Warren County, Illinois Demographics 2026

Population Overview

Warren County is located in Illinois with a total population of 16,576. It is the 65th most populous county out of 102 in Illinois.

Age Demographics

The median age in Warren County is 38.7 years. This is about average than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Warren County is $64,650. This is 21% lower than the state median of $81,702. Compared to the national median of $78,538, household income here is 18% lower. The poverty rate stands at 12.8%. This is 10% higher than the state poverty rate of 11.7%. The unemployment rate is 5.2%. This is 11% lower than the state rate of 5.8%. The median home value is $101,300. Housing costs are 60% lower than the state median of $250,500. With a home-value-to-income ratio of just 1.6x, Warren County is one of the most affordable housing markets in the area. 78.1% of occupied housing units are owner-occupied. This homeownership rate is 17% higher than the state average of 66.8%.

Race & Ethnicity

The largest racial or ethnic group in Warren County is White (non-Hispanic), making up 81.7% of the population. Hispanic or Latino residents account for 10.8%. The Black or African American population (2.8%) is well below the state average of 13.6%. The Asian population (2.4%) is well below the state average of 5.8%.

Education

22.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 41% lower than the state rate of 37.2%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 86.6%.