Delaware County, Pennsylvania

County seat: Media · Population 580,937 (2025) · 184 sq mi

Delaware County is the 5th most populous of Pennsylvania's 67 counties, with 580,937 people (2025 estimate). Its county seat is Media. It is part of the District 6 region, one of the 11 PennDOT engineering districts. The map shows its 28 cities and towns and the 5 neighboring counties.

Map of Delaware County, Pennsylvania with cities, towns and the county boundary
Delaware County, Pennsylvania with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 165 KBPNG image 126 KBPennsylvania county map

Delaware County facts

County seat
Media
Population (2025 estimate)
580,937 +0.7% since 2020
Land area
184 sq mi 65th largest of 67
Water area
7 sq mi
Population density
3,161 per sq mi
Established
1789
Same name
One of 6 Delaware Counties in the US
Named after
Delaware River major river on the East coast of the United States of America
Largest city
Upper Darby 85,458
Median household income
$89,546
Cities and towns
28 plus 18 CDPs
ZIP codes
45
Time zone
Eastern
FIPS code
42045

Cities and towns in Delaware County

Delaware County has 28 incorporated cities, towns and villages. Populations count the people living inside Delaware County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
ChesterCity33,996
YeadonBorough12,320
LansdowneBorough11,141
DarbyBorough10,666
CollingdaleBorough8,898
BrookhavenBorough8,362
Ridley ParkBorough7,255
GlenoldenBorough7,217
Clifton HeightsBorough6,835
FolcroftBorough6,780
SwarthmoreBorough6,561
Prospect ParkBorough6,409
Sharon HillBorough5,995
NorwoodBorough5,927
Media (county seat)Borough5,920
AldanBorough4,253
Chester HeightsBorough3,183
UplandBorough3,049
MortonBorough2,768
East LansdowneBorough2,703
ColwynBorough2,465
EddystoneBorough2,448
Marcus HookBorough2,448
ParksideBorough2,320
TrainerBorough1,972
MillbourneBorough1,210
Rose ValleyBorough1,017
RutledgeBorough779

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Drexel Hill30,451
Broomall10,679
Woodlyn9,736
Village Green-Green Ridge9,073
Folsom8,671
Villanova7,329Montgomery County
Wayne6,635
Ardmore5,284Montgomery County
Boothwyn4,774
Linwood3,921
St. Davids3,875
Lima2,812
Rosemont2,132Montgomery County
Haverford College1,554Montgomery County
Bryn Mawr1,534Montgomery County
Cheyney University308Chester County
Chadds Ford44Chester County
Dilworthtown24Chester County

ZIP codes in Delaware County

45 ZIP codes reach into Delaware County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Delaware County, 2020–2025

Delaware County grew by 3,975 people (+0.7%) between April 2020 and July 2025: 2,404 more births than deaths and a net gain of 1,116 people from migration.

Year (July 1)Population
2020576,505
2021577,178
2022576,666
2023579,086
2024581,416
2025580,937

Neighboring counties

Printable Delaware County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

Paste this code to embed the map on your site:

Sources

Back to the Pennsylvania county map with all 67 counties. Found an error? Tell us.