Cass County, Illinois Demographics 2026

Population Overview

Cass County is located in Illinois with a total population of 12,826. It is the 82nd most populous county out of 102 in Illinois.

Age Demographics

The median age in Cass County is 38.1 years. This is 2% lower than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Cass County is $64,907. This is 21% lower than the state median of $81,702. Compared to the national median of $78,538, household income here is 17% lower. The poverty rate stands at 10.9%. This is 7% lower than the state poverty rate of 11.7%. The unemployment rate is 5.0%. This is 15% lower than the state rate of 5.8%. The median home value is $95,500. Housing costs are 62% lower than the state median of $250,500. With a home-value-to-income ratio of just 1.5x, Cass County is one of the most affordable housing markets in the area. 74.9% of occupied housing units are owner-occupied. This homeownership rate is 12% higher than the state average of 66.8%.

Race & Ethnicity

The largest racial or ethnic group in Cass County is White (non-Hispanic), making up 71.2% of the population. Hispanic or Latino residents account for 21.9%. The Black or African American population (3.7%) is well below the state average of 13.6%. The Asian population (0.8%) is well below the state average of 5.8%.

Education

20.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 46% 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 86.7%.