Jefferson County, Colorado Demographics 2026
Jefferson County, Colorado has a population of 579,377, the 4th most populous county in Colorado. The median household income is $110,656 and the median home value is $637,600. The poverty rate is 6.7%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Jefferson County Quick Facts
How Jefferson County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 579,715 | 579,377 | -0.1% |
| Median household income | $107,800 | $110,656 | +2.6% |
| Median home value | $604,400 | $637,600 | +5.5% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 52 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Jefferson County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Lakewood | 156,583 | $89,792 | 9.2% | $574,400 |
| Arvada | 122,634 | $117,348 | 5.8% | $632,600 |
| Westminster | 115,484 | $100,272 | 7.3% | $532,400 |
| Dakota Ridge | 33,753 | $120,822 | 4.4% | $604,600 |
| Ken Caryl | 33,233 | $118,269 | 3.7% | $600,300 |
| Wheat Ridge | 32,070 | $90,564 | 11.2% | $623,000 |
| Golden | 20,417 | $98,582 | 12.6% | $837,700 |
| Superior | 13,305 | $159,434 | 3.2% | $903,900 |
| Fairmount | 9,902 | $163,600 | 2.9% | $827,600 |
| Evergreen | 8,602 | $150,417 | 3.3% | $829,400 |
| Applewood | 8,350 | $130,545 | 4.4% | $785,900 |
| West Pleasant View | 5,051 | $95,817 | 11.7% | $489,400 |
| Edgewater | 4,932 | $76,591 | 15.3% | $636,900 |
| Genesee | 3,778 | $186,667 | 2.4% | $1,032,700 |
| Coal Creek | 2,346 | $134,250 | 5.4% | $625,800 |
| Indian Hills | 986 | $178,980 | 6.8% | $789,200 |
| East Pleasant View | 832 | $106,920 | 10.0% | $485,700 |
| Kittredge | 812 | $222,500 | 3.8% | $744,000 |
| Aspen Park | 742 | $104,167 | 0.0% | $693,100 |
| Mountain View | 609 | $106,875 | 11.7% | $596,800 |
| Morrison | 412 | $122,083 | 2.6% | $875,000 |
| Brook Forest | 355 | $116,528 | 9.3% | $693,300 |
| Idledale | 297 | N/A | 0.0% | $451,900 |
| Lakeside | 4 | N/A | 50.0% | N/A |
Explore Colorado Rankings
Population Overview
Jefferson County is located in Colorado with a total population of 579,377. It is the 4th most populous county out of 64 in Colorado. The county encompasses 24 Census-designated places.
Age Demographics
The median age in Jefferson County is 40.5 years. This is 7% higher than the state median of 37.7 years.
Economy, Income & Housing
The median household income in Jefferson County is $110,656. This is 16% higher than the state median of $95,470. It is also 37% higher than the national median of $80,734. The poverty rate stands at 6.7%. This is 29% lower than the state poverty rate of 9.4%. The unemployment rate is 3.9%. This is 15% lower than the state rate of 4.6%. The median home value is $637,600. Housing costs are 18% higher than the state median of $539,400. The home-value-to-income ratio is 5.8x. 70.7% of occupied housing units are owner-occupied. This homeownership rate is 7% higher than the state average of 66.2%.
Race & Ethnicity
The largest racial or ethnic group in Jefferson County is White (non-Hispanic), making up 75.2% of the population. Hispanic or Latino residents account for 16.1%. The Black or African American population (1.1%) is well below the state average of 3.8%.
Education
52.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 14% higher than the state rate of 45.7%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.8%. Notably, 19.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All figures for Jefferson County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Colorado and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Jefferson County, Colorado?
Jefferson County has a population of 579,377, making it the 4th most populous county in Colorado.
What is the median income in Jefferson County?
The median household income in Jefferson County is $110,656 with a poverty rate of 6.7%.
How many cities are in Jefferson County, Colorado?
Jefferson County contains 24 Census-designated places.