Sangamon County, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 11th-largest in Illinois
The population of Sangamon County, Illinois is 195,217 as of the 2023 American Community Survey, making it the 11th-largest county in Illinois. The median household income is $74,114, the median home value is $170,300, and the median age is 40.8.
The population of Sangamon County has declined 1.7% since 2010 (197,769 → 194,345), a -0.12% annualized rate.
195,217
Population
-0.12%
Annual growth
225
People / sq mi
$74,114
Median Income
$170,300
Median Home Value
Sangamon County covers 868 sq mi of land at 224.8 people per square mile.
About Sangamon County, IL
Sangamon County is defined demographically by education — 35.1% of adults hold a bachelor’s degree, near the national average. With 195,217 residents, Sangamon County is a county in Illinois. It ranks #11 among counties in Illinois by population.
The typical household earns $74,114 a year, below the US median of $78,538. The poverty rate is 8.3%, below the national 12.4%. The typical home is valued at $170,300, with typical rent around $954.
About 35.1% of adults 25 and older have a bachelor’s degree, near the 35.0% national figure. Remote work is on the higher side at 12.0%, below the national 14.0%, and the average commute runs about 20 minutes each way.
The education numbers are the throughline: a college-heavy population in Sangamon County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Sangamon County Population History (2010-2024)
The county of Sangamon County had a population of 197,769 in 2010 and 194,345 in 2024, a -1.7% growth over 14 years. The peak was 199,431 in 2012. Average annual growth rate: -0.12%.
194,345
Population (2024)
197,769
Population (2010)
199,431
Peak (2012)
-0.12%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 197,769 |
| 2011 | 199,052 |
| 2012 | 199,431 |
| 2013 | 199,190 |
| 2014 | 199,252 |
| 2015 | 198,973 |
| 2016 | 198,085 |
| 2017 | 197,163 |
| 2018 | 195,802 |
| 2019 | 194,882 |
| 2020 | 196,223 |
| 2021 | 195,468 |
| 2022 | 194,483 |
| 2023 | 194,216 |
| 2024 | 194,345 |
Race & Ethnicity
| White | 79.1% |
| Black or African American | 12.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.7% |
| Two or More Races | 0.0% |
Age & Sex
40.8
Median Age
51.7%
Female
48.3%
Male
18.9%
Age 65+
Age Distribution
Children (under 15): 18.0% · Seniors (65+): 18.9%
Income & Poverty
| Median household income | $74,114$-7,588 vs state |
| Mean household income | $97,695 |
| Per-capita income | $42,851 |
| Poverty rate | 8.3%+0.1% vs state |
| Unemployment rate | 3.4% |
| Employment-to-population | 58.1% |
Top Industries by Employment
The largest employment sector in Sangamon County is professional & business services, accounting for 28.2% of workers.
How residents commute
1.1%
Drive alone
1.3%
Carpool
78.3%
Public transit
12.0%
Work from home
19.5 min
Avg commute
Housing
$170,300$-80,200 vs state
Median home value
$954
Median rent
70.6%
Homeownership rate
93,151
Total housing units
90.5%
Occupied
9.5%
Vacant
29.4%
Renter-occupied
Social & access
96.2%
With health insurance
94.1%
With broadband internet
15.3%
Foreign-born
7.0%
Veterans (18+)
13.6%
With a disability
95.4%
Speak language other than English at home
Education
93.7%
High School+
35.1%
Bachelor's+
Largest cities in Illinois
Other counties in Illinois
Part of Illinois
Metro areas in Illinois
County rankings
Frequently Asked Questions
Sangamon County, Illinois has a population of 195,217 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 11th-largest county in Illinois. Population density is 225 people per square mile.
The population of Sangamon County has declined 1.7% since 2010 (197,769 → 194,345), a -0.12% annualized rate.
The median household income in Sangamon County, Illinois is $74,114, with mean (average) household income of $97,695 and per-capita income of $42,851. 8.3% of residents live below the federal poverty level.
In Sangamon County, the largest racial and ethnic groups are White (79.1%), Black or African American (12.7%), Hispanic or Latino (0.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Sangamon County, Illinois is 40.8 years. Residents are 51.7% female and 48.3% male.
The median home value in Sangamon County is $170,300 and median monthly rent is $954. 70.6% of occupied housing units are owner-occupied. The county has 93,151 total housing units, 9.5% of which are vacant.
The largest employment sector in Sangamon County, Illinois is professional, scientific, and management services, employing 28.2% of workers. The unemployment rate is 3.4%.
Chicago is among the largest cities associated with Sangamon County, Illinois, with a population of 2,707,648.
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Statewide data for Illinois
Population, race, income, age, and trends across Illinois
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.