Grundy County, Illinois Demographics 2026

Population Overview

Grundy County is located in Illinois with a total population of 52,920. It is the 26th most populous county out of 102 in Illinois.

Age Demographics

The median age in Grundy County is 38.6 years. This is about average than the state median of 38.9 years.

Economy, Income & Housing

The median household income in Grundy County is $93,060. This is 14% higher than the state median of $81,702. Compared to the national median of $78,538, household income here is 18% higher. The poverty rate stands at 6.3%. This is 46% lower than the state poverty rate of 11.7%. The unemployment rate is 4.5%. This is 22% lower than the state rate of 5.8%. The median home value is $259,200. Housing costs are 3% higher than the state median of $250,500. With a home-value-to-income ratio of just 2.8x, Grundy County is one of the most affordable housing markets in the area. 75.8% of occupied housing units are owner-occupied. This homeownership rate is 13% higher than the state average of 66.8%.

Race & Ethnicity

The largest racial or ethnic group in Grundy County is White (non-Hispanic), making up 83.3% of the population. Hispanic or Latino residents account for 11.5%. The Black or African American population (2.1%) is well below the state average of 13.6%. The Asian population (0.4%) is well below the state average of 5.8%.

Education

24.2% 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 94.2%.