Aurora (, ) is a home rule city located in Arapahoe, Adams, and Douglas counties, Colorado, United States. The city's population was 386,261 at the 2020 United States census with 336,035 residing in Arapahoe County, 47,720 residing in Adams County, and 2,506 residing in Douglas County. Aurora is the third-most-populous city in the State of Colorado and the 51st-most-populous city in the United States. Aurora is a principal city of the Denver–Aurora–Lakewood Metropolitan Statistical Area and a major city of the Front Range Urban Corridor.
Country: United States
State: Colorado
Elevation: 5,404 ft (1,647 m)
Area codes: Both 303 and 720
Counties: Arapahoe, Adams, and Douglas
Platted: 1891 as Fletcher, Colorado
Incorporated (town): May 5, 1903, as the Town of Fletcher
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