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.
Delaware County, PA Climate
Delaware County, PA has an average annual temperature of 11.8°C (53°F) and receives about 1157 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
11.8°C
Avg Temp
1157
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -1° / 31° | 92 mm |
| February | 1° / 33° | 75 mm |
| March | 5° / 41° | 99 mm |
| April | 11° / 51° | 97 mm |
| May | 16° / 61° | 109 mm |
| June | 21° / 70° | 95 mm |
| July | 24° / 75° | 115 mm |
| August | 23° / 74° | 104 mm |
| September | 19° / 67° | 105 mm |
| October | 13° / 55° | 79 mm |
| November | 8° / 46° | 95 mm |
| December | 2° / 36° | 92 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Delaware County, PA
The most comfortable months to visit Delaware County, PA are typically June, September and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -5°C low). July is usually the wettest month.
Where to stay near Delaware County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.