County Maps US

Chester County, Pennsylvania

A county in Pennsylvania, ranked 7 of 67 by population.

CountyFIPS 42029

Within Pennsylvania
Chester County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks West Chester, the county seat, located via the 2025 Census Gazetteer.

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Population
557,116
+22,258 (+4.2%) since 2020
Land area
750.6
square miles. A further 1.1% of the total area is water
Population density
742
people per square mile, computed rather than published
County seat
West Chester
Seat of county government.
Established
1682
343 years ago
Largest city
Phoenixville borough
Population 20,356.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Chester County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Chester County, Pennsylvania from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 715 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Chester County ranks

Position among the 67 counties of Pennsylvania, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn PennsylvaniaNationally
Population557,1167th of 67131st of 3,144
Land area750.6 sq mi28th of 671,175th of 3,144
Population density742 per sq mi8th of 67208th of 3,144
Median household income$127,2081st of 6737th of 3,143

Full data for Chester County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population557,116Vintage 2025 Population Estimates
Population in 2020534,858Vintage 2025 Population Estimates
2020 estimates base?534,429Vintage 2025 Population Estimates
Land area750.6 sq mi2025 Gazetteer Files
Water area8.6 sq mi2025 Gazetteer Files
Total area759.2 sq mi2025 Gazetteer Files
Population density?742 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$127,208American Community Survey 2020-2024 5-Year Estimates
Median home value$485,600American Community Survey 2020-2024 5-Year Estimates
Median age40.8American Community Survey 2020-2024 5-Year Estimates
Households204,774American Community Survey 2020-2024 5-Year Estimates
Housing units212,491American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+1,173
5,527 births, 4,354 deaths
Net migration
+1,390
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Chester County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Lancaster CountyPennsylvania48 mi563,159
Montgomery CountyPennsylvania34 mi877,643
Delaware CountyPennsylvania31 mi580,937
Cecil CountyMaryland18 mi107,131
New Castle CountyDelaware15 mi588,026
Berks CountyPennsylvania12 mi440,072

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

Side by side

All 67 counties of Pennsylvania

Open the interactive Pennsylvania county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.