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Clinton County (Ohio)
Located in southwestern Ohio, the county was named for U.S. Vice-President George Clinton. The county seat is Wilmington.
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Erie County (Ohio)
Located along the shores of Lake Erie, in the center of Ohio's northern border, Erie County takes its name from the indigenous Erie people, as does the neighboring Great Lake. The county seat is Sandusky.
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Brown County (Ohio)
Located in southwestern Ohio, east of Cincinnati, Brown County was named for War of 1812 veteran Major General Jacob Brown. The county seat is Georgetown.
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Franklin County (Ohio)
Located in the center of Ohio, the county was named for Benjamin Franklin.
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Clark County (Ohio)
Located in western Ohio, the county is just northeast of Dayton, and the county seat is Springfield. The county was named for General George Rogers Clark, a prominent officer in the Indian Wars.
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Scioto County (Ohio)
The county is located in southern Ohio along the Ohio River and the boundary with Kentucky, and the county seat is Portsmouth. The county was named for the Scioto River. "Scioto" translates to "deer" in the local native language.
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Summit County (Ohio)
Located in northwestern Ohio, the county seat is Akron. The county was named for the high point along the Ohio Canal, Portage Summit, which is located within the county.
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Paulding County (Ohio)
Located in northwestern Ohio, along the boundary with Indiana, the county is 55 miles southwest of Toledo, and the county seat is Paulding. The county was named for John Paulding who assisted in capturing Major John Andre during the Revolutionary War.
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Warren County (Ohio)
Located in southwestern Ohio, the county is 20 miles south of Dayton, and the county seat is Lebanon. It was named for General Joseph Warren who died in the Battle of Bunker Hill.
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Preble County (Ohio)
Located in western Ohio along the boundary with Indiana, the county is 18 miles west of Dayton, and the county seat is Easton. The county was named for Captain Edward Preble, a Revolutionary War naval commander.
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Montgomery County (Ohio)
Located in western Ohio, the county is 70 miles west-southwest of Columbus, and the county seat is Dayton. The county was named for General Richard Montgomery who died in battle in Montreal, Quebec in 1775.
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Lucas County (Ohio)
Located in northwest Ohio along Lake Erie, and the boundary with Michigan, the county seat is Toledo. The county was named for Robert Lucas, who was governor of Ohio in the 1830s.
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Hamilton County (Ohio)
Named for Alexander Hamilton (1757-1804), the county is located in southwestern Ohio on the Ohio River along the boundaries with Kentucky and Indiana. The county seat is Cincinnati.
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Greene County (Ohio)
The county is located in southwestern Ohio, just west of Dayton, the county seat is Xenia. The county was named for Revolutionary war hero Nathaniel Greene (1742-1786).
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Cuyahoga County (Ohio)
Located in northern Ohio, along Lake Erie, the county seat is Cleveland. The county is named for the Cuyahoga River, which translates to "crooked river."
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Clermont County (Ohio)
Located in southwestern Ohio along the Ohio River, and the boundary with Kentucky, the county seat is Batavia. The word 'clermont' is French for 'clear mountain.'
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Butler County (Ohio)
Located in southwestern Ohio, along the boundary with Indiana, the county is 13 miles north of Cincinnati, the county seat is Hamilton. The county was named for General Richard Butler who was killed in battle in 1791.