15666 ZIP Code — Mount Pleasant, PA

Westmoreland County, Pennsylvania

ZIP code 15666 is located in Mount Pleasant, Pennsylvania, within Westmoreland County. It covers approximately 53.34 square miles and serves a population of 15,592 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 724.

About ZIP code 15666

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $148,500. Owner-occupancy is high at 79%, well above the national average.

Median household income is $62,295. 40% 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 25 minutes is near the national average.

Educational attainment is near the national average, with 22% of residents holding a bachelor's degree or higher.

Overall, ZIP code 15666 reflects a community defined by high homeownership and a significant Social Security-dependent population.

15,592

population

53.34

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

15666 ZIP code map

Cities in ZIP code 15666

Below are the cities the US Postal Service accepts for ZIP code 15666. Using any city not on this list may result in mail delivery delays.

City	Status
Mount Pleasant	Acceptable
Mount Pleasant	Preferred

Nearby ZIP codes

15610 Acme (3.7 mi) 15688 Tarrs (5.1 mi) 15612 Alverton (6.2 mi) 15639 Hunker (6.3 mi) 15490 White (6.3 mi) 15683 Scottdale (7 mi) 15628 Donegal (7.2 mi) 15697 Youngwood (7.8 mi) 15446 Indian Head (8.3 mi) 15679 Ruffs Dale (8.3 mi) 15462 Melcroft (8.7 mi) 15672 New Stanton (9.6 mi)

Demographics updated 05/2026

Population
Total population	15,592
Population density	292 / sq mi
State FIPS	42
County FIPS	129

Geography
Land area	53.34 sq mi
Water area	0.19 sq mi
Latitude	40.1580
Longitude	-79.4873
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	49.0%	41.3%	39.8%
$50k – $100k	32.0%	32.3%	30.8%
$100k – $200k	17.1%	21.2%	22.4%
Over $200k	1.9%	5.1%	7.1%

Demographics & statistics

15,592

Population

292

People per sq mi

49.6

Median age

$62,295

Median household income

$33,936

Per capita income

$148,500

Median home value

$773

Median monthly rent

78.8%

Home ownership

9.9%

Poverty rate

4.9%

Unemployment

6,167

Housing units

21.6%

Bachelor's or higher

Age distribution

Male Female

243

Under 5

263

319

5–9

346

479

10–14

520

390

15–19

424

347

20–24

377

615

25–34

668

945

35–44

1,024

1,090

45–54

1,182

670

55–59

727

596

60–64

647

1,125

65–74

1,220

395

75–84

429

264

85+

287

← Male

Female →

Age summary

Group	Count	%
Under 18	2,696	17.3%
18 and over	12,896	82.7%
65 and over	3,720	23.9%
Median age	49.6 years

Race & ethnicity

White 97.1%

Two or more races 1.3%

Hispanic or Latino 0.9%

Black or African American 0.7%

Asian 0.1%

Group	Count	%
White	15,276	97.1%
Two or more races	197	1.3%
Hispanic or Latino	142	0.9%
Black or African American	108	0.7%
Asian	11	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	49.0%	41.3%	39.8%
$50k – $100k	32.0%	32.3%	30.8%
$100k – $200k	17.1%	21.2%	22.4%
Over $200k	1.9%	5.1%	7.1%

Under $10k 5.9%

$10k–$15k 3.9%

$15k–$25k 9.1%

$25k–$35k 12.1%

$35k–$50k 10.7%

$50k–$75k 17.6%

$75k–$100k 15.2%

$100k–$150k 16.3%

$150k–$200k 7.0%

$200k+ 2.3%

Range	% of households
Under $10k	5.9%
$10k–$15k	3.9%
$15k–$25k	9.1%
$25k–$35k	12.1%
$35k–$50k	10.7%
$50k–$75k	17.6%
$75k–$100k	15.2%
$100k–$150k	16.3%
$150k–$200k	7.0%
$200k+	2.3%
Median income	$62,295

Housing

Home values

Under $50k 6.9%

$50k–$100k 19.9%

$100k–$150k 23.9%

$150k–$200k 17.8%

$200k–$300k 18.5%

$300k–$500k 10.7%

$500k–$1M 1.9%

$1M+ 0.4%

Housing overview

Metric	Value
Median home value	$148,500
Median rent / month	$773
Owner occupied	78.8%
Renter occupied	21.2%
Vacant	8.0%
Single-family detached	77.0%
Large apartment buildings	1.2%
Mobile homes	8.4%
Median rooms	5.9
Avg household size (owned)	2.31

Year built

Era	%
2020 or later	0.6%
2010–2019	3.1%
2000–2009	6.6%
1990–1999	5.7%
1980–1989	12.6%
1970–1979	10.7%
1960–1969	11.3%
1950–1959	16.8%
1940–1949	8.5%
1939 or earlier	24.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.8%
1 bedroom	6.2%
2 bedrooms	32.3%
3 bedrooms	46.3%
4 bedrooms	12.9%
5+ bedrooms	1.5%

Vehicles per household

Vehicles	% of households
No vehicle	7.5%
1 vehicle	28.8%
2 vehicles	42.4%
3 or more	21.4%

Heating fuel

Fuel type	%
Utility gas	35.4%
Electricity	20.3%
Propane / LP gas	5.9%
Fuel oil	35.2%
Wood	1.6%
Solar	0.2%
No fuel used	1.0%

Households & families

Household type	Count	%
Married-couple family	3,300	46.8%
Cohabiting couple	358	5.1%
Male householder, no spouse	1,464	20.8%
Female householder, no spouse	1,924	27.3%
Households with children under 18	1,562	22.2%
Households with seniors (65+)	2,598	36.9%
Average household size	2.19

Marital status

Status	Male	Female
Never married	29.1%	24.7%
Married	53.1%	48.8%
Separated	1.9%	2.7%
Widowed	4.5%	12.3%
Divorced	11.4%	11.5%

Education

Less than 9th grade 1.0%

Some HS, no diploma 3.9%

HS graduate 42.5%

Some college, no degree 17.8%

Associate's degree 13.3%

Bachelor's degree 14.8%

Graduate / professional 6.7%

Metric	%
HS diploma or higher	95.2%
Bachelor's or higher	21.6%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	84	2.9%
Kindergarten	147	5.2%
Elementary school	1,356	47.5%
High school	695	24.4%
College / grad school	572	20.0%

Employment

Industry of employment

Education & healthcare 21.9%

Manufacturing 14.1%

Retail trade 12.6%

Transportation & utilities 9.7%

Arts, food & hospitality 8.8%

Other services 7.1%

Professional & management 6.9%

Construction 6.5%

Wholesale trade 4.7%

Public administration 3.3%

Finance & real estate 2.8%

Agriculture & mining 1.0%

Information 0.5%

Occupation

Category	%
Management, business & arts	30.1%
Service	16.9%
Sales & office	20.7%
Natural resources & construction	12.3%
Production & transportation	20.0%

Employment type

Type	%
Private sector	85.0%
Government	9.5%
Self-employed	5.2%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	85.2%
Carpool	5.6%
Public transit	0.1%
Walk	1.3%
Work from home	7.2%
Other means	0.6%
Avg commute (minutes)	25.2

Poverty

All people 9.9%

Under 18 years 9.7%

18 and over 9.9%

Married-couple families 2.3%

Female-led households 18.4%

Income support

Source	% of households
Social Security	39.5%
Retirement income	27.8%
Supplemental Security	3.9%
Cash public assistance	1.9%
Food stamps / SNAP	11.3%

Health indicators

Condition	%
Obesity	35.8%
High blood pressure	35.7%
High cholesterol	35.9%
Diabetes	11.5%
Heart disease	8.1%
Stroke	3.6%
Asthma	10.1%
Arthritis	33.4%
Kidney disease	3.3%
Pulmonary disease	8.6%
Cancer	8.1%

Behavior / access	%
Smoking	19.4%
Binge drinking	18.2%
No physical activity	25.1%
Less than 7 hrs sleep	33.2%
Depression	22.3%
Fair or poor health	15.2%
Poor mental health	15.0%
Poor physical health	11.5%
No health insurance	9.8%
Visited doctor (checkup)	79.3%
Visited dentist	62.4%
Cholesterol screening	90.5%
Teeth loss	15.1%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,046	8.1%

Disability	%
Any disability	15.7%
Under 18	5.1%
18–64 years	12.7%
65 and over	31.3%

Health insurance coverage

Type	%
Private insurance	73.4%
Public insurance	41.1%
No insurance	3.6%
Uninsured under 19	1.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	15,086	96.8%
Spanish	37	0.2%
Other Indo-European	11	0.1%
Asian & Pacific Islander	15	0.1%
Other languages	11	0.1%

Place of birth & citizenship

Origin	Count	%
Native born (US)	15,509	99.5%
Born in same state	15,474	99.2%
Born in different state	14,077	90.3%
Foreign born	35	0.2%
Naturalized citizen	83	0.5%
Not a US citizen	58	69.9%

Ancestry

Ancestry	Count	%
Italian	2,452	15.7%
French	1,062	6.8%
Arab	916	5.9%
English	254	1.6%

Ancestry	Count	%
Irish	244	1.6%
Polish	61	0.4%
Norwegian	44	0.3%
Dutch	18	0.1%

Technology access

Metric	% of households
Computer access	45.2%
Internet access	86.9%

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

Frequently asked questions about ZIP code 15666

What city is ZIP code 15666 in?

ZIP code 15666 is primarily assigned to Mount Pleasant, Pennsylvania.

What county is ZIP code 15666 in?

ZIP code 15666 falls within Westmoreland County, Pennsylvania.

Does ZIP code 15666 have a large retiree population?

40% of households in ZIP code 15666 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 15666?

The median home value in ZIP code 15666 is $148,500.

What is the population of ZIP code 15666?

ZIP code 15666 has an estimated population of 15,592 residents, with a density of 292 people per square mile.

What is the median household income in ZIP code 15666?

The median household income in ZIP code 15666 is $62,295, below the national median of ~$75,000.

What timezone is ZIP code 15666 in?

ZIP code 15666 observes the EST timezone.