Jefferson County Flag

Jefferson County

State:
Alabama
County Seat:
Birmingham

Jefferson County's estimated 2026 population is 666,064 with a growth rate of 0.1% in the past year according to the most recent United States census data. Jefferson County is the largest county in Alabama. The 2010 population was 658,230 and has seen a growth of 1.19% since that time.

666,064
Total Population
599
Population Density (mi²)
1
Population Rank (State)
660 0.1%
Annual Population Growth

Jefferson County Population

Demographics

Economics and Income Statistics