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St. Marys city, PA
ZIP 15857 — People & Community
Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.
Middle ClassLow Snow Area
Demographics, education attainment, health access, and community lifestyle
Population & Demographics in 15857
15857 has a population of 12,825 with a median age of 49.8 yrs (48.3% male).
Health & Community Indicators in 15857
Historical Trends in 15857 (2020–Present)
Since 2020, population grew 3.2%, median income rose 0.3% (inflation-adjusted), home values increased 1.7%.
People & Community key statistics
| Population | |
|---|---|
| Population | 12,825 |
| Median age | 49.8 |
| Poverty rate | 8.3% |
| Demographics | |
|---|---|
| White | 94.2% |
| Hispanic | 1.6% |
| Black | 1.7% |
| Asian | 0.3% |
| Foreign-born | 26.8% |