How many people live in Boone County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 53,300 people living in Boone County, IL. That makes Boone County the 26th-most populous county in Illinois. It is home to 0.42% of people living in the state.
53.3K
population of Boone County, IL (2024)
0.42%
County share of the Illinois population (2024)
About 53,300 people lived in Boone County, IL in 2024.
Population estimates, 2000–2024
What are Boone County, IL’s age demographics?
About 9,500 Boone County, IL residents are aged 65 and older in 2024. That represents 17.9% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 12,200 Boone County residents, or 23% of the population, were children under 18. For comparison, the age group represents 21.2% of Illinois’ population and 21.6% in the US overall.
A lower share of Boone County, IL's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Boone County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 66.9% of the Boone County, IL population, higher than the national share of 57.5%. Boone County, IL also has a larger share of people identifying as Hispanic (27.2%) than the US overall (20%).
In contrast, Boone County’s non-Hispanic Black or African American population accounts for 2.6%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 1.4% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Boone County, IL has a higher share of a non-Hispanic white population than Illinois as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Boone County, IL is Belvidere with about 20,600 residents in 2024.
Cities and towns in Boone County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Belvidere (pt.) | 20,611 |
| 2. | Poplar Grove (pt.) | 3,373 |
| 3. | Belvidere (pt.) | 2,687 |
| 4. | Belvidere (pt.) | 2,027 |
| 5. | Poplar Grove (pt.) | 1,771 |
| 6. | Loves Park (pt.) | 1,455 |
| 7. | Capron | 1,402 |
| 8. | Manchester | 867 |
| 9. | Timberlane (pt.) | 849 |
| 10. | LeRoy | 465 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
