Zip Code 15642
Irwin, Pennsylvania — Westmoreland County
📍 ZIP code 15642 is in Irwin, Westmoreland County, Pennsylvania.
ZIP code 15642 is located in Irwin, Westmoreland County, Pennsylvania. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 46,727. The area code for ZIP code 15642 is 814.
Quick Answer
Zip code 15642 is in Irwin, Pennsylvania (Westmoreland County). It has a population of 46,727, median household income of $92,975, and median home value of $236,000.
Population
46,727
Income
$92,975
Home Value
$236,000
Climate
86°F / 22°F
About Zip Code 15642
Zip code 15642 is located in Irwin, Pennsylvania, within Westmoreland County. Home to approximately 46,727 residents, this area sits at an elevation of 1137 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 814.
The median household income is $92,975 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $236,000, and the cost of living index is 93 (7% below the national average of 100).
Summers average a high of 86°F while winters drop to 22°F. The area receives about 44 in of rain and 25 in of snow annually. The zip code covers 44.3 square miles of land area and 0.1 square miles of water.
Key Statistics
46,727
$92,975
$236,000
Eastern (EST/EDT)
814
1137 ft
44.3 sq mi
44.9
20,299
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Compare With Nearby Zip Codes
Cost of Living
100 = National Average. Irwin's cost of living is 7% below the national average.
vs. State Avg
Below
Affordability
Affordable
Income-to-Home
2.5x
Demographics
Zip code 15642 has a population of 46,727 people with a median age of 44.9. There are 20,299 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Irwin (15642) population trend from 2010 to 2024
↑ 26.9%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
86°F
22°F
44 in
25 in
Irwin experiences warm summers with average highs around 86°F. Winters are cool with lows averaging 22°F. The area receives about 25 in of snow per year.
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Housing & Economy
Median Home Value
$236,000
Median Household Income
$92,975
With 20,299 housing units across 44.3 square miles, 15642 has a housing density of 458 units per square mile. The home price-to-income ratio is 2.5x.
Location & Geography
Latitude
40.3193°
Longitude
-79.7237°
Land Area
44.3 sq mi
Water Area
0.1 sq mi
Nearby Zip Codes
Zip codes closest to 15642 (Irwin, PA) with distances:
All Zip Codes in Irwin, PA
Other zip codes serving Irwin:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 15642's $92,975. A way to compare Irwin to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 15642 (Irwin, PA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Irwin, Pennsylvania?
Irwin, Pennsylvania uses zip code 15642 along with 2 other zip codes.
What county is zip code 15642 in?
Zip code 15642 is located in Westmoreland County, Pennsylvania.
What is the population of zip code 15642?
The population of zip code 15642 is 46,727 with a median age of 44.9.
Is 15642 in Irwin, Pennsylvania?
Yes, zip code 15642 is in Irwin, Westmoreland County, Pennsylvania. The area code is 814.
Frequently Asked Questions
What city is zip code 15642 in?
Zip code 15642 is in Irwin, Pennsylvania. It is part of Westmoreland County and uses the Eastern (EST/EDT) timezone.
What is zip code 15642?
Zip code 15642 is a U.S. postal code in Irwin, Pennsylvania (Westmoreland County). It has a population of 46,727 and covers 44.3 square miles.
What is the population of zip code 15642?
The population of zip code 15642 (Irwin, PA) is 46,727 with a median age of 44.9. There are approximately 20,299 housing units in this area.
What is the median income in zip code 15642?
The median household income in zip code 15642 (Irwin, PA) is $92,975 per year. The cost of living index is 93 (100 = national average).
What is the average home price in zip code 15642?
The median home value in zip code 15642 (Irwin, PA) is $236,000. The cost of living index is 93 compared to the national average of 100.
What county is zip code 15642 in?
Zip code 15642 is located in Westmoreland County, Pennsylvania. The primary city is Irwin.
What is the area code for zip code 15642?
Zip code 15642 in Irwin, PA uses area code 814. It is located in the Eastern (EST/EDT) timezone.
Is zip code 15642 a good place to live?
Zip code 15642 (Irwin, PA) has a cost of living index of 93 (100 = national average), a median household income of $92,975, and median home values of $236,000. The median age is 44.9. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 15642?
The cost of living index for zip code 15642 (Irwin, PA) is 93, where 100 represents the national average. This area is below the national average. Median home value: $236,000.
What schools serve zip code 15642?
Zip code 15642 in Irwin, Pennsylvania is served by the local school district of Westmoreland County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.