What is the largest city in Delaware County, PA?

Chester is the largest city or town in Delaware County, with about 33,619 residents.

How many ZIP codes are in Delaware County?

Delaware County includes 38 ZIP Code Tabulation Areas, including 19008, 19013, 19014, 19015, 19017.

What is the population of Delaware County, PA?

About 579,222 people live in Delaware County, based on American Community Survey 5-year estimates.

What counties border Delaware County?

Delaware County borders Philadelphia County, Montgomery County, New Castle County, DE, Chester County, Gloucester County, NJ.

Delaware County, PA: Cities, ZIP Codes & Local Data

Population

579,222

Land area

184sq mi

People per sq mi

3,151

ZIP codes

38

Delaware County at a glance

Delaware County is about 11 times as dense as Pennsylvania as a whole.
It is the 5th most populous of 67 counties in Pennsylvania.
Households here earn a median of $89,546 a year, 15% more than the Pennsylvania figure of $77,971.
A typical owner-occupied home is valued at $332,200 (31% above Pennsylvania) and median rent is $1,372 a month.
The biggest population centers are Chester (33,619), Drexel Hill (30,451) and Yeadon (12,181).

Local data for Delaware County, PA

Counts from official public data

Housing and community stats

Delaware County, PA, American Community Survey 2020-2024

Full profile

Median household income

$89,546

Poverty rate

10.2%

Median home value

$332,200

Prices +4.7% in a year

Median rent

$1,372/mo

Homeownership

69.6%

Bachelor's or higher

41.9%

Median age

39.1

Average commute

28.1 min

Largest reported origins and ancestries: Irish Americans (128,710), Italian Americans (83,402), German Americans (68,523).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.0%

Aug 2026, -1.3 pts in a year

Average annual pay

$74,852

219,222 jobs, 2025

Income per person

$85,094

BEA, 2024

Federal spending

$5.92B

FY 2026, $10,262 per person

PPP loans

$1.48B

19,751 loans, 151,061 jobs reported

Campaign donations

$8.34M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Delaware County, PA, workers 16 and older. American Community Survey 5-year estimates

Drove alone64.4%
Carpooled6.6%
Public transit5.9%
Walked3.3%
Bicycle0.2%
Taxi, ride-hailing, motorcycle or other1.6%
Worked from home18.0%

Average one-way commute: 28.1 minutes for people who do not work from home.

Environment and hazard risk

Delaware County, PA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: winter weather

Storm events since 1996

1,313

Most often thunderstorm wind

Flood insurance policies

1,153

0.7% of homes, county

July high / Jan low

89° / 27°F

41.6 inches of rain a year

Hazards, floods and storm history Check a flood zone 56 historic places

Cities, towns and ZIP codes in Delaware County

Population shown

Frequently asked questions

What is the largest city in Delaware County, PA?: Chester is the largest city or town in Delaware County, with about 33,619 residents.
How many ZIP codes are in Delaware County?: Delaware County includes 38 ZIP Code Tabulation Areas, including 19008, 19013, 19014, 19015, 19017.
What is the population of Delaware County, PA?: About 579,222 people live in Delaware County, based on American Community Survey 5-year estimates.
What counties border Delaware County?: Delaware County borders Philadelphia County, Montgomery County, New Castle County, DE, Chester County, Gloucester County, NJ.