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Union County is a county located in the US state of Ohio . As of the 2010 census , the population was 52,300. Increasingly becoming more of a suburban county, the population was estimated at 47,234 in 2007 by the U.S. Census Bureau . Its county seat is Marysville and its name is reflective of its origins, it being the union of pieces of Franklin , Delaware , Madison , and Logan Counties. Union County is part of the Columbus, Ohio Metropolitan Statistical Area .
Early history 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. 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. Robert de La Salle, French explorer of pre-modern Ohio After the American Revolution, revolutionary 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 would guide the Northwest Territory until the establishment of states that it called for. 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. Original settlements The first town laid out in the county was North Liberty, established by Lucas Sullivant in 1797, but the first settlement in the county was made in present-day Jerome township by Joshua and James Ewing in 1798.