Marne, Iowa Demographics & Population 2026

A note before these figures: with a population of 98, Marne'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

Marne is a small community located in Iowa, within Cass County. The total population is 98. It ranks as the 863rd most populous out of 1,017 Census-designated places in Iowa.

Age Demographics

The median age in Marne is 42.7 years. This is 11% higher than the state median of 38.6 years.

Economy, Income & Housing

The median household income in Marne is $61,875. This is 18% lower than the state median of $75,059. It is also 23% lower than the national median of $80,734. The poverty rate stands at 5.1%. This is 54% lower than the state poverty rate of 11.1%. The unemployment rate is 3.9%. This is 8% higher than the state rate of 3.6%. The median home value is $98,800. Housing costs are 53% lower than the state median of $208,000. With a home-value-to-income ratio of just 1.6x, Marne is one of the most affordable housing markets in the area. 78.7% of occupied housing units are owner-occupied. This homeownership rate is 10% higher than the state average of 71.7%.

Race & Ethnicity

Marne has a predominantly White (non-Hispanic) population, comprising 96.9% of all residents.

Education

21.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 32% lower 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.

Data Sources & Methodology

All demographic data for Marne, 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.