Sullivan County, Indiana Demographics 2026

Population Overview

Sullivan County is located in Indiana with a total population of 20,766. It is the 69th most populous county out of 92 in Indiana. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Sullivan County is 41.3 years. This is 9% higher than the state median of 38.0 years.

Economy, Income & Housing

The median household income in Sullivan County is $54,985. This is 22% lower than the state median of $70,051. Compared to the national median of $78,538, household income here is 30% lower. The poverty rate stands at 13.5%. This is 10% higher than the state poverty rate of 12.2%. The unemployment rate is 5.1%. This is 18% higher than the state rate of 4.3%. The median home value is $122,200. Housing costs are 39% lower than the state median of $201,600. With a home-value-to-income ratio of just 2.2x, Sullivan County is one of the most affordable housing markets in the area. 75.6% of occupied housing units are owner-occupied. This homeownership rate is 7% higher than the state average of 70.3%.

Race & Ethnicity

Sullivan County has a predominantly White (non-Hispanic) population, comprising 90.7% of all residents. Black or African American residents account for 3.3%. The Black or African American population (3.3%) is well below the state average of 9.1%. The Hispanic or Latino population (1.8%) is well below the state average of 8.4%. The Asian population (0.7%) is well below the state average of 2.5%.

Education

14.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 50% lower than the state rate of 28.8%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 88.1%.