How many people live in DuPage County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 937,100 people living in DuPage County, IL. That makes DuPage County the second-most populous county in Illinois. It is home to 7.4% of people living in the state.
937K
population of DuPage County, IL (2024)
7.4%
County share of the Illinois population (2024)
About 937,100 people lived in DuPage County, IL in 2024.
Population estimates, 2000–2024
What are DuPage County, IL’s age demographics?
About 172,200 DuPage County, IL residents are aged 65 and older in 2024. That represents 18.4% of its population. For comparison, the age group represents 17.9% of Illinois’ population and 18% in the US overall.
Another 203,100 DuPage County residents, or 21.7% 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 DuPage County, IL's population is aged 45–64 than the US as a whole.
Population estimates by age group, (2024)
What are DuPage County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 61.9% of the DuPage County, IL population, higher than the national share of 57.5%. DuPage County, IL also has a larger share of people identifying as non-Hispanic Asian (14.2%) than the US overall (6.5%).
In contrast, DuPage County’s non-Hispanic Black or African American population accounts for 5.2%, below the 12.6% nationwide, and the Hispanic population makes up 16.7% 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.
DuPage County, IL has a higher share of a non-Hispanic Asian population than Illinois as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in DuPage County, IL is Wheaton with about 53,700 residents in 2024.
Cities and towns in DuPage County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Wheaton (pt.) | 53,731 |
| 2. | Naperville (pt.) | 52,447 |
| 3. | Aurora (pt.) | 50,503 |
| 4. | Naperville (pt.) | 48,291 |
| 5. | Lombard (pt.) | 42,481 |
| 6. | Downers Grove (pt.) | 40,236 |
| 7. | Elmhurst (pt.) | 34,795 |
| 8. | Addison (pt.) | 30,827 |
| 9. | Glendale Heights (pt.) | 29,169 |
| 10. | Glen Ellyn (pt.) | 28,230 |
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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.
