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St. Mary, MT
Full City Profile · Montana · Glacier County County
2.4
/5.0
C
Fair
209
Population
279/sq mi density
40°F
Avg Temperature
269 sunny days/yr
83
Violent Crime/100K
2,653 property/100K
C
Overall
2.4 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
83 violent crimes/100K
B+
Education
3.7 / 5.0
34.3% bachelor's degree or higher
Change Over Time (2021–2023)
Population Change
-57.4%
491 → 209
over 2 years
Annual Pop. Growth
-34.76%
Compound annual growth rate
Population Over Time
Total population for St. Mary across each available Census ACS release.
Projected 2030
Simple projections extrapolating the 2021–2023 compound annual growth rate forward. These are mathematical extensions of recent trends, not forecasts — real outcomes depend on migration, policy and economic shifts.
Projected Population 2030
11
-198 from 2023 (209)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2021 | 491 | — | — | — |
| 2023 | 209 | -57.4% | — | — |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.