How many people live in Will County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 708,600 people living in Will County, IL. That makes Will County the fourth-most populous county in Illinois. It is home to 5.6% of people living in the state.
709K
population of Will County, IL (2024)
5.6%
County share of the Illinois population (2024)
About 708,600 people lived in Will County, IL in 2024.
Population estimates, 2000–2024
What are Will County, IL’s age demographics?
About 110,500 Will County residents are aged 65 and older in 2024. That represents 15.6% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 161,600 Will County residents, or 22.8% 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 lower share of Will County, IL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Will County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 57.9% of the Will County, IL population, higher than the national share of 57.5%. Will County also has a larger share of people identifying as Hispanic (20.6%) than the US overall (20%).
In contrast, Will County’s non-Hispanic two or more races population accounts for 1.7%, below the 2.5% nationwide, and the non-Hispanic American Indian and Alaska Native population makes up 0.12% of the county, compared with 0.72% 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.
Will County, IL has a higher share of a Hispanic population than Illinois as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Will County, IL is Joliet with about 69,400 residents in 2024.
Cities and towns in Will County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Joliet (pt.) | 69,393 |
| 2. | Bolingbrook (pt.) | 65,243 |
| 3. | Naperville (pt.) | 44,353 |
| 4. | Joliet (pt.) | 38,399 |
| 5. | New Lenox (pt.) | 28,197 |
| 6. | Joliet (pt.) | 25,445 |
| 7. | Homer Glen (pt.) | 24,728 |
| 8. | Plainfield (pt.) | 23,317 |
| 9. | Plainfield (pt.) | 22,193 |
| 10. | Frankfort (pt.) | 21,005 |
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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.
