Defiance, Missouri Demographics & Population 2026

A note before these figures: with a population of 63, Defiance'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

Defiance is a small community located in Missouri, within St. Charles County. The total population is 63. It ranks as the 953rd most populous out of 1,062 Census-designated places in Missouri.

Age Demographics

The median age in Defiance is 64.3 years. This is 65% higher than the state median of 39.0 years. 11.1% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The ACS records no residents below the poverty line in Defiance. 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 survey records no unemployed residents in Defiance, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $512,500. Housing costs are 123% higher than the state median of $230,300. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 47% higher than the state average of 68.1%.

Race & Ethnicity

Every resident counted in Defiance 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

0.0% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. 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 Defiance, Missouri 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 Missouri state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,062 Census-designated places in Missouri. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.