County Maps US

Philadelphia County, Pennsylvania

The most populous of Pennsylvania's 67 counties.

CountyFIPS 42101

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

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Population
1,574,281
-26,456 (-1.7%) since 2020
Land area
134.3
square miles. A further 5.7% of the total area is water
Population density
11,720
people per square mile, computed rather than published
County seat
Philadelphia
Seat of county government.
Established
1682
343 years ago
Largest city
Philadelphia city
Population 1,574,281.

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 Philadelphia 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 Philadelphia 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 741 by 800 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 Philadelphia 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
Population1,574,2811st of 6725th of 3,144
Land area134.3 sq mi66th of 673,069th of 3,144
Population density11,720 per sq mi1st of 678th of 3,144
Median household income$61,95351st of 671,899th of 3,143

Full data for Philadelphia County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population1,574,281Vintage 2025 Population Estimates
Population in 20201,600,737Vintage 2025 Population Estimates
2020 estimates base?1,603,800Vintage 2025 Population Estimates
Land area134.3 sq mi2025 Gazetteer Files
Water area8.1 sq mi2025 Gazetteer Files
Total area142.4 sq mi2025 Gazetteer Files
Population density?11,720 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$61,953American Community Survey 2020-2024 5-Year Estimates
Median home value$243,100American Community Survey 2020-2024 5-Year Estimates
Median age35.3American Community Survey 2020-2024 5-Year Estimates
Households679,428American Community Survey 2020-2024 5-Year Estimates
Housing units748,270American 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
+3,992
18,315 births, 14,323 deaths
Net migration
-2,510
More people moved out than moved in.

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

The 6 areas bordering Philadelphia 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
Montgomery CountyPennsylvania29 mi877,643
Delaware CountyPennsylvania15 mi580,937
Bucks CountyPennsylvania11 mi647,828
Camden CountyNew Jersey9.6 mi535,799
Burlington CountyNew Jersey6.3 mi481,439
Gloucester CountyNew Jersey4.3 mi312,638

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.