County Maps US

Dauphin County, Pennsylvania

A county in Pennsylvania, ranked 14 of 67 by population.

CountyFIPS 42043

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

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Population
293,351
+6,657 (+2.3%) since 2020
Land area
524.9
square miles. A further 6.0% of the total area is water
Population density
559
people per square mile, computed rather than published
County seat
Harrisburg
Seat of county government.
Established
1785
240 years ago
Largest city
Harrisburg city
Population 50,522.

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 Dauphin 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 Dauphin 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 584 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 Dauphin 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
Population293,35114th of 67251st of 3,144
Land area524.9 sq mi44th of 671,994th of 3,144
Population density559 per sq mi10th of 67258th of 3,144
Median household income$76,24222nd of 67765th of 3,143

Full data for Dauphin County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population293,351Vintage 2025 Population Estimates
Population in 2020286,694Vintage 2025 Population Estimates
2020 estimates base?286,408Vintage 2025 Population Estimates
Land area524.9 sq mi2025 Gazetteer Files
Water area33.2 sq mi2025 Gazetteer Files
Total area558.1 sq mi2025 Gazetteer Files
Population density?559 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$76,242American Community Survey 2020-2024 5-Year Estimates
Median home value$236,400American Community Survey 2020-2024 5-Year Estimates
Median age39.4American Community Survey 2020-2024 5-Year Estimates
Households121,358American Community Survey 2020-2024 5-Year Estimates
Housing units127,828American 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
+558
3,228 births, 2,670 deaths
Net migration
-136
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 8 areas bordering Dauphin 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
Perry CountyPennsylvania30 mi46,806
Lebanon CountyPennsylvania30 mi146,380
Northumberland CountyPennsylvania18 mi89,920
Lancaster CountyPennsylvania14 mi563,159
York CountyPennsylvania12 mi473,197
Schuylkill CountyPennsylvania11 mi145,085
Cumberland CountyPennsylvania8.7 mi277,270
Juniata CountyPennsylvaniaa single point23,403

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

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.