Green Mountain, Iowa Demographics & Population 2026

A note before these figures: with a population of 87, Green Mountain'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

Green Mountain is a small community located in Iowa, within Marshall County. The total population is 87. It ranks as the 879th most populous out of 1,017 Census-designated places in Iowa.

Age Demographics

The median age in Green Mountain is 63.6 years. This is 65% higher than the state median of 38.6 years.

Economy, Income & Housing

The median household income in Green Mountain is $36,696. This is 51% lower than the state median of $75,059. It is also 55% lower than the national median of $80,734. The poverty rate stands at 13.8%. This is 24% higher than the state poverty rate of 11.1%. The survey records no unemployed residents in Green Mountain, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $75,000. Housing costs are 64% lower than the state median of $208,000. With a home-value-to-income ratio of just 2.0x, Green Mountain is one of the most affordable housing markets in the area. 93.0% of occupied housing units are owner-occupied. This homeownership rate is 30% higher than the state average of 71.7%.

Race & Ethnicity

Every resident counted in Green Mountain was recorded as White (non-Hispanic). A figure of exactly 100.0% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.

Education

9.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 71% 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 Green Mountain, 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.