United States › Pennsylvania › St. Marys CITY
St. Marys Pennsylvania · 12,253 residents (2025 est.) · 99.3 sq mi
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The short version
St. Marys is a city of 12,529 people in Pennsylvania. The median age is 51.6, about 13 years above the US median. Four-year degrees are less common here than nationally, at 21% of adults. The typical home is worth $149,000, having risen by half since 2000. The foreign-born share is 1%. 78% of homes are owner-occupied.
At a glance
Lower income
below the US median
US median: $82,259
Older
median age 51.6
US median: 38.9
Less educated
21% hold a bachelor's degree
US average: 36%
More affordable
home values down 7%, inflation adjusted
US median home: $376,019
Section 01
Population & growth from 14,502 in 2000
12,253 in 2025 (Census Bureau estimate)
from 136 / sq mi in 2009
US average: 281
from 39.4 in 2000
US average: 38.9
Population, 1990 – 2024
5K 7K 10K 13K 15K 1990 2000 2010 2020 2024 St. Marys Age distribution, 2024
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02
Income & economy $67,167
−11%inflation adjusted, since 2000
from $41,593 in 2000
US average: $82,259
from $19,885 in 2000
US average: $44,673
Households earning $100K+
from 25.1% in 2009
US average: 53.3%
from 4.8% in 2000
US average: 12.5%
from 0.401 in 2010
US average: 0.476
Workforce by industry, 2024
Professional, scientific, technical 4.3%
Transportation & warehousing 3.5%
Arts, entertainment, food 2.1%
Public administration 1.4%
Agriculture, forestry, fishing 0.3%
Education & health services 0%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
$149,000
−7%inflation adjusted, since 2000
from $87,900 in 2000
US average: $376,019
$762
−8%inflation adjusted, since 2000
from $454 in 2000
US average: $1,442
from 77.4% in 2000
22.4% rent
from 6.6% in 2009
US average: 10.0%
from 2.32 people in 2009
US average: 2.54
from 16.6% in 2009
US average: 22.9%
from 43.4% in 2009
US average: 47.4%
from 2.4 in 2009
Years of local income it takes to buy a local home, on a scale of about 0 to 15. Lower is more affordable.
Our index, 0 to 100. Higher means faster recent growth in incomes, home values, and college degrees.
Section 04
Race & ethnicity 2000
White, non-Hispanic 98.6%(14,299)
Hispanic / Latino 0.3%(44)
2024
White, non-Hispanic 93.8%(11,756)
Hispanic / Latino 1.6%(196)
from 4 in 2009
Our index, 0 to 100. Higher means a more even mix of racial and ethnic groups.
Section 04 · Origins
Detailed origins & ancestry Ancestry
+ 18 more ancestry groups with data from 15.5% in 2000
US average: 35.6%
High school or higher
from 84.4% in 2000
US average: 89.6%
from 4.9% in 2000
US average: 14.0%
Section 06
Commute & transportation from 10.2 min in 2000
US average: 26.5
from 87.1% in 2009
US average: 68.9%
from 6.9% in 2009
US average: 8.5%
from 0.7% in 2009
US average: 3.2%
from 1.1% in 2009
US average: 15.0%
from 2.5% in 2009
US average: 2.4%
from 0.0% in 2009
US average: 0.4%
from 6.9% in 2009
US average: 8.3%
Section 07
Work & employment from 5.7% in 2011
US average: 5.2%
from 62.6% in 2011
US average: 63.5%
Women 20-64 in the labor force
from 88.2% in 2020
US average: 74.6%
from 8.4% in 2009
US average: 13.1%
from 26.7% in 2009
US average: 42.5%
Section 08
People & community from 0.4% in 2009
US average: 14.1%
from 13.3% in 2009
US average: 6.2%
from 13.7% in 2012
US average: 13.3%
from 6.1% in 2013
US average: 8.4%
from 76.2% in 2017
US average: 91.0%
Computer in household
from 84.0% in 2020
US average: 95.5%
from 88.3% in 2020
US average: 87.7%
from 98.3% in 2016
US average: 77.7%
from 0.2% in 2016
US average: 13.6%
Marital status
Men 15+
Never married 31.6%(1,704)
Women 15+
Never married 21.4%(1,154)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09
Health coverage from 6.1% in 2013
US average: 8.4%
from 58.6% in 2020
US average: 54.8%
Direct-purchase
from 19.7% in 2020
US average: 13.8%
from 27.9% in 2020
US average: 18.4%
from 21.4% in 2020
US average: 20.9%
VA health care
from 3.6% in 2020
US average: 2.2%
Any private
from 76.0% in 2020
US average: 67.1%
Any public
from 44.0% in 2020
US average: 36.7%
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans Veterans by period of service, 2024
Gulf War (2001 or later) 10.3%(63)
Gulf War (1990s) 10.5%(64)
Share of the 611 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
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Drill deeper
Places similar to St. Marys Head to head
Compare St. Marys to nearby cities ST. MARYS VS
Warren
Income $53,815 −20%
Home value $103,800 −30%
Population 9,046 −26%
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ST. MARYS VS
Olean
Income $51,261 −24%
Home value $86,100 −42%
Population 13,508 +10%
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ST. MARYS VS
Park Forest
Income $79,120 +18%
Home value $389,600 +161%
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ST. MARYS VS
State College
Income $45,424 −32%
Home value $437,800 +194%
Population 40,844 +233%
SEE FULL COMPARISON →
Frequently asked
How many people live in St. Marys, Pennsylvania? St. Marys, Pennsylvania has about 12,529 residents according to the 2024 American Community Survey.
What is the median household income in St. Marys, Pennsylvania? The typical household in St. Marys, Pennsylvania earns about $67,167 a year. Half of households make more than that, and half make less.
Is St. Marys, Pennsylvania expensive? In St. Marys, Pennsylvania, the median home is worth about $149,000, and the typical rent is about $762 a month.
How educated are people in St. Marys, Pennsylvania? About 21.4% of adults age 25 and over in St. Marys, Pennsylvania hold a bachelor's degree or higher.
What is the poverty rate in St. Marys, Pennsylvania? About 7.8% of people in St. Marys, Pennsylvania live below the federal poverty line.
Has St. Marys, Pennsylvania grown since 1990? Yes, St. Marys, Pennsylvania has grown since 1990. The population has added about 7,018 residents, a change of about 127 percent over that period.
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