Sioux County, Iowa Demographics 2026

Population Overview

Sioux County is located in Iowa with a total population of 35,984. It is the 19th most populous county out of 99 in Iowa.

Age Demographics

The median age in Sioux County is 34.0 years. This is 12% lower than the state median of 38.6 years.

Economy, Income & Housing

The median household income in Sioux County is $84,736. This is 16% higher than the state median of $73,147. Compared to the national median of $78,538, household income here is 8% higher. The poverty rate stands at 6.4%. This is 41% lower than the state poverty rate of 11.0%. The unemployment rate is 2.0%. This is 45% lower than the state rate of 3.6%. The median home value is $235,600. Housing costs are 20% higher than the state median of $195,900. With a home-value-to-income ratio of just 2.8x, Sioux County is one of the most affordable housing markets in the area. 77.8% of occupied housing units are owner-occupied. This homeownership rate is 9% higher than the state average of 71.5%.

Race & Ethnicity

The largest racial or ethnic group in Sioux County is White (non-Hispanic), making up 83.6% of the population. Hispanic or Latino residents account for 13.8%. The Black or African American population (0.6%) is well below the state average of 3.8%. The Hispanic or Latino population is significantly higher than the state average (13.8% vs 7.0%). The Asian population (0.6%) is well below the state average of 2.4%.

Education

30.4% of residents aged 25 and older hold a bachelor's degree or higher. This is 2% 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 90.6%.