Clark County, Illinois Demographics 2026

Population Overview

Clark County is located in Illinois with a total population of 15,328. It is the 71st most populous county out of 102 in Illinois.

Age Demographics

The median age in Clark County is 42.0 years. This is 8% higher than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Clark County is $70,625. This is 14% lower than the state median of $81,702. Compared to the national median of $78,538, household income here is 10% lower. The poverty rate stands at 9.5%. This is 19% lower than the state poverty rate of 11.7%. The unemployment rate is 4.0%. This is 31% lower than the state rate of 5.8%. The median home value is $123,100. Housing costs are 51% lower than the state median of $250,500. With a home-value-to-income ratio of just 1.7x, Clark County is one of the most affordable housing markets in the area. 81.7% of occupied housing units are owner-occupied. This homeownership rate is 22% higher than the state average of 66.8%.

Race & Ethnicity

Clark County has a predominantly White (non-Hispanic) population, comprising 95.6% of all residents. Hispanic or Latino residents account for 1.8%. The White (non-Hispanic) population is significantly higher than the state average (95.6% vs 58.8%). The Black or African American population (0.7%) is well below the state average of 13.6%. The Hispanic or Latino population (1.8%) is well below the state average of 18.5%. The Asian population (0.2%) is well below the state average of 5.8%.

Education

24.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 35% 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 92.0%.