City in Elk County, Pennsylvania · 99.3 sq mi · 122 people per sq mi
12,154 people live in St. Marys. The typical household earns $67,167, and the median resident is 51.6 years old.
2026 projection
From 12,738 in 2020
Poverty rate 7.85%
Men 52.6 · Women 50.5
1860–2026
12,154
2026 projection
4.6% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1860–2026
12,154
2026 projection
4.6% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 12,154 | -99 | 0.81% |
|---|---|---|---|
| 2025 | 12,253 | -68 | 0.55% |
| 2024 | 12,321 | -64 | 0.52% |
| 2023 | 12,385 | -113 | 0.90% |
| 2022 | 12,498 | -147 | 1.16% |
| 2021 | 12,645 | -93 | 0.73% |
| 2020 | 12,738 | -37 | 0.29% |
| 2019 | 12,775 | -24 | 0.19% |
| 2018 | 12,799 | -14 | 0.11% |
| 2017 | 12,813 | -40 | 0.31% |
Showing 10 of 32 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
St. Marys has a population change lower than Elk County, Pennsylvania, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 125 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 13 residents
51% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 51% | 53% | 50% |
| Never married | 27% | 32% | 21% |
| Divorced | 12% | 10% | 14% |
| Widowed | 8% | 5% | 12% |
| Separated | 2% | 1% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources