Arapahoe County, Colorado
Arapahoe County: County in Colorado, United States
About
Arapahoe County is a county located in the U.S. state of Colorado. As of the 2010 census, the population was 572,003 and a population density of 274 people per km². After 10 years in 2020 county had an estimated population of 657,452 inhabitants. Its county seat is Littleton. The county was created 163 years ago in 1861.
Quick Facts about Arapahoe County
| Population : | 657,452 (2020) |
| Country : | United States of America |
| State : | Colorado (United States) |
| Twitter username : | arapahoecounty |
| Area : | 2086 km2 |
| Water as percent of area : | 0.9% |
| Land as percent of area : | 99.1% |
| Named for : | Arapahoe County |
| Altitude : | 5,656 feet / 1724 meters |
| Capital : | Littleton |
| Establishment : | November 11, 1861 |
| Time Zone : | UTC−07:00 |
| Local time : | 01:25:40 (22nd February 2025) |
| Density : | 315 Pop. per km² as of 2020 |
| Population growth : | 13% (2010-2020) |
Geography
Arapahoe County is located at 39°38'59"N 104°20'21"W (39.6497700, -104.3392400). It has 7 neighbors: Elbert County, Adams County, Denver County, Douglas County, Jefferson County, Lincoln County and Washington County.
Arapahoe County map
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The largest city of Arapahoe County is Centennial with a population of 110,156. Other cities include, Littleton population 46,000, Englewood population 35,099, Castlewood population 25,271 and Greenwood Village population 14,907. See all Arapahoe County cities & populated places.
Arapahoe County Populated Places
Cities, towns, neighborhoods & other populated places in Arapahoe County.
| City Name | Population | Title |
|---|---|---|
| Centennial | 110,156 | The second most populous city in Arapahoe County, Colorado. |
| Littleton | 46,000 | A city in Arapahoe County, Colorado. |
| Southglenn | 42,268 | Neighborhood in Centennial, Colorado, United States |
| Englewood | 35,099 | City in Bergen County, New Jersey, United States |
| Castlewood | 25,271 | City in Hamlin County, South Dakota, United States |
| Greenwood Village | 14,907 | City in Colorado |
| Cherry Hills Village | 6,620 | City in Colorado, United States |
| Sheridan | 6,027 | City in State of Colorado, United States |
| Glendale | 5,102 | City in Colorado |
| Columbine Valley | 1,508 | City in Arapahoe County, Colorado, United States of America |
| Byers | 1,160 | City in Arapahoe County, Colorado, United States |
| Bow Mar | 947 | Town of the United States |
| Deer Trail | 856 | City in Arapahoe County, Colorado, United States of America |
| Foxfield | 771 | City in Arapahoe County, Colorado, United States of America |
- Official Website
Official website of Arapahoe County
Arapahoe County has 7 neighbours.
- Elbert County county in Colorado, United States
- Adams County county in Colorado, United States
- Denver County county in Colorado, United States, coterminous with the City of Denver
- Douglas County county in Colorado, United States
- Jefferson County county in Colorado, United States
- Lincoln County county in Colorado, United States
- Washington County county in Colorado, United States
Demographics
The population of Arapahoe County increased by 13% in 10 years.
| Year | Population | % Change | Method |
| 2010 | 572,003 | - | census |
| 2011 | 585,968 | 2.38% | estimation process |
| 2012 | 596,500 | 1.77% | estimation process |
| 2013 | 608,467 | 1.97% | estimation process |
| 2014 | 619,034 | 1.71% | estimation process |
| 2015 | 630,984 | 1.89% | estimation process |
| 2016 | 638,950 | 1.25% | estimation process |
| 2017 | 644,478 | 0.86% | estimation process |
| 2018 | 651,797 | 1.12% | estimation process |
| 2019 | 656,590 | 0.73% | estimation process |
| 2020 | 657,452 | 0.13% | estimation process |
People born in Arapahoe County (1)
American child actress (1907-1990) Baby Lillian Wade was born in Arapahoe County
Colorado Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Denver | 735,538 | The twentieth most populous city in the United States and the center of the Denver metropolitan area. |
| Denver County | 735,538 | County in Colorado, United States, coterminous with the City of Denver |
| El Paso County | 728,310 | One of the 64 counties in the U. |
| Jefferson County | 583,283 | County in Colorado, United States |
| Adams County | 519,883 | County in Colorado, United States |
| Colorado Springs | 482,131 | The second most populous city in Colorado and the center of the Colorado Springs metropolitan area. |
| Aurora | 387,377 | The third most populous city in Colorado and the center of the Denver metropolitan area. |
| Douglas County | 360,750 | County in Colorado, United States |
| Larimer County | 360,428 | County in Colorado, United States |
| Weld County | 333,983 | County in Colorado, United States |
| Boulder County | 327,171 | County in Colorado, United States |
| Pueblo County | 169,823 | County in Colorado, United States |
| Fort Collins | 168,234 | The fifth most populous city in Colorado. |
| Lakewood | 157,429 | The fifth most populous city in Colorado. |
| Mesa County | 155,603 | County in Colorado, United States |
| Thornton | 148,113 | The seventh most populous city in Colorado. |
