Boone County Flag

Boone County

State:
Illinois
County Seat:
Belvidere

Boone County's estimated 2026 population is 53,461 with a growth rate of 0.14% in the past year according to the most recent United States census data. Boone County is the 27th largest county in Illinois. The 2010 population was 54,094 and has seen a growth of -1.17% since that time.

53,461
Total Population
190
Population Density (mi²)
27
Population Rank (State)
74 0.14%
Annual Population Growth

Boone County Population

Demographics

Economics and Income Statistics