Westmoreland County's 2026 population is estimated at 349,965, reflecting a -0.14% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Westmoreland County is the 11th largest county in Pennsylvania. The 2010 population was 365,029 and has grown -4.13% since 2010.
Data after 2023 is projected based on recent change
Overall: 47.2 years
Female: 48.8 years
Male: 45.5 years
There are 288,350 adults, (85,642 of whom are seniors) in Westmoreland County.
Female: 178,407 (50.6%)
Male: 174,093 (49.4%)
The racial composition of Westmoreland County includes 91.83% White, and smaller percentages for Black or African American, Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 323,709 | 91.83% |
| Two or more races | 14,267 | 4.05% |
| Black or African American | 9,148 | 2.6% |
| Asian | 3,406 | 0.97% |
| Other race | 1,600 | 0.45% |
| Native American | 295 | 0.08% |
| Native Hawaiian or Pacific Islander | 75 | 0.02% |
Westmoreland County 's average per capita income is $52,442. Household income levels show a median of $74,109. The poverty rate stands at 10.27%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $110,777 | $134,935 |
| Families | $97,102 | $120,393 |
| Households | $74,109 | $97,695 |
| Non Families | $40,532 | $56,433 |
Average Income
Median Household Income
Poverty Rate