St. Marys, Kansas Demographics & Population 2026
During the 2020–2024 ACS period, St. Marys, Kansas had a total population of 2,788, the 95th largest city in Kansas, with a median household income of $76,771, which is 3% higher than the state average. The poverty rate is 8.6%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
St. Marys Quick Facts
How St. Marys 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 | 2,795 | 2,788 | -0.3% |
| Median household income | $71,723 | $76,771 | +7.0% |
| Median home value | $196,300 | $206,900 | +5.4% |
How St. Marys 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: 45 | National average: 61
Education
Educational Attainment (Adults 25+)
St. Marys Rankings in Kansas
Explore Kansas Rankings
Other Cities in Pottawatomie County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Wamego | 4,386 | $78,809 | 5.2% | $198,300 |
| St. George | 1,039 | $100,956 | 5.3% | $253,500 |
| Onaga | 727 | $49,444 | 13.6% | $116,200 |
| Westmoreland | 703 | $64,750 | 11.3% | $145,500 |
| Olsburg | 269 | $77,083 | 17.1% | $150,700 |
| Emmett | 178 | $56,250 | 19.7% | $98,800 |
| Belvue | 175 | $81,111 | 8.0% | $184,400 |
| Louisville | 175 | N/A | 4.6% | $57,100 |
| Havensville | 172 | $140,134 | 2.9% | N/A |
| Wheaton | 72 | $75,417 | 4.2% | $85,700 |
Cities Similar to St. Marys
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Osage City | 2,828 | $71,191 | $155,800 | 18.9% | 8.9% |
| Clearwater | 2,716 | $83,879 | $216,200 | 31.4% | 5.5% |
| Holcomb | 2,577 | $78,571 | $231,000 | 18.9% | 12.2% |
| Halstead | 2,516 | $76,250 | $163,000 | 23.2% | 10.8% |
| Hillsboro | 2,700 | $63,462 | $120,500 | 37.2% | 8.9% |
Population Overview
St. Marys is a small community located in Kansas, within Pottawatomie County. The total population is 2,788. It ranks as the 95th most populous out of 721 Census-designated places in Kansas.
Age Demographics
The median age in St. Marys is 26.6 years. This is 29% lower than the state median of 37.4 years.
Economy, Income & Housing
The median household income in St. Marys is $76,771. This is 3% higher than the state median of $74,275. It is also 5% lower than the national median of $80,734. The poverty rate stands at 8.6%. This is 24% lower than the state poverty rate of 11.3%. The unemployment rate is 4.4%. This is 12% higher than the state rate of 3.9%. The median home value is $206,900. Housing costs are 5% lower than the state median of $217,200. With a home-value-to-income ratio of just 2.7x, St. Marys is one of the most affordable housing markets in the area. 64.3% of occupied housing units are owner-occupied. This homeownership rate is 4% lower than the state average of 67.2%.
Race & Ethnicity
The largest racial or ethnic group in St. Marys is White (non-Hispanic), making up 79.2% of the population. Hispanic or Latino residents account for 9.6%. The Black or African American population (0.5%) is well below the state average of 5.1%.
Education
24.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 31% lower than the state rate of 35.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.3%.
Data Sources & Methodology
All demographic data for St. Marys, Kansas 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 Kansas state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 721 Census-designated places in Kansas. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
Free data download: Get all Kansas city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of St. Marys, Kansas?
St. Marys, Kansas has a population of 2,788 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in St. Marys, KS?
The median household income in St. Marys is $76,771, which is 5% lower than the national median of $80,734.
What is the poverty rate in St. Marys, KS?
The poverty rate in St. Marys is 8.6%. This means approximately 236 residents live below the federal poverty line.
What is the racial makeup of St. Marys, Kansas?
St. Marys's population is 79.2% White, 0.5% Black, 9.6% Hispanic/Latino, and 2.4% Asian.
What is the median home value in St. Marys, KS?
The median home value in St. Marys is $206,900. The home-value-to-income ratio is 2.7x.
How educated is St. Marys, Kansas?
24.7% of adults (25+) in St. Marys hold a bachelor's degree or higher, and 4.7% hold a graduate or professional degree.