Dauphin County, Pennsylvania

County seat: Harrisburg · Population 293,351 (2025) · 525 sq mi

Dauphin County is the 14th most populous of Pennsylvania's 67 counties, with 293,351 people (2025 estimate). Its county seat is Harrisburg, which is also the state capital. It is part of the District 8 region, one of the 11 PennDOT engineering districts. The map shows its 17 cities and towns and the 8 neighboring counties.

Map of Dauphin County, Pennsylvania with cities, towns and the county boundary
Dauphin 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) 151 KBPNG image 133 KBPennsylvania county map

Dauphin County facts

County seat
Harrisburg
Population (2025 estimate)
293,351 +2.4% since 2020
Land area
525 sq mi 44th largest of 67
Water area
33 sq mi
Population density
559 per sq mi
Established
1785
Named after
Louis Joseph, Dauphin of France Prince of France (1781-1789)
Largest city
Lower Paxton 55,564
Median household income
$76,242
Cities and towns
17 plus 15 CDPs
ZIP codes
31
Time zone
Eastern
FIPS code
42043

Cities and towns in Dauphin County

Dauphin County has 17 incorporated cities, towns and villages. Populations count the people living inside Dauphin County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Harrisburg (county seat)City50,522
MiddletownBorough9,776
SteeltonBorough6,328
HummelstownBorough4,492
PenbrookBorough3,243
HighspireBorough2,725
MillersburgBorough2,540
LykensBorough1,856
PaxtangBorough1,632
ElizabethvilleBorough1,347
WilliamstownBorough1,298
RoyaltonBorough1,133
HalifaxBorough810
DauphinBorough790
GratzBorough750
BerrysburgBorough323
PillowBorough288

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Colonial Park18,032
Hershey14,242
Progress11,017
Linglestown6,957
Rutherford6,890
Lawnton4,765
Skyline View4,704
Paxtonia4,074
Bressler2,060
Palmdale1,542
Enhaut1,197
Union Deposit808
Lenkerville775
Wiconsico734
Oberlin269

ZIP codes in Dauphin County

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

Population of Dauphin County, 2020–2025

Dauphin County grew by 6,943 people (+2.4%) between April 2020 and July 2025: 1,978 more births than deaths and a net gain of 4,921 people from migration.

Year (July 1)Population
2020286,694
2021288,284
2022288,943
2023290,947
2024292,917
2025293,351

Neighboring counties

Printable Dauphin 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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