| Name | Jefferson County |
| State | Colorado |
| FIPS Code | 08059 |
| County Seat | Golden |
| Timezone | Mountain Daylight Time (MDT) |
| Population (2024) | 577,693 |
| Population Growth Rate(2020-2024) | -0.91% |
| Majority Ethnicity | White 79.86% |
| Public School Majority Ethnicity | White 64% |
| Partisan Voting Index | Democratic:+8 |
| Unemployment Rate (May 2026) | 4.1% |
| Sales Tax Rate (2025) | 4.5% |
| Area Code(s) | 303 / 720 / 983 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 79.86% |
| African American | 1.11% |
| Hispanic | 15.49% |
| Asian | 2.77% |
| Native American | 0.7% |
| Hawaiin/Pacific Islander | 0.07% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 63.81% |
| African American | 1.86% |
| Hispanic | 26.7% |
| Asian | 2.94% |
| Native American | 0.51% |
| Hawaiin/Pacific Islander | 0.16% |