St. Clair, Westmoreland County, PA demographics:
population, income, and more

Total population
2,791
-0.0% year-over-year change
Median household income
$64,304/yr
5.6% year-over-year change
Housing units
1,720
3.4% year-over-year change

St. Clair population

How many people live in St. Clair

St. Clair is home to 2,791 residents, according to the most recent Census data. Gender-wise, 49% of St. Clair locals are male, and 51% are female.

Total population
2,791
-0.0% year-over-year change
Gender ratio
Male
49%
1,368
Female
51%
1,423
Value Percent YoY change
Male 1,368 49% 1.3%
Female 1,423 51% -1.2%
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 St. Clair is 39, with the population distributed as follows: about 12.2% are children under 15, then 14.8% are in the 15 to 24 age group. Adults between 25 and 44 make up 22.4% of the population, while another 28.6% fall into the 45 to 64 bracket. Finally, around 22% are 65 or older.

Median age
39
Age breakdown
Under 15
12.2%
15 to 24
14.8%
25 to 44
22.4%
45 to 64
28.6%
Over 65
22%
Value Percent YoY change
Under 15 342 12.2% 11.0%
15 to 24 412 14.8% -2.4%
25 to 44 624 22.4% -8.5%
45 to 64 798 28.6% 0.5%
Over 65 615 22% 5.0%
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 St. Clair, 98.2% of the population are US-born citizens, while 1.8% have gained naturalized citizenship. There’s also a share of 7.1% that includes residents with two or more races.

Citizenship
U.S.-born citizens
98.2%
Non-U.S.-born citizens
1.8%
Non-citizens
0%
Value Percent YoY change
U.S.-born citizens 2,741 98.2% 0.0%
Non-U.S.-born citizens 50 1.8% -3.9%
Racial breakdown
White
92.2%
Black or African American
0%
American Indian and Alaska Native
0%
Asian
0%
Native Hawaiian and other Pacific Islander
0%
Two or more races
7.1%
Other
0.8%
Value Percent
White 2,572 92.2%
Black or African American 1 0%
Two or more races 197 7.1%
Other 21 0.8%

Households in St. Clair

A peek inside St. Clair households

St. Clair has 1,362 households, with an average of 2 members in each. Of these, 47.9% are families, while the remaining 52.1% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
1,362
1.9% year-over-year change
Average people per household
2
Non-family households
709
Family households
653
Value Percent YoY change
Non-family households 709 52.1% 3.4%
Family households 653 47.9% 0.3%
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 St. Clair

The housing landscape of St. Clair

St. Clair's housing consists of 1,720 units, with 51.7% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 29% 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 0.9% of the housing landscape.

Housing units
1,720
3.4% year-over-year change
Housing types
Value Percent
1 unit, detached 889 51.7%
1 unit, attached 498 29%
2 units 44 2.6%
3 or 4 units 193 11.2%
5 to 9 units 30 1.7%
20 to 49 units 51 3%
Mobile home 15 0.9%
Homes built since 2020
% year-over-year change

The age of buildings in St. Clair

In St. Clair, the median construction year is 1939. About 71.2% of homes were built before the 1940s, with another 3.8% going up by 1949. Most development happened in the second half of the 20th century.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,224 71.2% 2.9%
Built between 1940 and 1949 65 3.8% -31.6%
Built between 1950 and 1959 84 4.9% -25.0%
Built between 1960 and 1969 98 5.7% 13.9%
Built between 1970 and 1979 38 2.2% -26.9%
Built between 1980 and 1989 102 5.9% 54.5%
Built between 1990 and 1999 61 3.6% 35.6%
Built between 2000 and 2009 30 1.7% 66.7%
Built between 2010 and 2019 18 1% N/A
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.

St. Clair occupancy rates

Out of the 1,362 occupied housing units in St. Clair, 73.8% are owner-occupied, while 26.2% are lived in by tenants. Meanwhile, 20.8% of all homes on the local market sit vacant.

Occupied housing units
1,362
1.9% year-over-year change
Occupancy breakdown
Renter occupied
357
Owner occupied
1,005
Value Percent YoY
change
Renter occupied 357 26.2% 10.2%
Owner occupied 1,005 73.8% -0.8%
Unoccupied housing units
20.8%
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.

St. Clair housing costs

Housing costs in St. Clair come to a median of $758 per month, while tenants specifically pay a median gross rent of $1,064.

Median housing costs per month
$758/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 St. Clair
$1,064/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 St. Clair

St. Clair education at a glance

About 57.5% of the population in St. Clair went to high school, while 14.4% pursued college studies. Another 10.6% earned an associate degree and 14.8% hold a bachelor’s. Meanwhile, 2.2% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 13 0.6% -75.0%
High school diploma 1,363 57.5% -2.5%
College diploma 340 14.4% 3.7%
Associate degree 252 10.6% 11.5%
Bachelor's degree 351 14.8% 10.4%
Graduate degree 51 2.2% -26.1%
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 St. Clair

How much people earn in St. Clair

The average annual household income in St. Clair was $60,192 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a -6.8% change from the previous year. At the same time, the median income stood at $64,304, reflecting a +5.6% shift over the same period.

Average household income in St. Clair
$60,192/year
-6.8% year-over-year change
Median household income in St. Clair
$64,304/year
5.6% year-over-year change

St. Clair income by age

In St. Clair, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $46,978. Those with someone between 45 and 64 in charge, often well established professionally, earn $69,543 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $93,449, while those led by someone over 65, many of whom may be retired, have about $33,125 in earnings. Overall, 91.6% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $93,449 2.7%
25 - 44 $46,978 -28.4%
45 - 64 $69,543 9.1%
Over 65 $33,125 7.0%
Above poverty level
2,555
Below poverty level
235
Value Percent YoY
change
Above poverty level 2,555 91.6% 4.8%
Below poverty level 235 8.4% -33.4%

Average renter income in St. Clair

To get a better sense of what renters earn on average in St. Clair, their median household income was $38,438 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 33.2%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$38,438
Rent-to-income ratio
33.2%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in St. Clair

Workforce and job types in St. Clair

The job market in St. Clair is powered by 1,582 working residents, spread across a range of industries and roles. 64.4% of the working population are employed in professional or administrative positions, while 35.6% are in hands-on or service-based jobs. Also, 3.9% run their own businesses, 81.4% are employed by private companies, and 9.7% work in the public sector.

Workforce demographics

Working population
1,582
1.9% year-over-year change
White collar
1,018
Blue collar
564
Value Percent YoY change
White collar 1,018 64.4% 3.9%
Blue collar 564 35.6% -1.4%
Employer type
Self employees
3.9%
Private companies
81.4%
Governmental workers
9.7%
Not for profit companies
4.9%
Value Percent YoY change
Self employees 62 3.9% -16.2%
Private companies 1,288 81.4% 7.1%
Governmental workers 154 9.7% -18.5%
Not for profit companies 78 4.9% -9.3%
Unemployment rate
1.5%
41.2% year-over-year change

Available workforce

The unemployment rate in St. Clair stands at 1.5%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in St. Clair

How people get around in St. Clair

In St. Clair, the average commute time is 23 minutes. Commuting methods vary: 91.4% of residents travel by personal vehicle and 6.2% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
23 min
27.8% year-over-year change
Means of transportation
Value Percent YoY change
Car 1,337 91.4% 5.4%
Bus or trolleybus 35 2.4% 0.0%
Walk 91 6.2% -26.6%
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 St. Clair by zipcode?

Zipcode Population Number of households Median income Average income
15944 3,063 1,220 $69,076 $89,806
15954 2,279 1,121 $43,958 $56,463

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FAQs about St. Clair demographics 

What is the total population of St. Clair?

St. Clair has a total population of 2,791 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 -0.0% compared to a year ago.

What is the gender ratio in St. Clair?

The gender ratio in St. Clair is as follows:
  • 49% males (1,368 residents)
  • 51% females (1,423 residents)

What is the median age in St. Clair?

The median age in St. Clair is 39.

What is the age distribution of the population in St. Clair?

The age distribution in St. Clair is as follows:
  • Under 15: 12.2% (342 residents)
  • Ages 15-24: 14.8% (412 residents)
  • Ages 25-44: 22.4% (624 residents)
  • Ages 45-64: 28.6% (798 residents)
  • Over 65: 22% (615 residents)

What is the racial and ethnic makeup of St. Clair?

The racial and ethnic makeup of St. Clair is as follows:
  • White: 92.2% (2,572 residents)
  • Black or African American: 0% (1 residents)
  • American Indian and Alaska Native: 0% ( residents)
  • Asian: 0% ( residents)
  • Native Hawaiian and Other Pacific Islander: 0% ( residents)
  • Two or More Races: 7.1% (197 residents)
  • Other: 0.8% (21 residents)

What percentage of the population in St. Clair are U.S.-born citizens?

U.S.-born citizens represent 98.2% of the population in St. Clair.

How many housing units are there in St. Clair?

There are 1,720 housing units in St. Clair, reflecting a +3.4% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in St. Clair and what is the average household size?

St. Clair has a total of 1,362 households, with an average of 2 people in each.

What is the median household income in St. Clair?

St. Clair has a median household income of $64,304, representing a +5.6% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for St. Clair?

The employment rate is 98.5% in St. Clair, with a workforce of 1,582 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 64.4% (1,018 residents)
  • Blue-collar workers: 35.6% (564 residents)

Places of employment:
  • Self-employed: 3.9% (62 residents)
  • Private companies: 81.4% (1,288 residents)
  • Governmental workers: 9.7% (154 residents)
  • Not-for-profit companies: 4.9% (78 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