Chester County, Pennsylvania

County seat: West Chester · Population 557,116 (2025) · 751 sq mi

Chester County is the 7th most populous of Pennsylvania's 67 counties, with 557,116 people (2025 estimate). Its county seat is West Chester. It is part of the District 6 region, one of the 11 PennDOT engineering districts. The map shows its 16 cities and towns and the 6 neighboring counties.

Map of Chester County, Pennsylvania with cities, towns and the county boundary
Chester 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) 176 KBPNG image 138 KBPennsylvania county map

Chester County facts

County seat
West Chester
Population (2025 estimate)
557,116 +4.3% since 2020
Land area
751 sq mi 28th largest of 67
Water area
9 sq mi
Population density
742 per sq mi
Established
1682
Same name
One of 3 Chester Counties in the US
Named after
Chester city in Cheshire, England
Largest city
Tredyffrin 31,818
Median household income
$127,208
Cities and towns
16 plus 31 CDPs
ZIP codes
46
Time zone
Eastern
FIPS code
42029

Cities and towns in Chester County

Chester County has 16 incorporated cities, towns and villages. Populations count the people living inside Chester County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
PhoenixvilleBorough20,356
West Chester (county seat)Borough19,591
CoatesvilleCity13,283
DowningtownBorough8,384
Kennett SquareBorough6,893
OxfordBorough5,887
ParkesburgBorough3,976
Spring CityBorough3,878
MalvernBorough3,427
West GroveBorough2,835
Honey BrookBorough1,891
South CoatesvilleBorough1,773
AtglenBorough1,403
ElversonBorough1,396
AvondaleBorough1,264
ModenaBorough542

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Lionville7,683
Exton6,772
Paoli6,362
Chesterbrook5,839
Thorndale3,854
Berwyn3,680
Frazer3,389
Caln2,220
Eagleview2,050
Lincoln University2,017
Kenilworth2,013
South Pottstown1,893
Devon1,806
Hayti1,803
Nottingham1,508
Westwood1,501
Chadds Ford1,297Delaware County
Pughtown1,125
Dilworthtown1,066Delaware County
Sadsburyville967
Glenmoore910
Pomeroy856
Toughkenamon804
Unionville652
Cochranville590
Marshallton438
Eagle413
Kimberton377
Hamorton138
Cambridge36Lancaster County
Cheyney University0Delaware County

ZIP codes in Chester County

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

Population of Chester County, 2020–2025

Chester County grew by 22,687 people (+4.3%) between April 2020 and July 2025: 5,686 more births than deaths and a net gain of 16,987 people from migration.

Year (July 1)Population
2020534,858
2021541,131
2022547,131
2023551,316
2024554,530
2025557,116

Neighboring counties

Printable Chester 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.

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Sources

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