Arapahoe County's 2026 population is estimated at 671,880, reflecting a -0.29% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Arapahoe County is the 3rd largest county in Colorado. The 2010 population was 575,124 and has grown 16.82% since 2010.
Overall: 37.3 years
Female: 38.3 years
Male: 36.4 years
There are 510,782 adults, (95,133 of whom are seniors) in Arapahoe County.
Female: 330,484 (50.1%)
Male: 329,360 (49.9%)
The racial composition of Arapahoe County includes 59.16% White, 10.91% Black or African American, 7.34% other race, 6.08% Asian, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 390,363 | 59.16% |
| Two or more races | 100,228 | 15.19% |
| Black or African American | 71,991 | 10.91% |
| Other race | 48,407 | 7.34% |
| Asian | 40,139 | 6.08% |
| Native American | 6,769 | 1.03% |
| Native Hawaiian or Pacific Islander | 1,947 | 0.3% |
Arapahoe County 's average per capita income is $60,534. Household income levels show a median of $101,087. The poverty rate stands at 8.64%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $144,498 | $183,671 |
| Families | $125,235 | $161,773 |
| Households | $101,087 | $136,289 |
| Non Families | $64,086 | $83,393 |
Average Income
Median Household Income
Poverty Rate
