Clinton County, Illinois Demographics 2026
Clinton County, Illinois has a population of 36,954, the 37th most populous county in Illinois. The median household income is $86,588 and the median home value is $192,400. The poverty rate is 7.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Clinton County Quick Facts
How Clinton County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 36,899 | 36,954 | +0.1% |
| Median household income | $82,314 | $86,588 | +5.2% |
| Median home value | $180,500 | $192,400 | +6.6% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Clinton County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Breese | 4,301 | $85,222 | 4.2% | $229,600 |
| Carlyle | 2,980 | $77,273 | 7.9% | $155,000 |
| Trenton | 2,664 | $80,795 | 12.4% | $178,200 |
| Aviston | 2,387 | $117,875 | 4.1% | $244,800 |
| Germantown | 1,350 | $92,083 | 5.4% | $192,500 |
| Albers | 1,280 | $109,583 | 7.2% | $210,200 |
| Beckemeyer | 993 | $63,603 | 5.4% | $121,300 |
| Bartelso | 782 | $90,000 | 4.2% | $209,700 |
| Keyesport | 635 | $46,500 | 26.2% | $72,500 |
| Hoffman | 607 | $66,667 | 5.6% | $106,700 |
| St. Rose | 593 | $115,000 | 8.1% | $206,000 |
| Damiansville | 570 | $105,000 | 7.9% | $194,100 |
| Huey | 109 | $43,500 | 17.8% | $83,000 |
Explore Illinois Rankings
Population Overview
Clinton County is located in Illinois with a total population of 36,954. It is the 37th most populous county out of 102 in Illinois. The county encompasses 13 Census-designated places.
Age Demographics
The median age in Clinton County is 41.5 years. This is 6% higher than the state median of 39.0 years.
Economy, Income & Housing
The median household income in Clinton County is $86,588. This is 4% higher than the state median of $83,390. It is also 7% higher than the national median of $80,734. The poverty rate stands at 7.4%. This is 38% lower than the state poverty rate of 11.8%. The unemployment rate is 3.4%. This is 41% lower than the state rate of 5.8%. The median home value is $192,400. Housing costs are 27% lower than the state median of $263,300. With a home-value-to-income ratio of just 2.2x, Clinton County is one of the most affordable housing markets in the area. 80.3% of occupied housing units are owner-occupied. This homeownership rate is 20% higher than the state average of 67.1%.
Race & Ethnicity
Clinton County has a predominantly White (non-Hispanic) population, comprising 90.1% of all residents. Hispanic or Latino residents account for 4.1%. The White (non-Hispanic) population is significantly higher than the state average (90.1% vs 58.1%). The Black or African American population (3.1%) is well below the state average of 13.3%. The Hispanic or Latino population (4.1%) is well below the state average of 18.8%. The Asian population (0.6%) is well below the state average of 5.9%.
Education
25.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 32% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.3%.
Data Sources & Methodology
All figures for Clinton County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Illinois and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Clinton County, Illinois?
Clinton County has a population of 36,954, making it the 37th most populous county in Illinois.
What is the median income in Clinton County?
The median household income in Clinton County is $86,588 with a poverty rate of 7.4%.
How many cities are in Clinton County, Illinois?
Clinton County contains 13 Census-designated places.