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Dauphin County Pennsylvania ☎ +1 717-780-6300 Last Updated: 10/16/2025 |
| Dauphin County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 286,401. The county seat is Harrisburg, Pennsylvania's state capital. The county is part of the South Central region of the commonwealth. | |
| 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. | |
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