Aurora is a Home Rule Municipality in the U.S. state of Colorado, spanning Arapahoe and Adams counties, with the extreme southeastern portion of the city extending into Douglas County. Aurora is one of the principal cities of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area (Metro Denver). The city's population was 325,078 in the 2010 census, which made it the third most populous city in the state of Colorado and the 54th most populous city in the United States. The Denver-Aurora-Lakewood, CO Metropolitan Statistical Area had an estimated population of 2,645,209 on July 1, 2012 (the 19th most populous MSA in the U.S.). However, Denver and Aurora combined make up less than half of the Denver Metro Area's population and Aurora has approximately half the population of Denver. The estimated population of the Denver-Aurora, CO Combined Statistical Area was 3,214,218 on July 1, 2012 (15th most populous CSA).
Aurora is located adjacent to the east side of Denver. The city's official elevation, posted on signs at the city limits, is 5,471 feet (1,668 m). However, the city spans a difference in elevation of nearly 1,000 feet (300 m). The lowest elevation of 5,285 feet (1,611 m) is found at the point where Sand Creek crosses the city limit in the northwest corner of the city, while the highest elevation of 6,229 feet (1,899 m) is on the extreme southern border of the city in Douglas County, near the intersection of Inspiration and Gartrell roads.
As of the 2010 census, there were 325,078 people, 121,191 households, and 73,036 families residing in the city. The population density was 1,939.6 inhabitants per square mile (748.9/km²). There were 131,040 housing units at an average density of 766.7 per square mile (296.0/km²).
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