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Union County, Ohio

Union County, Ohio
County
Union County
Union County Courthouse Marysville.jpg
Union County Courthouse
Flag of Union County, Ohio
Flag
Seal of Union County, Ohio
Seal
Map of Ohio highlighting Union County
Location in the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location in the U.S.
Founded April 1, 1820
Named for formed from the union of parts of surrounding counties
Seat Marysville
Largest city Marysville
Area
 • Total 437 sq mi (1,132 km2)
 • Land 432 sq mi (1,119 km2)
 • Water 5.1 sq mi (13 km2), 1.2%
Population
 • (2010) 52,300
 • Density 121/sq mi (47/km²)
Congressional district 4th
Time zone Eastern: UTC-5/-4
Website www.co.union.oh.us

Union County is a county located in the US state of Ohio. As of the 2010 census, the population was 52,300. Its county seat is Marysville. Its name is reflective of its origins, it being the union of portions of Franklin, Delaware, Madison, and Logan counties.

Union County is part of the Columbus, OH Metropolitan Statistical Area.

Union County has been under the rule of three countries in its history: France, England, and the present-day United States. It was discovered by the French explorer La Salle, along with traders and missionaries who accompanied him. After the French and Indian War, the Treaty of Paris of 1763 placed the area under British rule. Following the American Revolution, in 1783, the area would eventually become known as the Northwest Territory and part of the United States.

After the American Revolution, former soldiers from New England poured into Ohio after being granted land by the government. They surveyed the land, and sought to develop a state between Lake Erie and the Ohio River. Their proposals for the governance of the territory led to the passage of the Ordinance of 1787, which guided the establishment of states within the Northwestern Territory. Bitter struggles with American Indians over the next decades would follow, culminating with the battle of Tippecanoe in 1811, which saw the final defeat of the American Indian tribes in Ohio led by Tecumseh. A notable victim of the warring between the settlers and Indians was Jonathan Alder, who resided in and around the Union County area throughout his life.


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