The oldest county in the United States is York County, located in southern Maine. The county was established in 1636. Their web site is at: http://www.yorkcountyme.gov/
Actually the oldest counties in the country are in Virginia. Originally, there were 8 counties established in Virginia in 1634. Six of those counties remain in operation. These Six counties are as follow:
James City County VA
York County VA
Isle of Wight County VA
Accommack County VA
Henrico County VA
Charles County VA
Since James City County which encompasses the city of Jamestown (settled in 1607) was the first inhabited area with a formal government established; I would call this the oldest "county" in the country.
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