ZIP code · Irwin · Pennsylvania · United States
ZIP code 15642 — Irwin
ZIP code 15642 serves Irwin, Pennsylvania.
- Postal code
- 15642Single source Value from one source, not cross-checked.
- City
- Irwin
- County
- Westmoreland FIPS 42129
- State
- Pennsylvania
- Country
- United States
- Coordinates
- 40.3191, -79.7205 — precision precise (locality)
View on OpenStreetMap - Population
- 46,727 (ZCTA, ACS 5-year)
- Population density
- 1,015 / sq mi
- Land area
- 46 sq mi (119.2 km²) (ZCTA, ACS 5-year)
- Median household income
- $92,975
- Per-capita income
- $47,909
- Median age
- 44.9
- Households
- 19,426
- Housing units
- 20,299
- Median home value
- $236,000
- Median gross rent
- $960 / month
- Congressional district
- PA-12 (119th Congress)
- USDA hardiness zone
- 6b (-5 to 0 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
Tools: compare 15642 with another ZIP · ZIPs within 25 miles · distance from 15642
Map of ZIP code 15642
Climate — monthly normals
Warmest month Jul (avg high 86°F), coldest Jan (avg low 22°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 38 | 41 | 50 | 64 | 74 | 83 | 86 | 84 | 77 | 65 | 52 | 41 |
| Avg low °F | 22 | 22 | 29 | 39 | 51 | 59 | 64 | 62 | 55 | 43 | 33 | 27 |
| Precip in | 3.2 | 2.8 | 3.3 | 3.8 | 4.1 | 4.6 | 4.8 | 4.2 | 3.4 | 3.4 | 2.9 | 3.2 |
NOAA 1991–2020 climate normals from the nearest station: MURRYSVILLE 2 SW (6.4 mi) · NOAA NCEI
Places in ZIP 15642
- 21 schools
- 1 hospitals & clinics
- 3 doctors & dentists
- 5 pharmacies
- 4 supermarkets
- 37 restaurants & cafés
- 1 bars & pubs
- 22 parks
- 14 playgrounds
- 7 gyms & sports centres
- 1 libraries
- 4 post offices
- 34 places of worship
- 12 banks
- 9 gas stations
- 2 EV charging stations
- 9 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page