Population
580,451
2025
−0.5% since 2020
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. Resident population, July 1 estimate.
Jefferson County, CO: population growth, jobs and income
Jefferson County gained 92 residents between 2024 and 2025 (+0.0%).
Jefferson County had an estimated 580,451 residents in 2025, down 0.5% (2,680 fewer people) since 2020. That is slower than Colorado as a whole (+3.9%), and the 41st fastest growth of 61 counties in Colorado.
Data as of 2025 · updated
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In the Jefferson County report
One-time $99 PDF: everything on this page for Jefferson County, ranked against Colorado and the U.S., plus these figures that are not on the free page:
- Median gross rent$1,861/mo2020–24
- Vacant homes, incl. seasonal and second homes4.7%2020–24
- New homes permitted, last 12 months1,0232025-10/2026-09
- Rent growth, 5 yearsIn the report
- Permits in 5+ unit buildingsIn the report
- IRS income moving in (net AGI)In the report
- Neighbouring-county comparison tableIn the report
What's inside: 5 pages
- 1 Summary, headline numbers and ranks (free preview)
- 2 Ranks and the neighbouring-county table
- 3 Migration, with IRS mover and income flows
- 4 Rent, vacant homes, permits and employers
- 5 Every source and the methods
Headline numbers
Net domestic migration
−1,904
2025
−3.3 per 1,000 residents
−12,277 in total, 2021–2025
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025), 2025. People moving in from other U.S. counties minus people moving out.
Unemployment rate
3.8%
2025
+1.3 pts since 2019
Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics, 2025. Annual average unemployment rate.
New homes permitted
1,118
2025
−55.5% since 2021
1.9 per 1,000 residents
Source: U.S. Census Bureau, Building Permits Survey, 2025. Housing units authorized by building permits in the year.
Median household income
$110,656
2020–24
+26.0% since 2016–20
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–24. American Community Survey 5-year estimate.
Private-sector employment
210,701
2023
+4.4% since 2018
Source: U.S. Census Bureau, County Business Patterns, 2023. Paid employees of private employers in mid-March (County Business Patterns).
What the numbers say
Net domestic migration was negative in 2025: 1,904 more people moved out to other U.S. counties than moved in.
Private employers had 210,701 paid employees in mid-March 2023, +4.4% since 2018 (County Business Patterns).
Unemployment averaged 3.8% in 2025, 1.3 points higher than in 2019 (before the pandemic).
Builders were authorized to start 1,118 new homes in 2025, or 1.9 per 1,000 residents.
Median household income was $110,656 in the 2020–24 American Community Survey, +26.0% since 2016–20.
Across the 3,107 U.S. counties with a comparable estimate, its population growth ranks 2,037th.
Part of the Denver-Aurora-Centennial, CO metro area.
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Jefferson County population by year
| Year | Population | Change |
|---|---|---|
| 2025 | 580,451 | +92 |
| 2024 | 580,359 | +2,275 |
| 2023 | 578,084 | +1,381 |
| 2022 | 576,703 | −4,299 |
| 2021 | 581,002 | −2,129 |
| 2020 | 583,131 | – |
Census Bureau population estimates, July 1 of each year.
What drove the change in Jefferson County
Jefferson County lost 2,680 people since 2020; the biggest drag was domestic migration (−12,277).
| Component | 2025 | 2020–25 | Share |
|---|---|---|---|
| Natural changebirths minus deaths | +795 | +1,884 | |
| International migrationfrom and to other countries | +1,156 | +7,646 | |
| Domestic migrationfrom and to other U.S. counties | −1,904 | −12,277 | |
| Census adjustmentbalancing residual | +45 | +67 | |
| Total change | +92 | −2,680 |
Census Bureau population estimates, components of change, each year July 1 to June 30. The components add up to the change in the estimate; the Census adjustment is the small balancing figure the Bureau publishes.
How it ranks
| Measure | In Colorado | Among U.S. counties |
|---|---|---|
| Population growth | 41st of 61 | 2,037th of 3,107 |
| Net domestic migration per 1,000 residents | 40th of 61 | 2,377th of 3,108 |
| Private-sector job growth | 36th of 61 | 1,291st of 3,092 |
| Median household income | 4th of 61 | 93rd of 3,107 |
| Lowest unemployment rate | 28th of 61 | 1,250th of 3,108 |
| New homes permitted per 1,000 residents | 42nd of 61 | 1,574th of 3,005 |
1st = highest (lowest for unemployment). Counties are ranked only against others with a figure for the same period.
Get the county report — $99
The County Growth and Demographics Report for Jefferson County, CO as a PDF, from federal data: population and migration, housing and rents, permits, private employers and jobs, unemployment, ranks in the state and the country, and neighbouring counties, with a source next to every number. Pay once, no subscription.
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Neighbouring counties
Over 2020–25, Jefferson County's population change (−0.5%) was ahead of 2 of its 10 neighbouring counties and behind 8.
2 of its 10 neighbouring counties had a higher median household income than Jefferson County's $110,656 (2020–24).
| County | Population2025 | Population change2020–25 | Net domestic migration per 1,000 residents2025 | Homes permitted per 1,000 residents2025 | Median household income2020–24 |
|---|---|---|---|---|---|
| Jefferson County, CO This county | 580,451 | −0.5% | −3.3 | 1.9 | $110,656 |
| Douglas County, CO | 399,396 | +10.8% | 8.3 | 6.0 | $149,594 |
| Denver County, CO | 740,613 | +3.2% | −10.8 | 6.4 | $94,718 |
| Gilpin County, CO | 6,073 | +4.4% | 16.6 | 3.6 | $95,361 |
| Clear Creek County, CO | 8,994 | −3.9% | −1.7 | 2.3 | $94,577 |
| Broomfield County, CO | 79,174 | +6.3% | 3.6 | 12.3 | $123,874 |
| Boulder County, CO | 328,560 | −0.7% | −6.8 | 6.1 | $103,994 |
| Teller County, CO | 24,756 | +0.0% | 1.3 | 4.8 | $85,361 |
| Park County, CO | 18,314 | +5.1% | −3.4 | 8.3 | $103,670 |
| Arapahoe County, CO | 673,820 | +2.8% | −14.6 | 5.3 | $101,087 |
| Adams County, CO | 554,668 | +6.6% | 0.7 | 4.7 | $94,571 |
Census Bureau population estimates and building permits, American Community Survey 5-year income. Rates per 1,000 residents. – means no figure, or a base too small for a change or rate (it would swing on a few people). A figure from another period shows its year and is left out of the comparison.
Questions
Is Jefferson County growing?
No. Its population fell 0.5% between 2020 and 2025, about 2,680 fewer people (Census Bureau population estimates). Colorado as a whole changed +3.9% over the same years. That ranks 41st of 61 counties in Colorado for population growth.
How many people moved to Jefferson County?
On net, none in 2025: about 1,904 more people moved out to other U.S. counties than moved in (Census Bureau net domestic migration estimate).
What is the unemployment rate in Jefferson County?
It averaged 3.8% in 2025 (BLS Local Area Unemployment Statistics, annual average).
What is the population of Jefferson County?
About 580,451 people, according to the U.S. Census Bureau's population estimate for July 1, 2025.
How many jobs are in Jefferson County?
Private employers there had 210,701 paid employees in mid-March 2023, +4.4% since 2018 (Census Bureau County Business Patterns; government jobs and the self-employed are not counted).
What Beacon CRE covers in Colorado
Map, parcel and listing layers cover North and South Carolina only for now. This page and the other Colorado county pages carry the public federal growth figures.
Jefferson County data alerts
Email me when Jefferson County gets new Census numbers: population, building permits, jobs and income. About 4 emails a year, one click to stop.
Sources and method
- U.S. Census Bureau, Population Estimates Program (Vintage 2025)
- U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics
- U.S. Census Bureau, Building Permits Survey
- U.S. Census Bureau, American Community Survey 5-year estimates
- U.S. Census Bureau, County Business Patterns
Each number shows its own period. Changes compare the latest period with five years earlier (or the earliest period available). Beacon CRE last refreshed these figures on 2026-11-05. Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how we compute every number. More on every layer: data sources and licences.
Jobs outside North and South Carolina use County Business Patterns (paid private-sector employees in mid-March); wages and government jobs are not included.