St. Mary, Missouri Demographics & Population 2026
During the 2020–2024 ACS period, St. Mary, Missouri had a total population of 285, the 650th largest city in Missouri, with a median household income of $49,643, which is 30% lower than the state average. The poverty rate is 25.1%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- More than 1 in 4 residents live below the poverty line (25.1%), well above the national average of 12.4%.
- Housing is very affordable with a home-value-to-income ratio of just 2.4x.
St. Mary Quick Facts
How St. Mary Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 255 | 285 | +11.8% |
| Median household income | $57,500 | $49,643 | -13.7% |
| Median home value | $97,500 | $120,000 | +23.1% |
How St. Mary Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 40 | National average: 61
Education
Educational Attainment (Adults 25+)
St. Mary Rankings in Missouri
Explore Missouri Rankings
Other Cities in Ste. Genevieve County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Ste. Genevieve | 5,010 | $48,097 | 12.8% | $172,400 |
| Bloomsdale | 841 | $101,736 | 9.0% | $244,000 |
| Grayhawk | 538 | $49,304 | 9.3% | $121,000 |
| Ozora | 299 | N/A | 49.5% | $188,500 |
| Weingarten | 114 | $49,514 | 15.8% | N/A |
Cities Similar to St. Mary
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Macks Creek | 290 | N/A | $275,000 | 8.5% | 25.9% |
| Risco | 288 | $48,000 | $62,300 | 4.2% | 25.4% |
| Cooter | 285 | $46,250 | $73,900 | 6.9% | 18.6% |
| Fillmore | 299 | N/A | $83,100 | 3.7% | 5.3% |
| Ozora | 299 | N/A | $188,500 | 31.8% | 49.5% |
A note before these figures: with a population of 285, St. Mary'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
St. Mary is a small community located in Missouri, within Ste. Genevieve County. The total population is 285. It ranks as the 650th most populous out of 1,062 Census-designated places in Missouri.
Age Demographics
The median age in St. Mary is 48.9 years. This is 25% higher than the state median of 39.0 years.
Economy, Income & Housing
The median household income in St. Mary is $49,643. This is 30% lower than the state median of $70,702. It is also 39% lower than the national median of $80,734. The poverty rate stands at 25.1%. This is 99% higher than the state poverty rate of 12.6%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 7.3%. This is 81% higher than the state rate of 4.0%. The median home value is $120,000. Housing costs are 48% lower than the state median of $230,300. With a home-value-to-income ratio of just 2.4x, St. Mary is one of the most affordable housing markets in the area. 66.7% of occupied housing units are owner-occupied. This homeownership rate is 2% lower than the state average of 68.1%.
Race & Ethnicity
St. Mary has a predominantly White (non-Hispanic) population, comprising 87.7% of all residents. Black or African American residents account for 3.2%. The Black or African American population (3.2%) is well below the state average of 10.9%. The Hispanic or Latino population (0.4%) is well below the state average of 5.2%.
Education
10.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 67% lower than the state rate of 32.4%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 76.9%.
Data Sources & Methodology
All demographic data for St. Mary, 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.
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Frequently Asked Questions
What is the population of St. Mary, Missouri?
St. Mary, Missouri has a population of 285 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in St. Mary, MO?
The median household income in St. Mary is $49,643, which is 39% lower than the national median of $80,734.
What is the poverty rate in St. Mary, MO?
The poverty rate in St. Mary is 25.1%. This means approximately 71 residents live below the federal poverty line.
What is the racial makeup of St. Mary, Missouri?
St. Mary's population is 87.7% White, 3.2% Black, 0.4% Hispanic/Latino, and 0.0% Asian.
What is the median home value in St. Mary, MO?
The median home value in St. Mary is $120,000. The home-value-to-income ratio is 2.4x.
How educated is St. Mary, Missouri?
10.6% of adults (25+) in St. Mary hold a bachelor's degree or higher, and 4.8% hold a graduate or professional degree.