Irwin Borough is a borough in Westmoreland County, Pennsylvania, home to about 3,831 people across 0.8 square miles. It has no ZIP code of its own: it’s part of 15642.
Homes sold for a median of $197 per square foot in the three months ending August 2026, a seller’s market.
Mostly North Huntingdon; part is in Irwin Borough
Each card is that ZIP code’s whole market, including any part outside Irwin Borough. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Irwin Borough’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Irwin Borough well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Pittsburgh International Airport (PIT)29 miles away |
|---|---|
| Closer regional airport | Arnold Palmer Regional Airport (LBE)17 miles away |
| Nearest city of 250,000+ | Pittsburgh, PA16 miles away |
| Nearest city of 1 million+ | Philadelphia, PA243 miles away |
Straight-line distances from the center of Irwin Borough; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Irwin Borough had 3,902 residents in the 2020 census, down 11% since 2000.
It’s the 746th largest of 2,568 towns in Pennsylvania by population.
Westmoreland County grew from 160,175 residents in 1900 to 354,663 in 2020.
Westmoreland County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 22°F. About 43.7 inches of rain and melted snow fall in a typical year, with about 25 inches of snow.
Source: NOAA 1991–2020 climate normals, Murrysville 2 Sw, PA weather station (6 miles away).
124,843 jobs at 8,428 businesses in Westmoreland County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
348 doctors and other health care providers list an office in Irwin Borough.
Nearest hospitals
Providers with an office here
| Primary care doctors | 40 |
|---|---|
| Specialist doctors | 28 |
| Dentists | 24 |
| Nurse practitioners and physician assistants | 60 |
| Mental health providers | 118 |
| Physical and occupational therapists | 41 |
| Optometrists | 12 |
| Chiropractors | 25 |
| Pharmacies | 11 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (4 nearby)
Grocery stores
Pharmacies
Libraries
Museums
Theaters and performance venues
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Hempfield Area SD, Norwin SD, Penn-Trafford SD. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| West Hempfield El SchIrwin | Pre-K–5 | 496 | Public | 2.6 mi |
| Hahntown El SchNorth Huntingdon | K–4 | 419 | Public | 0.2 mi |
| Sheridan Terrace El SchNorth Huntingdon | K–4 | 417 | Public | 1.6 mi |
| Stewartsville El SchNorth Huntingdon | K–4 | 422 | Public | 3.0 mi |
| Sunrise El SchIrwin | K–5 | 412 | Public | 3.6 mi |
| Sunset Valley El SchNorth Huntingdon | K–4 | 448 | Public | 1.5 mi |
| Hillcrest Intermediate SchNorth Huntingdon | 5–6 | 755 | Public | 0.5 mi |
| West Hempfield MSIrwin | 6–8 | 546 | Public | 3.0 mi |
| Norwin MSNorth Huntingdon | 7–8 | 819 | Public | 0.3 mi |
| Norwin HSNorth Huntingdon | 9–12 | 1,671 | Public | 0.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Calvary Preschool CenterIrwin | Pre-K–K | 14 | Assembly of God | 2.0 mi |
| Queen of Angels Catholic SchoolNorth Huntingdon | Pre-K–8 | 179 | Roman Catholic | 0.7 mi |
| Adelphoi Education @ Hartford HeightsNorth Huntingdon | K–12 | 55 | Nonsectarian | 3.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with North Huntingdon, Penn Township (Westmoreland County), Hempfield, Sewickley Township, Manor Borough and North Irwin.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.