How many people live in Stephenson County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 43,100 people living in Stephenson County, IL. That makes Stephenson County the 33rd-most populous county in Illinois. It is home to 0.34% of people living in the state.
43.1K
population of Stephenson County, IL (2024)
0.34%
County share of the Illinois population (2024)
About 43,100 people lived in Stephenson County, IL in 2024.
Population estimates, 2000–2024
What are Stephenson County, IL’s age demographics?
About 10,800 Stephenson County, IL residents are aged 65 and older in 2024. That represents 25.1% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 9,000 Stephenson County residents, or 20.8% 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 higher share of Stephenson County, IL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Stephenson County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 79.3% of the Stephenson County, IL population, higher than the national share of 57.5%. Stephenson County, IL also has a larger share of people identifying as non-Hispanic two or more races (3.5%) than the US overall (2.5%).
In contrast, Stephenson County’s Hispanic population accounts for 6.2%, below the 20% nationwide, and the non-Hispanic Asian population makes up 0.96% of the county, compared with 6.5% 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.
Stephenson 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 Stephenson County, IL is Freeport with about 23,100 residents in 2024.
Cities and towns in Stephenson County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Freeport | 23,140 |
| 2. | Lena (pt.) | 2,579 |
| 3. | Rock Grove | 1,453 |
| 4. | Florence | 1,130 |
| 5. | Pearl City | 756 |
| 6. | Orangeville (pt.) | 737 |
| 7. | Waddams | 709 |
| 8. | Silver Creek | 604 |
| 9. | Davis | 568 |
| 10. | Dakota | 479 |
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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.
