Diamondhead Lake, Iowa Demographics & Population 2026

A note before these figures: with a population of 285, Diamondhead Lake'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

Diamondhead Lake is a small community located in Iowa, within Guthrie County. The total population is 285. It ranks as the 617th most populous out of 1,017 Census-designated places in Iowa.

Age Demographics

The median age in Diamondhead Lake is 58.4 years. This is 51% higher than the state median of 38.6 years. Only 3.9% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Diamondhead Lake is $148,542. This is 98% higher than the state median of $75,059. It is also 84% higher than the national median of $80,734. The ACS records no residents below the poverty line in Diamondhead Lake. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The unemployment rate is 5.0%. This is 38% higher than the state rate of 3.6%. The median home value is $411,800. Housing costs are 98% higher than the state median of $208,000. With a home-value-to-income ratio of just 2.8x, Diamondhead Lake is one of the most affordable housing markets in the area. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 39% higher than the state average of 71.7%.

Race & Ethnicity

Diamondhead Lake has a predominantly White (non-Hispanic) population, comprising 88.1% of all residents.

Education

51.6% of residents aged 25 and older hold a bachelor's degree or higher. This places Diamondhead Lake in the top 10% of all cities in the state for educational attainment. This is 64% higher than the state rate of 31.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample. Notably, 17.8% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Diamondhead Lake, 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.