Dauphin County, Pennsylvania

Dauphin County
Dauphin County Courthouse in Harrisburg
Flag of Dauphin County
Official seal of Dauphin County
Map of Pennsylvania highlighting Dauphin County
Location within the U.S. state of Pennsylvania
Map of the United States highlighting Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°25′N 76°47′W / 40.41°N 76.79°W / 40.41; -76.79
Country United States
State Pennsylvania
FoundedMarch 4, 1785
Named forLouis Joseph, Dauphin of France
SeatHarrisburg
Largest townshipLower Paxton Township
Area
 • Total558 sq mi (1,450 km2)
 • Land525 sq mi (1,360 km2)
 • Water33 sq mi (90 km2)  5.9%
Population
 • Estimate 
(2023)
289,234
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district10th
Websitewww.dauphincounty.gov
DesignatedDecember 9, 1982[1]

Dauphin County (/ˈdɔːfɪn/; Pennsylvania Dutch: Daffin Kaundi) is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 286,401.[2] The county seat is Harrisburg,[3] Pennsylvania's state capital and ninth-most populous city. The county was created on March 4, 1785, from part of Lancaster County and was named after Louis Joseph, Dauphin of France,[4] the first son of King Louis XVI. The county is part of the South Central Pennsylvania region of the state.[a]

Dauphin County is included in the Harrisburg–Carlisle Metropolitan Statistical Area.

Located within the county is Three Mile Island Nuclear Generating Station, site of the 1979 nuclear core meltdown. The nuclear power plant closed in 2019.

  1. ^ "PHMC Historical Markers Search". Pennsylvania Historical and Museum Commission. Commonwealth of Pennsylvania. Archived from the original (Searchable database) on March 21, 2016. Retrieved January 25, 2014.
  2. ^ "2020 Census Demographic Data Map Viewer". The United States Census Bureau. Retrieved August 13, 2021.
  3. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
  4. ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. pp. 100.


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