• county
  • FIPS 08005
  • Largest town: Aurora

Arapahoe County, Colorado

Arapahoe County had 666,918 residents in the Census Vintage 2024 estimate, on 797.9 square miles of land. It ranks 3rd of 64 in Colorado by population and 48th by land area.

Population
666,918
#3 of 64 in Colorado · #105 in US
Area
797.9 sq mi
#48 of 64 in Colorado · #1,071 in US
Density
836 / sq mi
#3 of 64 in Colorado · #187 in US
Median household income
$97,560
#11 of 64 in Colorado · #156 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Arapahoe County within Colorado. Pin: Denver.

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Arapahoe County population, land area and income

Arapahoe County had 666,918 residents in the Census Vintage 2024 estimate, on 797.9 square miles of land. It ranks 3rd of 64 in Colorado by population and 48th by land area. That works out to 835.9 people per square mile, 8.7 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Colorado has 15,336 residents, so Arapahoe County is 43.5 times that size.

Its SAIPE 2023 median household income of $97,560 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

666,918

3144th1st

105th of 3,144 (US)

Land area

798 sq mi

3144th1st

1071st of 3,144 (US)

Density

835.9 / sq mi

3144th1st

187th of 3,144 (US)

Median household income

$97,560

3143rd1st

156th of 3,143 (US)

Rank within Colorado (64)

Population

666,918

64th1st

3rd of 64 (CO)

Land area

798 sq mi

64th1st

48th of 64 (CO)

Density

835.9 / sq mi

64th1st

3rd of 64 (CO)

Median household income

$97,560

64th1st

11th of 64 (CO)

How Arapahoe County's population changed since 2020

Arapahoe County gained 11,606 residents between the July 2020 and July 2024 estimates, a rise of 1.8%. That ranks 32nd of 64 in Colorado for growth. The median Colorado county changed by +1.7%, and the state as a whole by +2.9%.

Since the April 2020 estimates base, Arapahoe County recorded 32,354 births and 20,577 deaths, a natural change of +11,777. Net international migration added +21,424 and net domestic migration, people moving to or from other US counties, came to -21,836. The largest single component was domestic migration, which removed 21,836 people.

655.3k2020657.0k2021658.2k2022661.9k2023666.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
32,354
Deaths
20,577
Net international migration
+21,424
Net domestic migration
-21,836
Change, July 2023 to July 2024
+5,054

Where Arapahoe County is

The Census internal point of Arapahoe County is at 39.644600, -104.331700. It sits in UTM zone 13N. The map shades Colorado's 64 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Arapahoe County outlined. Dots are towns of 1,000+ people with residents in it.

Otero County: -3.6%Lake County: -0.6%Adams County: +4.3%Kit Carson County: +0.2%Phillips County: -0.9%Bent County: +5.5%Lincoln County: -1.1%Washington County: -0.9%Hinsdale County: -5.1%Alamosa County: +1.9%Kiowa County: -4.1%Arapahoe County: +1.8%Archuleta County: +5.1%Montrose County: +4.6%Jefferson County: -0.8%Gilpin County: +2.5%Larimer County: +4.1%Custer County: +17.5%Saguache County: +4.3%Mineral County: +7.1%Broomfield County: +5.1%Logan County: -2.1%Mesa County: +3.4%Eagle County: -2.4%Denver County: +1.6%Pitkin County: -4.2%Boulder County: -0.2%El Paso County: +2.6%Las Animas County: +0.1%San Miguel County: -2.9%Douglas County: +9.3%Cheyenne County: -1.9%Garfield County: +2.2%Ouray County: +6.5%San Juan County: +16.0%Yuma County: +0.8%Elbert County: +12.1%Prowers County: -0.5%Morgan County: +4.2%Delta County: +3.7%Chaffee County: +6.6%Huerfano County: +2.4%Teller County: +0.5%Costilla County: +5.3%Baca County: -3.3%Routt County: +1.6%Conejos County: +1.3%Summit County: -1.1%Clear Creek County: -3.0%Fremont County: +2.5%Rio Blanco County: +1.3%Dolores County: +5.8%Grand County: +2.6%Gunnison County: +2.1%Park County: +5.1%Sedgwick County: -5.5%Montezuma County: +3.7%La Plata County: +2.1%Moffat County: -1.0%Rio Grande County: -3.6%Weld County: +11.5%Pueblo County: +0.9%Jackson County: -7.6%Crowley County: -1.5%
Change 2020 to 2024
  1. < -1.9%
  2. < +0.5%
  3. < +2.4%
  4. < +5.1%
  5. ≥ +5.1%
no data

Orange pin: Arapahoe County internal point. Dark pin: Denver.

Internal point

Decimal
39.644600, -104.331700
DMS
39°38'40.56"N 104°19'54.12"W
UTM
13N 557340.8E 4388525.9N
Geohash
9xjc9c5fx
Plus code
85FQJMV9+R8

Towns in Arapahoe County

11 incorporated places of 1,000+ people have residents in Arapahoe County, 563,223 people together, or 84% of the county. Each figure counts only the part of the town inside Arapahoe County; towns marked "part" extend into another county. The largest is Aurora with 341,313.

  1. 01Aurora (part)341,313
  2. 02Centennial108,853
  3. 03Littleton (part)42,044
  4. 04Englewood35,238
  5. 05Greenwood Village15,288
  6. 06Cherry Hills Village6,349
  7. 07Sheridan5,932
  8. 08Glendale4,465
  9. 09Columbine Valley1,683
  10. 10Deer Trail1,624
  11. 11Bennett (part)434
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Arapahoe County

The Census 2024 county adjacency file lists 7 neighbors for Arapahoe County. The most populous is Denver County, CO, with 729,019 residents. Distances run between Census internal points in a straight line.

Distance to Denver and the nearest big city

Denver is 35.3 miles W of Arapahoe County's internal point in a straight line. The nearest place of 100,000 or more is Aurora, CO (population 403,130), 21.1 miles away.

Arapahoe County FIPS code

The FIPS code of Arapahoe County is 08005: state code 08 for Colorado plus county code 005. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $97,560.

Questions people ask

What is the population of Arapahoe County, Colorado?

The Census Vintage 2024 estimate for July 1, 2024 is 666,918. That is up 11,606 people (1.8%) from the July 2020 estimate of 655,312.

What is the FIPS code of Arapahoe County?

08005. The first two digits (08) are Colorado; the last three (005) identify the county.

What is the largest town in Arapahoe County?

Aurora, with 341,313 residents inside Arapahoe County in 2024 (403,130 across all 3 counties it spans).

Which counties border Arapahoe County?

7 county-equivalents border it in the Census 2024 adjacency file: Denver County, CO; Jefferson County, CO; Adams County, CO; Douglas County, CO; Elbert County, CO; Lincoln County, CO; Washington County, CO.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.