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.
Sangamon County, IL Climate
Sangamon County, IL has an average annual temperature of 11.9°C (53°F) and receives about 931 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.9°C
Avg Temp
931
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -4° / 26° | 42 mm |
| February | -1° / 31° | 45 mm |
| March | 6° / 42° | 81 mm |
| April | 12° / 54° | 92 mm |
| May | 18° / 64° | 106 mm |
| June | 23° / 74° | 98 mm |
| July | 25° / 78° | 92 mm |
| August | 24° / 75° | 88 mm |
| September | 20° / 68° | 80 mm |
| October | 13° / 56° | 67 mm |
| November | 6° / 43° | 74 mm |
| December | 0° / 31° | 66 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Sangamon County, IL
The most comfortable months to visit Sangamon County, IL are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -8°C low). May is usually the wettest month.
Where to stay near Sangamon County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.