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Aurora (/ ə ˈ r oʊ r ə /, / ə ˈ r ɔː r ə /) is a home rule municipality located in Arapahoe, Adams, and Douglas counties, Colorado, United States. [1] 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. [6]
Arapahoe County (/ ə ˈ r æ p ə h oʊ / ə-RAP-ə-hoh) is a county located in the U.S. state of Colorado. As of the 2020 census, its population was 655,070, [1] making it the third-most populous county in Colorado. The county seat is Littleton, [3] and the most populous city is Aurora.
Douglas County is part of the Denver–Aurora–Lakewood metropolitan statistical area. It is located midway between Colorado's two largest cities, Denver and Colorado Springs, and contains a portion of Aurora, the state's third-largest city. Douglas County has the highest median household income of any Colorado county or statistical equivalent ...
Guadaloupe County was the first Colorado county to be renamed after only six days in 1861. 8. Las Animas County was the first new Colorado county to be created (in 1866) after the original 17 counties. 9. Greenwood County was the longest lived former Colorado county, existing four years from 1870 to 1874. 10.
As of 2023, the most populous of these statistical areas is the Denver-Aurora-Greeley, CO CSA, ... Denver County, Colorado: 716,577 Arapahoe County, Colorado: 656,061
The Town of Keystone, incorporated on February 8, 2024, is the newest Colorado municipality. Colorado municipalities range in population from the City and County of Denver with a 2020 population of 715,522, to the Town of Carbonate, which has had no year-round population since the 1890 Census due to its severe winter weather and difficult access.
The county population as of April 1, 2010, as enumerated by the 2010 United States Census, [6] The percent population change from April 1, 2010, to April 1, 2020. The Denver–Aurora–Lakewood, CO Metropolitan Statistical Area
Custer County, Colorado: 1886 1928 Silverton [cr] San Juan County, Colorado Territory San Juan County, Colorado: January 31, 1876 present Springfield [q] Baca County, Colorado: April 16, 1889 present Steamboat Springs [co] Routt County, Colorado: 1912 present Sterling [bu] Logan County, Colorado: February 25, 1887 present Tarryall City Tarryall [i]