St. Marys, Pennsylvania Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of St. Marys, Pennsylvania is 12,612 as of the 2023 American Community Survey, making it the 65th-largest city in Pennsylvania. The median household income is $64,471, the median home value is $143,900, and the median age is 50.3.
The population has declined 5.2% since 2010 (13,033 → 12,361).
12,612
Population
127
People / sq mi
$64,471
Median Income
$143,900
Median Home Value
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St. Marys covers 99.3 sq mi of land at 127 people per square mile.
About St. Marys, PA
St. Marys stands apart on settlement density — it is among the most sparsely settled of US cities, at roughly 127 people per square mile. St. Marys is a city in Pennsylvania with a population of 12,612.
Household earnings are middling, with a median of $64,471 — below the US median of $78,538. Poverty is relatively low for US cities at 3.1%, below the national 12.4%. Home prices sit near the bottom of the range at $143,900, with typical rent around $756.
Fewer adults hold degrees here than in most comparable places — 20.5%, below the national 35.0%. Home-based work is uncommon, at 1.2%, below the national 14.0%, and the average commute runs about 13 minutes each way.
St. Marys city Population History (2010-2024)
The city of St. Marys city had a population of 13,033 in 2010 and 12,361 in 2024, a -5.2% growth over 14 years. The peak was 13,033 in 2010. Average annual growth rate: -0.37%.
12,361
Population (2024)
13,033
Population (2010)
13,033
Peak (2010)
-0.37%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 13,033 |
| 2011 | 13,014 |
| 2012 | 12,936 |
| 2013 | 12,878 |
| 2014 | 12,776 |
| 2015 | 12,646 |
| 2016 | 12,499 |
| 2017 | 12,405 |
| 2018 | 12,340 |
| 2019 | 12,260 |
| 2020 | 12,720 |
| 2021 | 12,653 |
| 2022 | 12,511 |
| 2023 | 12,409 |
| 2024 | 12,361 |
Race & Ethnicity
| White | 94.2% |
| Black or African American | 1.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.4% |
| Two or More Races | 0.0% |
Economy & Income
$64,471
Median Household Income
$36,888
Per Capita Income
3.1%
Poverty Rate
5.4%
Unemployment Rate
Housing
$143,900
Median Home Value
$756
Median Rent
75.7%
Owner-Occupied
Education
94.5%
High School+
20.5%
Bachelor's+
Commute
0.3%
Drive Alone
82.0%
Public Transit
1.2%
Work From Home
13.3 min
Avg Commute
Community Profile
8.5%
Foreign Born
97.0%
Non-English at Home
6.9%
Veterans
16.7%
With Disability
97.8%
Health Insurance
86.7%
Internet Access
Employment by Industry
| Manufacturing | 37.5% |
| Professional, Scientific & Management | 21.6% |
| Arts, Entertainment & Food Services | 4.8% |
| Education, Health Care & Social Services | 4.7% |
| Retail Trade | 4.5% |
| Construction | 4.3% |
| Finance, Insurance & Real Estate | 3.2% |
| Public Administration | 2.8% |
| Information | 2.6% |
| Transportation & Warehousing | 2.1% |
| Agriculture & Mining | 0.2% |
Largest cities in Pennsylvania
Largest counties in Pennsylvania
Part of Pennsylvania
Metro areas in Pennsylvania
City rankings
Frequently Asked Questions
St. Marys, Pennsylvania has a population of 12,612 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 65th-largest city in Pennsylvania.
The median household income in St. Marys, Pennsylvania is $64,471, with 3.1% of residents living below the federal poverty level.
The median home value in St. Marys, Pennsylvania is $143,900, with median monthly rent at $756 and a homeownership rate of 75.7%.
The median age in St. Marys, Pennsylvania is 50.3 years. The population is 47.7% male and 52.3% female.
The population has declined 5.2% since 2010 (13,033 → 12,361).
Where to stay in St. Marys
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.