![]() The county is bound to its western border by the Susquehanna River (with the exception of a small peninsula next to Duncannon). Census Bureau, the county has a total area of 558 square miles (1,450 km 2), of which 525 square miles (1,360 km 2) is land and 33 square miles (85 km 2) (5.9%) is water. The nuclear power plant closed in 2019.Īccording to the U.S. Located within the county is Three Mile Island Nuclear Generating Station, site of the 1979 nuclear core meltdown. The county was created on March 4, 1785, from part of Lancaster County and was named after Louis Joseph, Dauphin of France, the first son of King Louis XVI.ĭauphin County is included in the Harrisburg–Carlisle Metropolitan Statistical Area. The county seat and the largest city is Harrisburg, Pennsylvania's state capital and ninth largest city. As of the 2020 census, the population was 286,401. ![]() Dauphin County ( / ˈ d ɔː f ɪ n/ Pennsylvania Dutch: Daffin Kaundi) is a county in the Commonwealth of Pennsylvania.
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