 households, and 125,809 families residing in the county. The population density was 608 people per square mile . There were 196,835 housing units at an average density of 245 per square mile...

, Adams

Adams County, Colorado

Adams County is the fifth most populous of the 64 counties of the state of Colorado of the United States. The United States Census Bureau estimates that the county population was 441,603 in 2010 census, a 21.4% increase since 2000 census. Adams County is named for Alva Adams, Governor of the...

, and Douglas

Douglas County, Colorado

Douglas County is the eighth most populous of the 64 counties of the state of Colorado, in the United States. The county is located midway between Colorado's two largest cities: Denver and Colorado Springs...

counties in Colorado

Colorado

Colorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...

. Aurora is an eastern suburb of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area (Metro Denver). The city is the third most populous city

Colorado municipalities

The U.S. state of Colorado currently has 271 active incorporated municipalities, including 196 towns, 73 cities, and two consolidated city and county governments.-Municipal government:...

in the Colorado and the 56th most populous city in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The city had a population of 325,078 in the 2010 Census.