Arapahoe County , Colorado

Arapahoe County: County in Colorado, United States


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 160 years ago in 1861.

Arapahoe County Quick Facts

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 : 03:34:45 (2nd October 2022)
Density : 315 Pop. per km² as of 2020
Population growth : 13% (2010-2020)
Arapahoe County locator map
Location of Arapahoe County on Colorado map.
LittletonMunicipalCourthouse image
LittletonMunicipalCourthouse image


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

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 City in Colorado, United States of America
Littleton 46,000 City in Arapahoe County, Colorado, United States
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

Arapahoe County has 7 neighbours.


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

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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 Capital city of the state of Colorado, United States; consolidated city and county
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 County seat of El Paso County, Colorado, United States
Aurora 387,377 City in Kane County, Illinois, United States
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 Municipality and county seat of Larimer County, Colorado, United States
Lakewood 157,429 City in Colorado
Mesa County 155,603 County in Colorado, United States
Thornton 148,113 City in Adams County, Colorado, United States of America