Denmark, Iowa Demographics & Population 2026

A note before these figures: with a population of 835, Denmark's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Denmark is a small community located in Iowa, within Lee County. The total population is 835. It ranks as the 334th most populous out of 1,017 Census-designated places in Iowa.

Age Demographics

The median age in Denmark is 28.9 years. This is 25% lower than the state median of 38.6 years. With 28.4% of the population under 18, Denmark has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Denmark is $136,875. This is 82% higher than the state median of $75,059. It is also 70% higher than the national median of $80,734. The poverty rate stands at 1.0%. This is 91% lower than the state poverty rate of 11.1%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 6.5%. This is 81% higher than the state rate of 3.6%. The median home value is $194,400. Housing costs are 7% lower than the state median of $208,000. With a home-value-to-income ratio of just 1.4x, Denmark is one of the most affordable housing markets in the area. 91.1% of occupied housing units are owner-occupied. This homeownership rate is 27% higher than the state average of 71.7%.

Race & Ethnicity

Denmark has a predominantly White (non-Hispanic) population, comprising 97.6% of all residents. Hispanic or Latino residents account for 2.4%. The Hispanic or Latino population (2.4%) is well below the state average of 7.3%.

Education

40.3% of residents aged 25 and older hold a bachelor's degree or higher. This places Denmark in the top 10% of all cities in the state for educational attainment. This is 28% higher than the state rate of 31.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 97.8%. Notably, 31.1% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Denmark, Iowa is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Iowa state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,017 Census-designated places in Iowa. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.