Delaware County, Pennsylvania Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 5th-largest in Pennsylvania
The population of Delaware County, Pennsylvania is 576,195 as of the 2023 American Community Survey, making it the 5th-largest county in Pennsylvania. The median household income is $88,576, the median home value is $302,400, and the median age is 39.0.
The population of Delaware County has grown 4.6% since 2010 (559,009 → 584,882), a +0.32% annualized rate.
576,195
Population
+0.32%
Annual growth
3135
People / sq mi
$88,576
Median Income
$302,400
Median Home Value
Delaware County covers 184 sq mi of land at 3134.8 people per square mile.
About Delaware County, PA
What distinguishes Delaware County is density: among the most densely settled of US counties, around 3,135 people per square mile. Delaware County is a county in Pennsylvania with a population of 576,195. It is the #5-largest of all counties in Pennsylvania nationally.
Income is a real outlier — the median household pulls in $88,576, putting Delaware County near the top of US counties. Poverty runs at 7.4%, below the national 12.4%. A typical home is worth $302,400, with typical rent around $1,315.
Delaware County is among the best-educated US counties: 41.6% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. Remote work is widespread — 15.4% of workers stay home, above the national 14.0%, and the average commute runs about 28 minutes each way.
That density explains much of the rest of the profile in Delaware County: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Delaware County Population History (2010-2024)
The county of Delaware County had a population of 559,009 in 2010 and 584,882 in 2024, a 4.6% growth over 14 years. The peak was 584,882 in 2024. Average annual growth rate: 0.32%.
584,882
Population (2024)
559,009
Population (2010)
584,882
Peak (2024)
0.32%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 559,009 |
| 2011 | 559,338 |
| 2012 | 560,865 |
| 2013 | 561,635 |
| 2014 | 562,868 |
| 2015 | 563,434 |
| 2016 | 563,860 |
| 2017 | 564,015 |
| 2018 | 565,506 |
| 2019 | 566,506 |
| 2020 | 576,523 |
| 2021 | 577,126 |
| 2022 | 577,040 |
| 2023 | 580,538 |
| 2024 | 584,882 |
Race & Ethnicity
| White | 64.5% |
| Black or African American | 22.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Age & Sex
39.0
Median Age
51.6%
Female
48.4%
Male
17.0%
Age 65+
Age Distribution
Children (under 15): 18.1% · Seniors (65+): 17.0%
Income & Poverty
| Median household income | $88,576+$12,495 vs state |
| Mean household income | $126,081 |
| Per-capita income | $48,676 |
| Poverty rate | 7.4%-0.7% vs state |
| Unemployment rate | 4.5% |
| Employment-to-population | 61.3% |
Top Industries by Employment
The largest employment sector in Delaware County is professional & business services, accounting for 29.2% of workers.
How residents commute
6.7%
Drive alone
3.3%
Carpool
66.1%
Public transit
15.4%
Work from home
28.4 min
Avg commute
Housing
$302,400+$61,900 vs state
Median home value
$1,315
Median rent
69.6%
Homeownership rate
229,390
Total housing units
94.5%
Occupied
5.5%
Vacant
30.4%
Renter-occupied
Social & access
95.2%
With health insurance
95.6%
With broadband internet
17.8%
Foreign-born
5.1%
Veterans (18+)
12.1%
With a disability
86.5%
Speak language other than English at home
Education
93.6%
High School+
41.6%
Bachelor's+
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County rankings
Common questions about Delaware County, PA
Frequently Asked Questions
Delaware County, Pennsylvania has a population of 576,195 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 5th-largest county in Pennsylvania. Population density is 3135 people per square mile.
The population of Delaware County has grown 4.6% since 2010 (559,009 → 584,882), a +0.32% annualized rate.
The median household income in Delaware County, Pennsylvania is $88,576, with mean (average) household income of $126,081 and per-capita income of $48,676. 7.4% of residents live below the federal poverty level.
In Delaware County, the largest racial and ethnic groups are White (64.5%), Black or African American (22.0%), Hispanic or Latino (0.8%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Delaware County, Pennsylvania is 39.0 years. Residents are 51.6% female and 48.4% male.
The median home value in Delaware County is $302,400 and median monthly rent is $1,315. 69.6% of occupied housing units are owner-occupied. The county has 229,390 total housing units, 5.5% of which are vacant.
The largest employment sector in Delaware County, Pennsylvania is professional, scientific, and management services, employing 29.2% of workers. The unemployment rate is 4.5%.
Philadelphia is among the largest cities associated with Delaware County, Pennsylvania, with a population of 1,582,432.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.