Jefferson County Flag

Jefferson County

State:
Missouri
County Seat:
Hillsboro

Jefferson County's estimated 2025 population is 235,250 with a growth rate of 0.86% in the past year according to the most recent United States census data. Jefferson County is the 7th largest county in Missouri. The 2010 population was 219,130 and has seen a growth of 7.36% since that time.

235,250
Total Population
359
Population Density (mi²)
7
Population Rank (State)
2K 0.86%
Annual Population Growth

Jefferson County Population

Demographics

Economics and Income Statistics