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.
Harrisburg county
King William County, Virginia, has the oldest active courthouse. It was built in 1725. Queenstown, Maryland, has the oldest courthouse still standing. It was built in 1708. It is now a museum.
The County Court House is located in the County Seat, which is generally the oldest and often the largest city in that county. Note: In some southern States of the US, they use Parishes instead of Counties.
The Hook Lighthouse on Hook Head in county Wexford, is the oldest in Ireland and one of the oldest in the world.
carmarthen
answer is Glammorgan
the oldest valcano is in county Clare
the dixon California mayfair
The first US capital was Philadelphia. This would be the oldest capital of the US.
The oldest MTN. range in America is the Appalachian Mts. From edmonson county middle school.:)
The oldest city in West Virginia in Romney in Hampshire County. Chartered December 23 1762
The oldest sporting venue in the US is Saratoga Race Course.