Demographics & People — St. Marys, Kansas
Population Overview
| Population (Census) | 2,795 |
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| Estimated 2026 | ~2,800 |
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| Median Age | 26.6 |
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| Total Households | 833 |
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| Family Households | 639 |
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| Average Household Size | 3.31 |
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| Diversity Index | 0.184 (relatively homogeneous) |
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Race & Ethnicity
| White | 2,475 |
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| Black or African American | 20 |
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| Asian | 27 |
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| Hispanic or Latino | 230 |
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Heritage & Ancestry
| Group | Count |
|---|
| Unclassified or not reported | 1,025 |
| German | 560 |
| Irish | 543 |
| Italian | 339 |
| Other groups | 275 |
| Hispanic: Hispanic or Latino | 188 |
| English | 153 |
| French (except Basque) | 105 |
| Polish | 98 |
| Hispanic: Mexican | 91 |
Language
| English Only | 2,463 |
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| Spanish | 47 |
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| Population 5+ | 2,547 |
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Veterans
| Veterans | 184 |
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| Population 18+ | 1,883 |
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Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for St. Marys, Kansas.
