Northumberland County's 2026 population is estimated at 89,819, reflecting a -0.12% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Northumberland County is the 32nd largest county in Pennsylvania. The 2010 population was 94,287 and has grown -4.74% since 2010.
Data after 2023 is projected based on recent change
Overall: 44.5 years
Female: 46.2 years
Male: 43.1 years
There are 72,741 adults, (20,204 of whom are seniors) in Northumberland County.
Female: 44,413 (49%)
Male: 46,147 (51%)
The racial composition of Northumberland County includes 89.87% White, and smaller percentages for Black or African American, other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 81,389 | 89.87% |
| Two or more races | 4,099 | 4.53% |
| Black or African American | 2,372 | 2.62% |
| Other race | 2,227 | 2.46% |
| Asian | 382 | 0.42% |
| Native American | 91 | 0.1% |
Northumberland County 's average per capita income is $45,127. Household income levels show a median of $60,583. The poverty rate stands at 12.59%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $93,513 | $107,616 |
| Families | $79,545 | $94,979 |
| Households | $60,583 | $78,529 |
| Non Families | $34,216 | $47,170 |
Average Income
Median Household Income
Poverty Rate