Greene County, Illinois Demographics 2026

Population Overview

Greene County is located in Illinois with a total population of 11,837. It is the 84th most populous county out of 102 in Illinois.

Age Demographics

The median age in Greene County is 43.1 years. This is 11% higher than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Greene County is $60,976. This is 25% lower than the state median of $81,702. Compared to the national median of $78,538, household income here is 22% lower. The poverty rate stands at 14.2%. This is 21% higher than the state poverty rate of 11.7%. The unemployment rate is 4.2%. This is 28% lower than the state rate of 5.8%. The median home value is $94,400. Housing costs are 62% lower than the state median of $250,500. With a home-value-to-income ratio of just 1.5x, Greene County is one of the most affordable housing markets in the area. 76.8% of occupied housing units are owner-occupied. This homeownership rate is 15% higher than the state average of 66.8%.

Race & Ethnicity

Greene County has a predominantly White (non-Hispanic) population, comprising 96.0% of all residents. Hispanic or Latino residents account for 1.0%. The White (non-Hispanic) population is significantly higher than the state average (96.0% 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 (1.0%) is well below the state average of 18.5%. The Asian population (0.3%) is well below the state average of 5.8%.

Education

16.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 56% 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 90.4%.