Jefferson County, Colorado Age & Gender Distribution (2024)
Population distribution by age and gender for Jefferson County, Colorado
Jefferson County, Colorado Age & Gender Statistics (2024)
Total Population
579,377
Median Age
40.5
Male Median
39.4
Female Median
41.6
Jefferson County, Colorado Population Growth
Jefferson County, Colorado Demographic Trend
Since 2010, the population of has changed by +9.6%%.
+9.6%% Growth
Jefferson County, Colorado Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Jefferson County, Colorado Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 40.5 | 579,377 |
| 2023 | 40.4 | 579,715 |
| 2022 | 40.2 | 580,519 |
| 2021 | 40.2 | 580,130 |
| 2020 | 40.2 | 578,795 |
| 2019 | 40.3 | 574,798 |
| 2018 | 40.4 | 570,427 |
| 2017 | 40.4 | 564,029 |
| 2016 | 40.5 | 558,810 |
| 2015 | 40.4 | 552,344 |
| 2014 | 40.4 | 546,162 |
| 2013 | 40.4 | 540,669 |
| 2012 | 40.2 | 536,095 |
| 2011 | 40.0 | 532,243 |
| 2010 | 39.7 | 528,614 |
Jefferson County, Colorado Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 4.7% |
| 5–17 | 13.8% |
| 18–24 | 7.4% |
| 25–34 | 15.4% |
| 35–54 | 27.6% |
| 55–64 | 13.2% |
| 65+ | 17.9% |
Dependency Ratios for Jefferson County, Colorado
- Total Dependency Ratio:
- 57.1
- Youth Dependency:
- 29.0
- Old-Age Dependency:
- 28.1
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Jefferson County, Colorado
The median age in Jefferson County, Colorado is 40.5 years.
According to latest Census data, the total population of Jefferson County, Colorado is 579,377.
In Jefferson County, Colorado, seniors (ages 65+) make up 17.9% of the population, while children under 18 represent 13.8%.
Based on historical data since 2010, the population in Jefferson County, Colorado has remained stable.