St. Mary, Kentucky Demographics & Population 2026
During the 2020–2024 ACS period, St. Mary, Kentucky had a total population of 147, the 495th largest city in Kentucky, with a median household income of $47,500, which is 25% lower than the state average. The poverty rate is 3.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- An exceptionally low poverty rate of 3.4% — among the lowest in Kentucky.
- Unemployment rate of 8.3% is notably above the national average.
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 | 210 | 147 | -30.0% |
| Median household income | $60,833 | $47,500 | -21.9% |
| Median home value | $177,600 | $157,100 | -11.5% |
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: 33 | National average: 61
Education
Educational Attainment (Adults 25+)
St. Mary Rankings in Kentucky
Explore Kentucky Rankings
Other Cities in Marion County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Lebanon | 6,430 | $45,479 | 25.6% | $149,700 |
| Loretto | 683 | $61,250 | 8.2% | $183,100 |
| Bradfordsville | 444 | $29,722 | 22.7% | N/A |
| Raywick | 125 | $37,273 | 22.4% | $101,800 |
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 |
|---|---|---|---|---|---|
| Anthoston | 144 | N/A | $167,900 | 0.0% | 22.9% |
| St. Joseph | 144 | N/A | N/A | 100.0% | 85.4% |
| Smithfield | 153 | $49,375 | $171,900 | 2.2% | 17.6% |
| Allensville | 158 | N/A | $80,000 | 0.0% | 5.1% |
| Water Valley | 137 | $42,143 | $77,100 | 0.0% | 0.0% |
A note before these figures: with a population of 147, 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 Kentucky, within Marion County. The total population is 147. It ranks as the 495th most populous out of 552 Census-designated places in Kentucky.
Age Demographics
The median age in St. Mary is 34.6 years. This is 12% lower than the state median of 39.1 years. With 38.8% of the population under 18, St. Mary has a notably young demographic profile, suggesting a family-oriented community.
Economy, Income & Housing
The median household income in St. Mary is $47,500. This is 25% lower than the state median of $63,726. It is also 41% lower than the national median of $80,734. The poverty rate stands at 3.4%. This is 79% lower than the state poverty rate of 16.1%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 8.3%. This is 71% higher than the state rate of 4.9%. The median home value is $157,100. Housing costs are 24% lower than the state median of $205,600. The home-value-to-income ratio is 3.3x. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 46% higher than the state average of 68.3%.
Race & Ethnicity
St. Mary has a predominantly White (non-Hispanic) population, comprising 87.1% of all residents. Black or African American residents account for 2.0%. The Black or African American population (2.0%) is well below the state average of 7.5%.
Education
25.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 7% lower than the state rate of 27.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 86.1%.
Data Sources & Methodology
All demographic data for St. Mary, Kentucky 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 Kentucky state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 552 Census-designated places in Kentucky. 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, Kentucky?
St. Mary, Kentucky has a population of 147 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in St. Mary, KY?
The median household income in St. Mary is $47,500, which is 41% lower than the national median of $80,734.
What is the poverty rate in St. Mary, KY?
The poverty rate in St. Mary is 3.4%. This means approximately 5 residents live below the federal poverty line.
What is the racial makeup of St. Mary, Kentucky?
St. Mary's population is 87.1% White, 2.0% Black, 0.0% Hispanic/Latino, and 0.0% Asian.
What is the median home value in St. Mary, KY?
The median home value in St. Mary is $157,100. The home-value-to-income ratio is 3.3x.
How educated is St. Mary, Kentucky?
25.6% of adults (25+) in St. Mary hold a bachelor's degree or higher, and 8.1% hold a graduate or professional degree.