Total Population in Jefferson County, CO
ACS 2024 5-Year Estimates
579,377
Rank #119/3,222 · #4 in CO
96th
Jefferson 579,377
CO 5,862,189 -90.1%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Jefferson County's total population of 579,377 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Jefferson County for total population.
Nearby Rankings
Full ranking →| #116 | Douglas County, NE | 590,736 |
| #117 | Bristol County, MA | 582,270 |
| #118 | Volusia County, FL | 579,622 |
| #119 | Jefferson County, CO | 579,377 |
| #120 | Union County, NJ | 579,290 |
| #121 | Delaware County, PA | 579,222 |
| #122 | New Castle County, DE | 577,961 |
About Total Population
Jefferson County, Colorado has a total population of 579,377, ranking #119 of 3,222 counties nationwide — 99.8% below the national value of 330M. Within Colorado, it ranks #4 of 64. This places it in the 96th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.