Putnam County Flag

Putnam County

State:
Illinois
County Seat:
Hennepin

Putnam County's estimated 2026 population is 5,723 with a growth rate of 0.79% in the past year according to the most recent United States census data. Putnam County is the 94th largest county in Illinois. The 2010 population was 6,014 and has seen a growth of -4.84% since that time.

5,723
Total Population
36
Population Density (mi²)
94
Population Rank (State)
45 0.79%
Annual Population Growth

Putnam County Population

Demographics

Economics and Income Statistics