Delaware County's 2026 population is estimated at 593,570, reflecting a 0.74% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Delaware County is the 5th largest county in Pennsylvania. The 2010 population was 559,009 and has grown 6.18% since 2010.
Data after 2023 is projected based on recent change
Overall: 39.1 years
Female: 40.2 years
Male: 37.9 years
There are 451,639 adults, (100,966 of whom are seniors) in Delaware County.
Female: 298,623 (51.6%)
Male: 280,599 (48.4%)
The racial composition of Delaware County includes 63.23% White, 22.15% Black or African American, 6.33% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 366,265 | 63.23% |
| Black or African American | 128,315 | 22.15% |
| Asian | 36,677 | 6.33% |
| Two or more races | 33,027 | 5.7% |
| Other race | 14,217 | 2.45% |
| Native American | 417 | 0.07% |
| Native Hawaiian or Pacific Islander | 304 | 0.05% |
Delaware County 's average per capita income is $58,678. Household income levels show a median of $89,546. The poverty rate stands at 10.17%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $146,168 | $189,461 |
| Families | $116,982 | $157,130 |
| Households | $89,546 | $128,465 |
| Non Families | $49,936 | $71,141 |
Average Income
Median Household Income
Poverty Rate