Arapahoe County , Colorado

Arapahoe County: County in Colorado, United States

Arapahoe County locator map
Location of Arapahoe County on Colorado map.


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 9 years in 2019 county had an estimated population of 656,590 inhabitants. Its county seat is Littleton. The county was created 159 years ago in 1861.


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.

LittletonMunicipalCourthouse image

The largest city of Arapahoe County is Centennial with a population of 110,937. Other cities include, Littleton population 48,065, Englewood population 34,917, Castlewood population 25,271 and Greenwood Village population 15,735. See all Arapahoe County cities & populated places.

LittletonMunicipalCourthouse image

Arapahoe County map

Arapahoe County Quick Facts

Population : 656,590 (2019)
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 : 01:20:45 (3rd August 2021)
Density : 315 Pop. per km² as of 2019
Population growth : 12.88% (2010-2019)

Arapahoe County has 7 neighbours.


The population of Arapahoe County increased by 12.88% in 9 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

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People born in Arapahoe County (1)

American child actress (1907-1990) Baby Lillian Wade was born in Arapahoe County

Arapahoe County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Arapahoe County.

City Name Population Title
Centennial 110,937 City in Colorado, United States of America
Littleton 48,065 City in Arapahoe County, Colorado, United States
Southglenn 42,268 Neighborhood in Centennial, Colorado, United States
Englewood 34,917 City in Bergen County, New Jersey, United States
Castlewood 25,271 City in Hamlin County, South Dakota, United States
Greenwood Village 15,735 City in Colorado
Cherry Hills Village 6,647 City in Colorado, United States
Sheridan 6,183 City in State of Colorado, United States
Dove Valley 5,243
Glendale 5,141 City in Colorado
Columbine Valley 1,499 City in Arapahoe County, Colorado, United States of America
Byers 1,160 City in Arapahoe County, Colorado, United States
Bow Mar 942 Town of the United States
Deer Trail 800 City in Arapahoe County, Colorado, United States of America
Foxfield 782 City in Arapahoe County, Colorado, United States of America

Colorado Other Counties (more counties)

County Name Population Title
Colorado 5,758,736 State of the United States of America
Denver 727,211 Capital city of the state of Colorado, United States; consolidated city and county
Denver County 727,211 County in Colorado, United States, coterminous with the City of Denver
El Paso County 720,403 One of the 64 counties in the U.
Jefferson County 582,881 County in Colorado, United States
Adams County 517,421 County in Colorado, United States
Colorado Springs 478,221 County seat of El Paso County, Colorado, United States
Aurora 379,289 City in Kane County, Illinois, United States
Larimer County 356,899 County in Colorado, United States
Douglas County 351,154 County in Colorado, United States
Boulder County 326,196 County in Colorado, United States
Weld County 324,492 County in Colorado, United States
Fort Collins 170,243 Municipality and county seat of Larimer County, Colorado, United States
Pueblo County 168,424 County in Colorado, United States
Lakewood 157,935 City in Colorado
Mesa County 154,210 County in Colorado, United States

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