Plymouth County, Iowa Demographics 2026

Population Overview

Plymouth County is located in Iowa with a total population of 25,699. It is the 24th most populous county out of 99 in Iowa.

Age Demographics

The median age in Plymouth County is 41.1 years. This is 6% higher than the state median of 38.6 years.

Economy, Income & Housing

The median household income in Plymouth County is $81,600. This is 12% higher than the state median of $73,147. Compared to the national median of $78,538, household income here is 4% higher. The poverty rate stands at 6.8%. This is 38% lower than the state poverty rate of 11.0%. The unemployment rate is 1.9%. This is 49% lower than the state rate of 3.6%. The median home value is $218,600. Housing costs are 12% higher than the state median of $195,900. With a home-value-to-income ratio of just 2.7x, Plymouth County is one of the most affordable housing markets in the area. 73.7% of occupied housing units are owner-occupied. This homeownership rate is 3% higher than the state average of 71.5%.

Race & Ethnicity

Plymouth County has a predominantly White (non-Hispanic) population, comprising 88.8% of all residents. Hispanic or Latino residents account for 6.1%. The Asian population (0.5%) is well below the state average of 2.4%.

Education

23.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 23% 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 94.2%.