Bertram, Iowa Demographics & Population 2026

A note before these figures: with a population of 239, Bertram'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

Bertram is a small community located in Iowa, within Linn County. The total population is 239. It ranks as the 666th most populous out of 1,017 Census-designated places in Iowa.

Age Demographics

The median age in Bertram is 54.3 years. This is 41% higher than the state median of 38.6 years. Only 12.6% of residents are under 18, indicating fewer families with children. 14.2% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Bertram is $86,786. This is 16% higher than the state median of $75,059. It is also 7% higher than the national median of $80,734. The poverty rate stands at 2.5%. This is 77% lower than the state poverty rate of 11.1%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The survey records no unemployed residents in Bertram, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $296,700. Housing costs are 43% higher than the state median of $208,000. The home-value-to-income ratio is 3.4x. 86.8% of occupied housing units are owner-occupied. This homeownership rate is 21% higher than the state average of 71.7%.

Race & Ethnicity

Bertram has a predominantly White (non-Hispanic) population, comprising 91.6% of all residents. Hispanic or Latino residents account for 4.6%.

Education

33.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 6% 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 99.0%. Notably, 15.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Bertram, 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.