Jefferson County Flag

Jefferson County

State:
Colorado
County Seat:
Golden

Jefferson County's estimated 2025 population is 577,476 with a growth rate of 0.1% in the past year according to the most recent United States census data. Jefferson County is the 4th largest county in Colorado. The 2010 population was 535,567 and has seen a growth of 7.83% since that time.

577,476
Total Population
756
Population Density (mi²)
4
Population Rank (State)
555 0.1%
Annual Population Growth

Jefferson County Population

Demographics

Economics and Income Statistics