Residential delivery area · Pennsylvania
ZIP Code 15642: Irwin, PA
ZIP code 15642 uses the postal name Irwin, Pennsylvania and lies mostly in Westmoreland County (98% of its land) with the rest in Allegheny County (Census 2020 ZIP-county file). About 46,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $97,706 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Irwin (2%) and North Irwin (under 1%), and 4% in smaller places; 94% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Irwin · its only residential ZIP
- County
- Westmoreland County (98%); Allegheny County (2%)
- Census places
- Irwin (2%); North Irwin (under 1%)
- Metro area
- Pittsburgh, PA
- House district
- PA-12 119th Congress
- State
- Pennsylvania
- Time zone
- Eastern
- Land area
- 46.0 sq mi · 1,006 people per sq mi
Where is ZIP code 15642?
15642 centers on 40.319°, -79.724° and covers 46.0 square miles of land plus 0.1 of water. It borders 12 ZIP codes: 15647, 15678, 15692, 15691, 15615, 15665, 15611, 15131, 15637, 15625 and more.
The map draws ZIP code areas only. For the streets inside 15642, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 15642 compare with the rest of Westmoreland County?
| Measure | 15642 | In Westmoreland County | In PA |
|---|---|---|---|
| People (ACS 2020-2024) | 46,325 | 2nd of 87 | 28th of 1,833 |
| Median household income | $98k | 3rd of 37 | 204th of 1,015 |
| Median home value | $244k | 5th of 37 | 417th of 1,069 |
Its median household income is higher than in 79% of U.S. residential ZIP codes, and it is denser than 78% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 15642?
The 2020 Census counted 46,461 people in 15642; the ACS, which samples households over 2020-2024, estimates 46,325. Between the 2010 and 2020 censuses its population grew 2.6% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 46,325
- 2020 Census count
- 46,461+2.6% since 2010 (45,286)
- Households
- 19,251
- Median age
- 45.0
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 15642?
Of the 46,325 people the ACS estimates in 15642, 21.1% are under 18 and 20.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (93.4%).
- Under 1821.1%
- 18 to 6458.1%
- 65 and older20.8%
- White, not Hispanic93.4%
- Other or two or more3.6%
- Hispanic or Latino1.5%
- Asian, not Hispanic0.9%
- Black, not Hispanic0.6%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 15642 earn?
Median household income is $97,706 (ACS 2020-2024), the 3rd highest of the 37 ranked ZIP codes in Westmoreland County. It is not measurably different from 2015-2019 ($91,720 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $97,706
- Income per person
- $49,889
- Below the poverty line
- 5.7%
- Unemployed (of the labor force)
- 4.5%
- Adults 25+ with a bachelor's degree
- 42.1%
- Adjusted gross income per tax return, 2022
- $90,03424,080 returns; wages 70% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 15642?
FHFA's house price index for 15642, built from repeat sales and appraisals of the same homes, rose 67% from 2015 to 2025 and rose 46% from 2020 to 2025, and moved +7.1% in 2025.
- Median home value (owners' estimate)
- $243,800
- Median gross rent
- $1,008
- Homes owned by their occupants
- 85.2%
- Housing units
- 20,192
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 15642?
995 business establishments had a location in this ZIP code in 2023, 33 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction140
- Health care and social assistance137
- Retail trade118
- Other services (except public administration)110
- Professional, scientific, and technical services97
- Accommodation and food services79
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 15642?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 15647 | Larimer | 49 | – | 1.6 mi |
| 15678 | Rillton | 472 | $66k | 2.4 mi |
| 15692 | Westmoreland City | 992 | $72k | 2.5 mi |
| 15691 | Wendel | 302 | $168k | 2.6 mi |
| 15615 | Ardara | 148 | $89k | 2.9 mi |
| 15665 | Manor | 1,339 | $82k | 3.5 mi |
| 15611 | Adamsburg | 241 | $64k | 3.8 mi |
| 15131 | McKeesport | 8,209 | $62k | 4.0 mi |
| 15637 | Herminie | 1,821 | $71k | 4.1 mi |
| 15625 | Darragh | 58 | – | 4.1 mi |
| 15028 | Coulters | 128 | $49k | 4.3 mi |
| 15085 | Trafford | 8,062 | $83k | 4.5 mi |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.