How many people live in Delaware County, PA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 584,900 people living in Delaware County, PA. That makes Delaware County the fifth-most populous county in Pennsylvania. It is home to 4.5% of people living in the state.
585K
population of Delaware County, PA (2024)
4.5%
County share of the Pennsylvania population (2024)
About 584,900 people lived in Delaware County, PA in 2024.
Population estimates, 2000–2024
What are Delaware County, PA’s age demographics?
About 107,200 Delaware County, PA residents are aged 65 and older in 2024. That represents 18.3% of its population. For comparison, the age group represents 20.4% of Pennsylvania’s population and 18% in the US overall.
Another 127,700 Delaware County residents, or 21.8% of the population, were children under 18. For comparison, the age group represents 20.1% of Pennsylvania’s population and 21.6% in the US overall.
A lower share of Delaware County, PA's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Delaware County, PA’s racial and ethnic demographics?
Non-Hispanic white residents make up 61.9% of the Delaware County, PA population, higher than the national share of 57.5%. Delaware County, PA also has a larger share of people identifying as non-Hispanic Black or African American (23.1%) than the US overall (12.6%).
In contrast, Delaware County’s Hispanic population accounts for 5.5%, below the 20% nationwide, and the non-Hispanic American Indian and Alaska Native population makes up 0.14% of the county, compared with 0.72% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Delaware County, PA has a higher share of a non-Hispanic Black or African American population than Pennsylvania as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Delaware County, PA is Upper Darby with about 86,000 residents in 2024.
Cities and towns in Delaware County, PA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Upper Darby | 86,045 |
| 2. | Haverford | 51,291 |
| 3. | Radnor | 34,130 |
| 4. | Chester | 34,052 |
| 5. | Ridley | 31,139 |
| 6. | Springfield | 25,206 |
| 7. | Marple | 24,423 |
| 8. | Concord | 18,450 |
| 9. | Middletown | 17,317 |
| 10. | Upper Chichester | 17,003 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
