15642 ZIP Code — Irwin, PA

Westmoreland County, Pennsylvania

ZIP code 15642 is located in Irwin, Pennsylvania, within Westmoreland County. It covers approximately 46.04 square miles and serves a population of 46,855 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 724.

About ZIP code 15642

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1960s, giving the area an established character. Median home value is $222,600. Owner-occupancy is high at 84%, well above the national average.

Median household income is $85,210. The poverty rate of 6% is below the national average. 37% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 30 minutes is near the national average.

Educational attainment is near the national average, with 40% of residents holding a bachelor's degree or higher.

Overall, ZIP code 15642 reflects a community defined by high homeownership and a significant Social Security-dependent population.

46,855

population

46.04

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

15642 ZIP code map

Cities in ZIP code 15642

Below are the cities the US Postal Service accepts for ZIP code 15642. Using any city not on this list may result in mail delivery delays.

City	Status
Irwin	Acceptable
Irwin	Preferred

Nearby ZIP codes

15647 Larimer (1.7 mi) 15678 Rillton (2.3 mi) 15692 Westmoreland City (2.5 mi) 15615 Ardara (3 mi) 15665 Manor (3.6 mi) 15637 Herminie (3.8 mi) 15611 Adamsburg (3.9 mi) 15131 Mckeesport (4.2 mi) 15135 Mckeesport (4.6 mi) 15085 Trafford (4.6 mi) 15675 Penn (4.7 mi) 15018 Buena Vista (4.8 mi)

Demographics updated 05/2026

Population
Total population	46,855
Population density	1,018 / sq mi
State FIPS	42
County FIPS	129

Geography
Land area	46.04 sq mi
Water area	0.12 sq mi
Latitude	40.3167
Longitude	-79.7242
Timezone	Eastern (ET)
Area code	724

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	32.5%	41.3%	39.8%
$50k – $100k	31.9%	32.3%	30.8%
$100k – $200k	28.6%	21.2%	22.4%
Over $200k	7.0%	5.1%	7.1%

Demographics & statistics

46,855

Population

1,018

People per sq mi

45.5

Median age

$85,210

Median household income

$44,209

Per capita income

$222,600

Median home value

$894

Median monthly rent

84.4%

Home ownership

6.4%

Poverty rate

4.6%

Unemployment

17,185

Housing units

39.8%

Bachelor's or higher

Age distribution

Male Female

1,077

Under 5

1,079

1,392

5–9

1,394

1,578

10–14

1,580

1,280

15–19

1,282

1,043

20–24

1,044

2,165

25–34

2,168

3,019

35–44

3,023

3,104

45–54

3,108

1,935

55–59

1,936

1,967

60–64

1,968

2,746

65–74

2,749

1,346

75–84

1,347

762

85+

763

← Male

Female →

Age summary

Group	Count	%
Under 18	9,877	21.1%
18 and over	36,978	78.9%
65 and over	9,713	20.7%
Median age	45.5 years

Race & ethnicity

White 93.3%

Two or more races 2.4%

Hispanic or Latino 1.3%

Asian 1.3%

Black or African American 1.2%

Other race 0.5%

Group	Count	%
White	44,301	93.3%
Two or more races	1,128	2.4%
Hispanic or Latino	622	1.3%
Asian	611	1.3%
Black or African American	556	1.2%
Other race	234	0.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	32.5%	41.3%	39.8%
$50k – $100k	31.9%	32.3%	30.8%
$100k – $200k	28.6%	21.2%	22.4%
Over $200k	7.0%	5.1%	7.1%

Under $10k 3.4%

$10k–$15k 2.3%

$15k–$25k 5.8%

$25k–$35k 6.1%

$35k–$50k 10.8%

$50k–$75k 13.9%

$75k–$100k 14.8%

$100k–$150k 19.5%

$150k–$200k 11.6%

$200k+ 11.9%

Range	% of households
Under $10k	3.4%
$10k–$15k	2.3%
$15k–$25k	5.8%
$25k–$35k	6.1%
$35k–$50k	10.8%
$50k–$75k	13.9%
$75k–$100k	14.8%
$100k–$150k	19.5%
$150k–$200k	11.6%
$200k+	11.9%
Median income	$85,210

Housing

Home values

Under $50k 2.5%

$50k–$100k 6.3%

$100k–$150k 11.0%

$150k–$200k 21.5%

$200k–$300k 28.3%

$300k–$500k 22.9%

$500k–$1M 7.2%

$1M+ 0.3%

Housing overview

Metric	Value
Median home value	$222,600
Median rent / month	$894
Owner occupied	84.4%
Renter occupied	15.6%
Vacant	4.6%
Single-family detached	85.7%
Large apartment buildings	3.0%
Mobile homes	1.6%
Median rooms	6.7
Avg household size (owned)	2.51

Year built

Era	%
2020 or later	0.3%
2010–2019	5.5%
2000–2009	8.3%
1990–1999	10.9%
1980–1989	6.8%
1970–1979	13.4%
1960–1969	19.0%
1950–1959	18.8%
1940–1949	5.2%
1939 or earlier	11.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.7%
1 bedroom	4.2%
2 bedrooms	16.8%
3 bedrooms	51.5%
4 bedrooms	23.1%
5+ bedrooms	3.7%

Vehicles per household

Vehicles	% of households
No vehicle	4.4%
1 vehicle	30.5%
2 vehicles	43.0%
3 or more	22.1%

Heating fuel

Fuel type	%
Utility gas	77.5%
Electricity	12.2%
Propane / LP gas	0.5%
Fuel oil	8.3%
Wood	0.7%
No fuel used	0.3%

Households & families

Household type	Count	%
Married-couple family	10,995	57.1%
Cohabiting couple	847	4.4%
Male householder, no spouse	2,879	14.9%
Female householder, no spouse	4,543	23.6%
Households with children under 18	5,496	28.5%
Households with seniors (65+)	6,836	35.5%
Average household size	2.42

Marital status

Status	Male	Female
Never married	27.0%	20.1%
Married	61.2%	56.2%
Separated	1.0%	1.1%
Widowed	3.3%	11.7%
Divorced	7.5%	10.8%

Education

Less than 9th grade 0.7%

Some HS, no diploma 1.7%

HS graduate 30.4%

Some college, no degree 14.9%

Associate's degree 12.4%

Bachelor's degree 26.4%

Graduate / professional 13.5%

Metric	%
HS diploma or higher	97.5%
Bachelor's or higher	39.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	645	6.4%
Kindergarten	468	4.7%
Elementary school	4,984	49.5%
High school	2,248	22.3%
College / grad school	1,717	17.1%

Employment

Industry of employment

Education & healthcare 25.6%

Manufacturing 13.4%

Retail trade 13.3%

Professional & management 11.8%

Finance & real estate 7.1%

Transportation & utilities 6.1%

Construction 5.7%

Arts, food & hospitality 4.8%

Other services 4.3%

Wholesale trade 2.9%

Public administration 2.6%

Information 1.8%

Agriculture & mining 0.5%

Occupation

Category	%
Management, business & arts	46.4%
Service	11.8%
Sales & office	21.6%
Natural resources & construction	7.7%
Production & transportation	12.5%

Employment type

Type	%
Private sector	85.2%
Government	10.2%
Self-employed	4.6%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	77.8%
Carpool	6.7%
Public transit	1.2%
Walk	0.5%
Work from home	13.2%
Other means	0.6%
Avg commute (minutes)	30.0

Poverty

All people 6.4%

Under 18 years 10.5%

18 and over 5.3%

Married-couple families 1.5%

Female-led households 22.3%

Income support

Source	% of households
Social Security	36.8%
Retirement income	30.1%
Supplemental Security	3.6%
Cash public assistance	2.4%
Food stamps / SNAP	7.8%

Health indicators

Condition	%
Obesity	34.0%
High blood pressure	32.1%
High cholesterol	34.8%
Diabetes	9.6%
Heart disease	6.5%
Stroke	2.7%
Asthma	9.5%
Arthritis	30.2%
Kidney disease	2.7%
Pulmonary disease	6.5%
Cancer	7.7%

Behavior / access	%
Smoking	15.7%
Binge drinking	19.3%
No physical activity	20.4%
Less than 7 hrs sleep	31.4%
Depression	21.4%
Fair or poor health	11.5%
Poor mental health	13.9%
Poor physical health	9.4%
No health insurance	7.9%
Visited doctor (checkup)	78.9%
Visited dentist	68.5%
Cholesterol screening	91.8%
Teeth loss	10.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	2,937	7.9%

Disability	%
Any disability	13.1%
Under 18	3.1%
18–64 years	11.1%
65 and over	29.1%

Health insurance coverage

Type	%
Private insurance	81.1%
Public insurance	32.1%
No insurance	2.3%
Uninsured under 19	0.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	44,699	95.4%
Spanish	269	0.6%
Other Indo-European	42	0.1%
Asian & Pacific Islander	139	0.3%
Other languages	88	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	46,029	98.2%
Born in same state	45,784	97.7%
Born in different state	41,001	87.5%
Foreign born	245	0.5%
Naturalized citizen	826	1.8%
Not a US citizen	618	74.8%

Ancestry

Ancestry	Count	%
Italian	8,433	18%
French	4,791	10.2%
Arab	1,981	4.2%
Irish	917	2%
English	208	0.4%

Ancestry	Count	%
Norwegian	102	0.2%
German	74	0.2%
Dutch	71	0.2%
Polish	63	0.1%

Technology access

Metric	% of households
Computer access	41.1%
Internet access	92.5%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 15642

What city is ZIP code 15642 in?

ZIP code 15642 is primarily assigned to Irwin, Pennsylvania.

What county is ZIP code 15642 in?

ZIP code 15642 falls within Westmoreland County, Pennsylvania.

Is ZIP code 15642 mostly owner-occupied?

84% of occupied units in ZIP code 15642 are owner-occupied, well above the national average.

Does ZIP code 15642 have a large retiree population?

37% of households in ZIP code 15642 receive Social Security income, suggesting a significant retiree or disability population.

What is the population of ZIP code 15642?

ZIP code 15642 has an estimated population of 46,855 residents, with a density of 1,018 people per square mile.

What is the typical home value in ZIP code 15642?

The median home value in ZIP code 15642 is $222,600.

What timezone is ZIP code 15642 in?

ZIP code 15642 observes the EST timezone.