Borough in Westmoreland County, Pennsylvania · 0.8 sq mi · 4,465 people per sq mi
3,736 people live in Irwin. The typical household earns $59,963, and the median resident is 38.1 years old.
2026 projection
From 3,902 in 2020
Poverty rate 13.49%
Men 34.9 · Women 38.5
1820–2026
3,736
2026 projection
4.3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1820–2026
3,736
2026 projection
4.3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 3,736 | -23 | 0.61% |
|---|---|---|---|
| 2025 | 3,759 | -24 | 0.63% |
| 2024 | 3,783 | -17 | 0.45% |
| 2023 | 3,800 | -19 | 0.50% |
| 2022 | 3,819 | -34 | 0.88% |
| 2021 | 3,853 | -49 | 1.26% |
| 2020 | 3,902 | -9 | 0.23% |
| 2019 | 3,911 | -8 | 0.20% |
| 2018 | 3,919 | -8 | 0.20% |
| 2017 | 3,927 | -18 | 0.46% |
Showing 10 of 32 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Irwin has a population change lower than Westmoreland County, Pennsylvania, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 38 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 7 residents
36% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 36% | 49% | 28% |
| Never married | 41% | 36% | 43% |
| Divorced | 16% | 14% | 17% |
| Widowed | 8% | 2% | 12% |
| Separated | 0% | 0% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources