Northumberland County's estimated 2026 population is 89,871 with a growth rate of -0.05% in the past year according to the most recent United States census data. Northumberland County is the 32nd largest county in Pennsylvania. The 2010 population was 94,287 and has seen a growth of -4.68% since that time.
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