Jefferson County's estimated 2026 population is 580,213 with a growth rate of 0.14% in the past year according to the most recent United States census data. Jefferson County is the 4th largest county in Colorado. The 2010 population was 535,567 and has seen a growth of 8.34% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 81.96% White, and smaller percentages for other race, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (81.96%)
Two or more races (10.42%)
Other race (2.85%)
Asian (2.84%)
Black or African American (1.13%)
Native American (0.72%)
Native Hawaiian or Pacific Islander (0.07%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 475,142 | 81.96% |
| Two or more races | 60,430 | 10.42% |
| Other race | 16,499 | 2.85% |
| Asian | 16,461 | 2.84% |
| Black or African American | 6,578 | 1.13% |
| Native American | 4,194 | 0.72% |
| Native Hawaiian or Pacific Islander | 411 | 0.07% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $65,291. Household income levels show a median of $107,800. The poverty rate stands at 6.7%.
Name | Median | Mean |
|---|---|---|
| Married Families | $149,868 | $181,380 |
| Families | $133,411 | $164,402 |
| Households | $107,800 | $137,752 |
| Non Families | $66,871 | $87,082 |
Average Income
Median Household Income
Poverty Rate
