Marshall County, Illinois Demographics 2026

Population Overview

Marshall County is located in Illinois with a total population of 11,715. It is the 85th most populous county out of 102 in Illinois.

Age Demographics

The median age in Marshall County is 45.9 years. This is 18% higher than the state median of 38.9 years. 10.2% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Marshall County is $69,818. This is 15% lower than the state median of $81,702. Compared to the national median of $78,538, household income here is 11% lower. The poverty rate stands at 11.7%. This is about average than the state poverty rate of 11.7%. The unemployment rate is 4.7%. This is 19% lower than the state rate of 5.8%. The median home value is $137,800. Housing costs are 45% lower than the state median of $250,500. With a home-value-to-income ratio of just 2.0x, Marshall County is one of the most affordable housing markets in the area. 79.7% of occupied housing units are owner-occupied. This homeownership rate is 19% higher than the state average of 66.8%.

Race & Ethnicity

Marshall County has a predominantly White (non-Hispanic) population, comprising 92.4% of all residents. Hispanic or Latino residents account for 3.2%. The White (non-Hispanic) population is significantly higher than the state average (92.4% vs 58.8%). The Black or African American population (0.4%) is well below the state average of 13.6%. The Hispanic or Latino population (3.2%) is well below the state average of 18.5%. The Asian population (0.1%) is well below the state average of 5.8%.

Education

18.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 50% 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 91.0%.