How many people live in Ogle County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 51,300 people living in Ogle County, IL. That makes Ogle County the 28th-most populous county in Illinois. It is home to 0.4% of people living in the state.
51.3K
population of Ogle County, IL (2024)
0.4%
County share of the Illinois population (2024)
About 51,300 people lived in Ogle County, IL in 2024.
Population estimates, 2000–2024
What are Ogle County, IL’s age demographics?
About 10,700 Ogle County residents are aged 65 and older in 2024. That represents 20.9% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 11,200 Ogle 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 lower share of Ogle County, IL's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Ogle County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 83.8% of the Ogle County, IL population, higher than the national share of 57.5%.
In contrast, Ogle County’s non-Hispanic Black or African American population accounts for 1.3%, below the 12.6% nationwide, and the Hispanic population makes up 12.8% 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.
Ogle 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 Ogle County, IL is Rochelle with about 9,400 residents in 2024.
Cities and towns in Ogle County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Rochelle (pt.) | 9,413 |
| 2. | Byron (pt.) | 3,698 |
| 3. | Oregon | 3,570 |
| 4. | Mount Morris | 2,792 |
| 5. | Davis Junction | 2,534 |
| 6. | Polo | 2,238 |
| 7. | Forreston (pt.) | 1,400 |
| 8. | Hillcrest (pt.) | 1,195 |
| 9. | Stillman Valley (pt.) | 1,047 |
| 10. | Pine Rock | 934 |
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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.
