How many people live in Hamilton County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 7,800 people living in Hamilton County, IL. That makes Hamilton County the 89th-most populous county in Illinois. It is home to 0.06% of people living in the state.
7.82K
population of Hamilton County, IL (2024)
0.06%
County share of the Illinois population (2024)
About 7,800 people lived in Hamilton County, IL in 2024.
Population estimates, 2000–2024
What are Hamilton County, IL’s age demographics?
About 1,800 Hamilton County residents are aged 65 and older in 2024. That represents 23.5% of its population. For comparison, the age group represents 17.9% of Illinois’ population and 18% in the US overall.
Another 1,700 Hamilton County residents, or 21.4% of the population, were children under 18. For comparison, the age group represents 21.2% of Illinois’s population and 21.6% in the US overall.
A higher share of Hamilton County, IL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Hamilton County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 95.3% of the Hamilton County, IL population, higher than the national share of 57.5%.
In contrast, Hamilton County’s Hispanic population accounts for 1.7%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 0.68% of the county, compared with 12.6% 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.
Hamilton 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 Hamilton County, IL is McLeansboro with about 2,600 residents in 2024.
Cities and towns in Hamilton County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | McLeansboro | 2,593 |
| 2. | Dahlgren | 493 |
| 3. | Twigg | 486 |
| 4. | Flannigan | 307 |
| 5. | Crook | 284 |
| 6. | Beaver Creek | 249 |
| 7. | South Crouch | 193 |
| 8. | Broughton | 179 |
| 9. | South Flannigan | 138 |
| 10. | South Twigg | 118 |
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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.
