Saint Marys, PA demographics:
population, income, and more

Total population
12,736
-0.7% year-over-year change
Median household income
$67,662/yr
4.3% year-over-year change
Housing units
6,394
2.0% year-over-year change

Saint Marys population

How many people live in Saint Marys

Saint Marys is home to 12,736 residents, according to the most recent Census data. Gender-wise, 49.2% of Saint Marys locals are male, and 50.8% are female.

Total population
12,736
-0.7% year-over-year change
Gender ratio
Male
49.2%
6,262
Female
50.8%
6,474
Value Percent YoY change
Male 6,262 49.2% 1.2%
Female 6,474 50.8% -2.5%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Saint Marys is 51, with the population distributed as follows: about 14.6% are children under 15, then 9.2% are in the 15 to 24 age group. Adults between 25 and 44 make up 20.2% of the population, while another 29.6% fall into the 45 to 64 bracket. Finally, around 26.4% are 65 or older.

Median age
50.9
Age breakdown
Under 15
14.6%
15 to 24
9.2%
25 to 44
20.2%
45 to 64
29.6%
Over 65
26.4%
Value Percent YoY change
Under 15 1,858 14.6% -5.9%
15 to 24 1,172 9.2% 3.6%
25 to 44 2,573 20.2% -3.7%
45 to 64 3,774 29.6% 0.2%
Over 65 3,359 26.4% 2.5%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Saint Marys, 97.8% of the population are US-born citizens, while 1.8% have gained naturalized citizenship. At the same time, 0.3% of residents are non-citizens. As for race, 94.8% of locals are Caucasian, 1.3% are African American and 0.2% have Asian roots. There’s also a share of 3.5% that includes residents with two or more races.

Citizenship
U.S.-born citizens
97.8%
Non-U.S.-born citizens
1.8%
Non-citizens
0.3%
Value Percent YoY change
U.S.-born citizens 12,460 97.8% 0.2%
Non-U.S.-born citizens 236 1.8% -10.3%
Non-citizens 40 0.3% -68.0%
Racial breakdown
White
94.8%
Black or African American
1.3%
American Indian and Alaska Native
0%
Asian
0.2%
Native Hawaiian and other Pacific Islander
0%
Two or more races
3.5%
Other
0.3%
Value Percent
White 12,072 94.8%
Black or African American 165 1.3%
Asian 20 0.2%
Two or more races 443 3.5%
Other 36 0.3%

Households in Saint Marys

A peek inside Saint Marys households

Saint Marys has 5,756 households, with an average of 2 members in each. Of these, 61.2% are families, while the remaining 38.8% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
5,756
0.2% year-over-year change
Average people per household
2
Non-family households
2,231
Family households
3,525
Value Percent YoY change
Non-family households 2,231 38.8% -5.0%
Family households 3,525 61.2% 3.7%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Saint Marys

The housing landscape of Saint Marys

Saint Marys's housing consists of 6,394 units, with 82.1% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 0.9% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 3.2% of the housing landscape.

Housing units
6,394
2.0% year-over-year change
Housing types
Value Percent
1 unit, detached 5,247 82.1%
1 unit, attached 57 0.9%
2 units 280 4.4%
3 or 4 units 176 2.8%
5 to 9 units 228 3.6%
10 to 19 units 9 0.1%
20 to 49 units 86 1.4%
50 or more units 107 1.7%
Mobile home 204 3.2%
Homes built since 2020
63
8.6% year-over-year change

The age of buildings in Saint Marys

In Saint Marys, the median construction year is 1962. About 20.4% of homes were built before the 1940s, with another 6.1% going up by 1949. Most development happened in the second half of the 20th century. Then, 3% of homes were added from 2000 to 2009, 2.3% between 2010 and 2019, and 1% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,302 20.4% 9.8%
Built between 1940 and 1949 391 6.1% 13.3%
Built between 1950 and 1959 1,362 21.3% 0.3%
Built between 1960 and 1969 907 14.2% -0.6%
Built between 1970 and 1979 683 10.7% 17.1%
Built between 1980 and 1989 701 11% -5.3%
Built between 1990 and 1999 643 10.1% 3.9%
Built between 2000 and 2009 195 3% -28.6%
Built between 2010 and 2019 147 2.3% -23.4%
Built in 2020 or later 63 1% 8.6%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Saint Marys occupancy rates

Out of the 5,756 occupied housing units in Saint Marys, 77.9% are owner-occupied, while 22.1% are lived in by tenants. Meanwhile, 10% of all homes on the local market sit vacant.

Occupied housing units
5,756
0.2% year-over-year change
Occupancy breakdown
Renter occupied
1,274
Owner occupied
4,482
Value Percent YoY
change
Renter occupied 1,274 22.1% -7.6%
Owner occupied 4,482 77.9% 2.6%
Unoccupied housing units
10.0%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Saint Marys housing costs

Housing costs in Saint Marys come to a median of $710 per month, while tenants specifically pay a median gross rent of $762.

Median housing costs per month
$710/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Saint Marys
$762/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Saint Marys

Saint Marys education at a glance

About 53.8% of the population in Saint Marys went to high school, while 13.6% pursued college studies. Another 11% earned an associate degree and 13.1% hold a bachelor’s. Meanwhile, 7.4% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 117 1.1% -7.9%
High school diploma 5,687 53.8% -2.8%
College diploma 1,432 13.6% 10.7%
Associate degree 1,164 11% 0.9%
Bachelor's degree 1,379 13.1% -3.2%
Graduate degree 784 7.4% 19.1%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Saint Marys

How much people earn in Saint Marys

The average annual household income in Saint Marys was $80,436 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +0.4% change from the previous year. At the same time, the median income stood at $67,662, reflecting a +4.3% shift over the same period.

Average household income in Saint Marys
$80,436/year
0.4% year-over-year change
Median household income in Saint Marys
$67,662/year
4.3% year-over-year change

Saint Marys income by age

In Saint Marys, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $88,971. Those with someone between 45 and 64 in charge, often well established professionally, earn $71,741 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $40,208, while those led by someone over 65, many of whom may be retired, have about $52,369 in earnings. Overall, 92.4% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $40,208 N/A
25 - 44 $88,971 9.2%
45 - 64 $71,741 2.1%
Over 65 $52,369 -4.8%
Above poverty level
11,453
Below poverty level
946
Value Percent YoY
change
Above poverty level 11,453 92.4% 0.5%
Below poverty level 946 7.6% -6.9%

Employment in Saint Marys

Workforce and job types in Saint Marys

58.9% of the working population are employed in professional or administrative positions, while 41.1% are in hands-on or service-based jobs. Also, 6.1% run their own businesses, 71.4% are employed by private companies, and 8.7% work in the public sector.

Workforce demographics

White collar
3,683
Blue collar
2,570
Value Percent YoY change
White collar 3,683 58.9% -1.1%
Blue collar 2,570 41.1% -0.1%
Employer type
Self employees
6.1%
Private companies
71.4%
Governmental workers
8.7%
Not for profit companies
13.7%
Value Percent YoY change
Self employees 384 6.1% -1.0%
Private companies 4,467 71.4% -1.3%
Governmental workers 545 8.7% 11.0%
Not for profit companies 857 13.7% -3.7%

Transportation in Saint Marys

How people get around in Saint Marys

Commuting methods vary: 98.4% of residents travel by personal vehicle and 1.2% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 5,832 98.4% 0.6%
Ferryboat 20 0.3% 0.0%
Walk 74 1.2% -38.8%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Saint Marys by zipcode?

Zipcode Population Number of households Median income Average income
15857 12,736 5,756 $67,662 $80,436

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FAQs about Saint Marys demographics 

What is the total population of Saint Marys?

Saint Marys has a total population of 12,736 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -0.7% compared to a year ago.

What is the gender ratio in Saint Marys?

The gender ratio in Saint Marys is as follows:
  • 49.2% males (6,262 residents)
  • 50.8% females (6,474 residents)

What is the median age in Saint Marys?

The median age in Saint Marys is 50.9.

What is the age distribution of the population in Saint Marys?

The age distribution in Saint Marys is as follows:
  • Under 15: 14.6% (1,858 residents)
  • Ages 15-24: 9.2% (1,172 residents)
  • Ages 25-44: 20.2% (2,573 residents)
  • Ages 45-64: 29.6% (3,774 residents)
  • Over 65: 26.4% (3,359 residents)

What is the racial and ethnic makeup of Saint Marys?

The racial and ethnic makeup of Saint Marys is as follows:
  • White: 94.8% (12,072 residents)
  • Black or African American: 1.3% (165 residents)
  • American Indian and Alaska Native: 0% ( residents)
  • Asian: 0.2% (20 residents)
  • Native Hawaiian and Other Pacific Islander: 0% ( residents)
  • Two or More Races: 3.5% (443 residents)
  • Other: 0.3% (36 residents)

What percentage of the population in Saint Marys are U.S.-born citizens?

U.S.-born citizens represent 97.8% of the population in Saint Marys.

How many housing units are there in Saint Marys?

There are 6,394 housing units in Saint Marys, reflecting a +2.0% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Saint Marys and what is the average household size?

Saint Marys has a total of 5,756 households, with an average of 2 people in each.

What is the median household income in Saint Marys?

Saint Marys has a median household income of $67,662, representing a +4.3% shift from the previous year, according to the U.S. Census Bureau.

What is the job market overview for Saint Marys?

Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 58.9% (3,683 residents)
  • Blue-collar workers: 41.1% (2,570 residents)

Places of employment:
  • Self-employed: 6.1% (384 residents)
  • Private companies: 71.4% (4,467 residents)
  • Governmental workers: 8.7% (545 residents)
  • Not-for-profit companies: 13.7% (857 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025