Jefferson County, Colorado Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Jefferson County, CO Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
-
A
Health Above averageHealthier than 87% of counties in Colorado
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B
Income Around averageWealthier than 90% of counties in Colorado
-
A
Education Above averageBetter educated than 77% of counties in Colorado
Source: Map AI Methodology
Population: density and quick facts
| Metric | Jefferson County | Colorado Avg | U.S. Average |
|---|---|---|---|
| Population | 579,346 | 5,842,429 | 337,468,954 |
| Population density (per sq mi) | 749.0 | 56.1 | 86.4 |
| Population growth (%/yr) | 0.43% | 1.09% | 0.59% |
| Median age | 40.8 | 35.2 | 37.3 |
| Households | 241,730 | 2,364,171 | 130,235,071 |
Population in Jefferson County grew by 10.0% from 2009 to 2024, reaching 579,346 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Jefferson County is Millennials, aged 29–44, at 24.3% of residents. That is about the same share as Colorado.
- Gen Z 13–28 112,671 19.4% -3.1 pts
- Millennials 29–44 140,592 24.3% on par
- Gen X 45–60 124,667 21.5% +1.7 pts
- Boomers 61–79 102,685 17.7% +2.5 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Colorado, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 50.1% of the people living in Jefferson County and men 49.9%.
- Women 50.1% Colorado 49.4%
- Men 49.9% Colorado 50.6%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Jefferson County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Jefferson County has a the economy index of B, which means it is quite prosperous.
| Metric | Jefferson County | Colorado Avg | U.S. Average |
|---|---|---|---|
| Median household income | $110,559 | $95,803 | $80,455 |
| Income growth (%/yr) | 5.52% | 5.41% | 4.80% |
| Unemployment rate | 3.9% | 4.6% | 5.2% |
The median household income in Jefferson County is about 15% higher than in Colorado.
Housing
| Metric | Jefferson County | Colorado Avg | U.S. Average |
|---|---|---|---|
| Median home price | $591,210 | $484,034 | $248,835 |
| Median rent | $1,861 | $1,761 | $1,407 |
| Homeownership rate | 70.7% | 66.2% | 65.2% |
The median home price in Jefferson County is about 26.5 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,861 per month for that long.
Commute Time & Mobility
Commuters in Jefferson County spend about 47 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 195 hours, about 8.1 full days, spent commuting.
| Metric | Jefferson County | Colorado Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 23.4 | 22.0 | 22.4 |
| Round-trip commute (min) | 46.8 | 44.1 | 44.8 |
| Yearly time spent (hours) | 195 | 184 | 187 |
| Estimated yearly cost | $6,045 | $5,694 | $5,790 |
| Work from home | 25.4% | 21.0% | 15.0% |
| Highway traffic (vehicles/day) | 14,700 | 8,183 | 8,813 |
| Local road traffic (vehicles/day) | 2,965 | 1,277 | 1,355 |
Fastest commutes among counties in
Colorado:
Hinsdale County (6.6 min), Prowers County (7.6 min), Cheyenne County (7.7 min).
Slowest:
Park County (42.5 min), Elbert County (41.5 min), Teller County (31.3 min).
The average commute time in Jefferson County is 23 minutes, longer than the 22 minutes in Colorado.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Jefferson County has a education index of A, which means it is very educated.
| Metric | Jefferson County | Colorado Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 46.0% | 40.3% | 31.6% |
| Average household size | 2.36 | 2.42 | 2.53 |
Highest education index among counties in
Colorado:
Boulder County (0.5), Douglas County (0.4), Broomfield County (0.4).
Lowest:
Crowley County (0.2), Bent County (0.2), Lincoln County (0.2).
Health
Jefferson County has a health index of A, which means it is very healthy.
| Metric | Jefferson County | Colorado Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 79.9 | 80.0 | 78.3 |
| Self-rated poor health | 10.0% | 13.2% | 16.3% |
| Smokers | 12.5% | 16.1% | 19.0% |
Highest health index among counties in
Colorado:
Douglas County (0.9), Boulder County (0.8), Broomfield County (0.8).
Lowest:
Costilla County (0.8), Otero County (0.8), Bent County (0.8).
Jefferson County, CO Compared With Nearby Counties
Jefferson County, CO is the 2nd largest of the 4 counties compared here, 579,346 residents against a local median of 377,140. Jefferson County, CO sits close to the middle of its own neighbourhood. No measure below is more than 15% off the local median, so the choice between these counties turns on things this data does not capture.
The largest of those small differences is median home price, 14% below the local median at $591,210 against $685,833. Jefferson County, CO has the 4th highest median home price of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Jefferson County, CO | 579,346 | $110,559 #3/4 | $591,210 #4/4 | 23.4 min #3/4 |
| Douglas County, CO | 377,140 | $149,583 | $701,148 | 23.6 min |
| Denver County, CO | 718,150 | $94,979 | $618,408 | 22.9 min |
| Broomfield County, CO | 76,305 | $123,906 | $685,833 | 22.9 min |
Frequently Asked Questions
Common questions about Jefferson County, Colorado.
How many people live in Jefferson County, Colorado?
About 579,346 people live in Jefferson County, Colorado, in 241,730 households of 2.4 people on average. The median age is 40.8, so residents are older than the U.S. median of 37.3 by about 3 years.
How densely populated is Jefferson County, Colorado?
Averaged over its land area, Jefferson County, Colorado has 749 people per square mile, a density typical of a mix of suburbs, small towns and farmland. That is about 8.7 times the U.S. average of 86.
How affordable is housing in Jefferson County, Colorado?
The median home costs 5.3 times the median household income ($591,210 against $110,559), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $1,861 a month takes about 20% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How strong is the job market in Jefferson County, Colorado?
Unemployment in Jefferson County, Colorado is only 3.9%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
How educated are people in Jefferson County, Colorado?
46.0% of adults in Jefferson County, Colorado hold a bachelor's degree or higher (about 1 in 2), well above the U.S. share of 31.6%.
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