How many people live in McDonough County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 26,700 people living in McDonough County, IL. That makes McDonough County the 50th-most populous county in Illinois. It is home to 0.21% of people living in the state.
26.7K
population of McDonough County, IL (2024)
0.21%
County share of the Illinois population (2024)
About 26,700 people lived in McDonough County, IL in 2024.
Population estimates, 2000–2024
What are McDonough County, IL’s age demographics?
About 5,300 McDonough County residents are aged 65 and older in 2024. That represents 19.7% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 4,900 McDonough County residents, or 18.5% 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 McDonough County, IL's population is aged 18–24 than the US as a whole.
Population estimates by age group, (2024)
What are McDonough County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 85.6% of the McDonough County, IL population, higher than the national share of 57.5%.
In contrast, McDonough County’s Hispanic population accounts for 3.6%, below the 20% nationwide, and the non-Hispanic Black or African American population makes up 5.9% 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.
McDonough 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 McDonough County, IL is Macomb with about 14,800 residents in 2024.
Cities and towns in McDonough County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Macomb | 14,765 |
| 2. | Bushnell | 2,649 |
| 3. | Emmet | 1,224 |
| 4. | Colchester | 1,082 |
| 5. | Chalmers | 696 |
| 6. | Blandinsville (pt.) | 523 |
| 7. | Scotland | 401 |
| 8. | Prairie City | 399 |
| 9. | Industry | 387 |
| 10. | New Salem | 337 |
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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.
