Seneca County, Ohio Demographics 2026

Population Overview

Seneca County is located in Ohio with a total population of 54,861. It is the 47th most populous county out of 88 in Ohio. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Seneca County is 40.5 years. This is 2% higher than the state median of 39.6 years.

Economy, Income & Housing

The median household income in Seneca County is $65,020. This is 7% lower than the state median of $69,680. Compared to the national median of $78,538, household income here is 17% lower. The poverty rate stands at 11.9%. This is 10% lower than the state poverty rate of 13.2%. The unemployment rate is 4.0%. This is 19% lower than the state rate of 4.9%. The median home value is $136,200. Housing costs are 32% lower than the state median of $199,200. With a home-value-to-income ratio of just 2.1x, Seneca County is one of the most affordable housing markets in the area. 73.4% of occupied housing units are owner-occupied. This homeownership rate is 10% higher than the state average of 67.0%.

Race & Ethnicity

Seneca County has a predominantly White (non-Hispanic) population, comprising 88.3% of all residents. Hispanic or Latino residents account for 5.5%. The Black or African American population (2.6%) is well below the state average of 12.1%. The Asian population (0.5%) is well below the state average of 2.4%.

Education

20.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 33% lower than the state rate of 30.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.2%.