How many people live in Sangamon County, IL?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 194,300 people living in Sangamon County, IL. That makes Sangamon County the 11th-most populous county in Illinois. It is home to 1.5% of people living in the state.
194K
population of Sangamon County, IL (2024)
1.5%
County share of the Illinois population (2024)
About 194,300 people lived in Sangamon County, IL in 2024.
Population estimates, 2000–2024
What are Sangamon County, IL’s age demographics?
About 39,700 Sangamon County, IL residents are aged 65 and older in 2024. That represents 20.4% of its population. For comparison, the age group represents 17.9% of Illinois' population and 18% in the US overall.
Another 41,600 Sangamon County residents, or 21.4% 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 Sangamon County, IL's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Sangamon County, IL’s racial and ethnic demographics?
Non-Hispanic white residents make up 77% of the Sangamon County, IL population, higher than the national share of 57.5%. Sangamon County, IL also has a larger share of people identifying as non-Hispanic Black or African American (14.1%) than the US overall (12.6%).
In contrast, Sangamon County’s Hispanic population accounts for 3.2%, below the 20% nationwide, and the non-Hispanic Asian population makes up 2.6% 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.
Sangamon 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 Sangamon County, IL is Springfield with about 111,100 residents in 2024.
Cities and towns in Sangamon County, IL ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Springfield (pt.) | 111,129 |
| 2. | Chatham (pt.) | 8,134 |
| 3. | Chatham (pt.) | 6,341 |
| 4. | Auburn | 4,453 |
| 5. | Rochester | 4,044 |
| 6. | Sherman (pt.) | 3,938 |
| 7. | Riverton | 3,489 |
| 8. | Pawnee | 2,698 |
| 9. | Jerome | 1,646 |
| 10. | Southern View | 1,551 |
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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.
