Demographics & People — St. Mary, Montana
Population Overview
| Population (Census) | 209 |
|---|
| Estimated 2026 | ~200 |
|---|
| Median Age | 25.8 |
|---|
| Total Households | 25 |
|---|
| Family Households | 8 |
|---|
| Average Household Size | 1.6 |
|---|
| Diversity Index | 0.2449 (somewhat diverse) |
|---|
Race & Ethnicity
| White | 162 |
|---|
| Black or African American | 0 |
|---|
| Asian | 0 |
|---|
| Hispanic or Latino | 27 |
|---|
Heritage & Ancestry
| Group | Count |
|---|
| Unclassified or not reported | 77 |
| German | 63 |
| Irish | 48 |
| Other groups | 43 |
| Hispanic: Hispanic or Latino | 31 |
| English | 22 |
| Hispanic: Other Hispanic or Latino | 17 |
| Hispanic: All other Hispanic or Latino | 17 |
| Italian | 16 |
| Hispanic: Mexican | 14 |
Language
| English Only | 120 |
|---|
| Spanish | 27 |
|---|
| Population 5+ | 209 |
|---|
Veterans
| Veterans | 18 |
|---|
| Population 18+ | 225 |
|---|
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013 (county fallback). Data for St. Mary, Montana.
