Arapahoe County, Colorado Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 3rd-largest in Colorado
The population of Arapahoe County, Colorado is 655,709 as of the 2023 American Community Survey, making it the 3rd-largest county in Colorado. The median household income is $97,215, the median home value is $526,000, and the median age is 37.3.
The population of Arapahoe County has grown 16.0% since 2010 (575,124 → 666,918), a +1.06% annualized rate.
655,709
Population
+1.06%
Annual growth
822
People / sq mi
$97,215
Median Income
$526,000
Median Home Value
Arapahoe County covers 798 sq mi of land at 821.8 people per square mile.
About Arapahoe County, CO
Housing cost is the defining feature of Arapahoe County: the median home is valued at $526,000. With 655,709 residents, Arapahoe County is a county in Colorado. It is the #3-largest of all counties in Colorado nationally.
Households here are among the highest-earning of all US counties: median income is $97,215, above the US median of $78,538. The poverty rate, 5.7%, is on the lower side for US counties and below the national 12.4%. Housing is expensive: the median home is worth $526,000, with typical rent around $1,812.
Arapahoe County is among the best-educated US counties: 45.7% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Working from home is common here: 18.6% of workers do so, above the national 14.0%, and the average commute runs about 27 minutes each way.
High housing values reframe the income picture in Arapahoe County — even solid earnings stretch less against home prices and rents at this level.
Arapahoe County Population History (2010-2024)
The county of Arapahoe County had a population of 575,124 in 2010 and 666,918 in 2024, a 16.0% growth over 14 years. The peak was 666,918 in 2024. Average annual growth rate: 1.07%.
666,918
Population (2024)
575,124
Population (2010)
666,918
Peak (2024)
1.07%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 575,124 |
| 2011 | 586,433 |
| 2012 | 597,052 |
| 2013 | 609,089 |
| 2014 | 619,681 |
| 2015 | 631,688 |
| 2016 | 639,605 |
| 2017 | 645,080 |
| 2018 | 652,395 |
| 2019 | 656,051 |
| 2020 | 655,312 |
| 2021 | 656,952 |
| 2022 | 658,176 |
| 2023 | 661,864 |
| 2024 | 666,918 |
Race & Ethnicity
| White | 61.9% |
| Black or African American | 10.8% |
| Asian | 0.1% |
| Hispanic or Latino (any race) | 2.7% |
| Two or More Races | 0.0% |
Age & Sex
37.3
Median Age
50.1%
Female
49.9%
Male
14.1%
Age 65+
Age Distribution
Children (under 15): 18.8% · Seniors (65+): 14.1%
Income & Poverty
| Median household income | $97,215+$4,745 vs state |
| Mean household income | $132,105 |
| Per-capita income | $51,942 |
| Poverty rate | 5.7%-0.2% vs state |
| Unemployment rate | 3.3% |
| Employment-to-population | 67.8% |
Top Industries by Employment
The largest employment sector in Arapahoe County is professional & business services, accounting for 21.7% of workers.
How residents commute
2.8%
Drive alone
1.5%
Carpool
67.6%
Public transit
18.6%
Work from home
27.3 min
Avg commute
Housing
$526,000+$23,800 vs state
Median home value
$1,812
Median rent
65.1%
Homeownership rate
265,980
Total housing units
95.5%
Occupied
4.5%
Vacant
34.9%
Renter-occupied
Social & access
91.0%
With health insurance
97.6%
With broadband internet
42.7%
Foreign-born
7.0%
Veterans (18+)
10.8%
With a disability
76.7%
Speak language other than English at home
Education
92.0%
High School+
45.7%
Bachelor's+
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Other counties in Colorado
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Metro areas in Colorado
County rankings
Common questions about Arapahoe County, CO
Frequently Asked Questions
Arapahoe County, Colorado has a population of 655,709 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 3rd-largest county in Colorado. Population density is 822 people per square mile.
The population of Arapahoe County has grown 16.0% since 2010 (575,124 → 666,918), a +1.06% annualized rate.
The median household income in Arapahoe County, Colorado is $97,215, with mean (average) household income of $132,105 and per-capita income of $51,942. 5.7% of residents live below the federal poverty level.
In Arapahoe County, the largest racial and ethnic groups are White (61.9%), Black or African American (10.8%), Hispanic or Latino (2.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Arapahoe County, Colorado is 37.3 years. Residents are 50.1% female and 49.9% male.
The median home value in Arapahoe County is $526,000 and median monthly rent is $1,812. 65.1% of occupied housing units are owner-occupied. The county has 265,980 total housing units, 4.5% of which are vacant.
The largest employment sector in Arapahoe County, Colorado is professional, scientific, and management services, employing 21.7% of workers. The unemployment rate is 3.3%.
Denver is among the largest cities associated with Arapahoe County, Colorado, with a population of 713,734.
Arapahoe County, CO Climate
Arapahoe County, CO has an average annual temperature of 9.3°C (49°F) and receives about 382 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
9.3°C
Avg Temp
382
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -2° / 28° | 10 mm |
| February | 0° / 32° | 9 mm |
| March | 4° / 38° | 24 mm |
| April | 8° / 46° | 35 mm |
| May | 13° / 56° | 66 mm |
| June | 19° / 66° | 53 mm |
| July | 22° / 72° | 57 mm |
| August | 21° / 70° | 48 mm |
| September | 17° / 62° | 33 mm |
| October | 10° / 50° | 20 mm |
| November | 3° / 37° | 17 mm |
| December | -2° / 29° | 10 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Arapahoe County, CO
The most comfortable months to visit Arapahoe County, CO are typically August, July and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -10°C low). May is usually the wettest month.
Where to stay near Arapahoe County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.