How many people live in Iroquois County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 26,100 people living in Iroquois County, IL. That makes Iroquois County the 51st-most populous county in Illinois. It is home to 0.2% of people living in the state.
26.1K
population of Iroquois County, IL (2024)
0.2%
County share of the Illinois population (2024)
About 26,100 people lived in Iroquois County, IL in 2024.
Population estimates, 2000–2024
What are Iroquois County, IL’s age demographics?
About 6,100 Iroquois County residents are aged 65 and older in 2024. That represents 23.4% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 5,600 Iroquois County residents, or 21.3% 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 higher share of Iroquois County, IL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Iroquois County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 87.4% of the Iroquois County, IL population, higher than the national share of 57.5%.
In contrast, Iroquois County’s non-Hispanic Black or African American population accounts for 1.4%, below the 12.6% nationwide, and the Hispanic population makes up 8.9% of the county, compared with 20% 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.
Iroquois 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 Iroquois County, IL is Watseka with about 3,100 residents in 2024.
Cities and towns in Iroquois County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Watseka (pt.) | 3,096 |
| 2. | Gilman | 1,674 |
| 3. | Watseka (pt.) | 1,399 |
| 4. | Clifton | 1,295 |
| 5. | Onarga | 1,294 |
| 6. | Milford | 1,111 |
| 7. | Sheldon | 930 |
| 8. | Cissna Park | 778 |
| 9. | Ashkum | 716 |
| 10. | Ash Grove | 633 |
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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.
