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
Arapahoe County is a county in Colorado with a population of 655,709. It ranks #3 among counties in Colorado by population. The median age is 37.3, younger than the national median. The population is 49.9% male and 50.1% female.
The median household income in Arapahoe County is $97,215, above the US median of $74,580. 5.7% of residents live below the federal poverty level. Home values sit at a median of $526,000, with monthly rent averaging $1,812. The homeownership rate of 65.1% is close to the national rate of 64.8%.
Educational attainment in Arapahoe County reflects 45.7% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 18.6% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 27.3 minutes each way.
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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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.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.