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Hamilton County, Ohio

Hamilton County, Ohio
County
Hamilton County
Hamilton County Courthouse in Cincinnati, western front.jpg
Seal of Hamilton County, Ohio
Seal
Logo of Hamilton County, Ohio
Logo
Map of Ohio highlighting Hamilton County
Location in the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location in the U.S.
Founded January 2, 1790
Named for Alexander Hamilton
Seat Cincinnati
Largest city Cincinnati
Area
 • Total 413 sq mi (1,070 km2)
 • Land 406 sq mi (1,052 km2)
 • Water 6.7 sq mi (17 km2), 1.6%
Population (est.)
 • (2014) 806,631
 • Density 1,987/sq mi (767/km²)
Congressional districts 1st, 2nd
Time zone Eastern: UTC-5/-4
Website www.hamilton-co.org

Hamilton County is a county located in the southwest corner of the U.S. state of Ohio. As of the 2010 census, the population was 802,374. making it the third-most populous county in Ohio. The county seat is Cincinnati. The county is named for the first Secretary of the Treasury, Alexander Hamilton.

Hamilton County is part of the Cincinnati-Middletown, OH-KY-IN Metropolitan Statistical Area.

Most of Hamilton County was originally owned and surveyed by John Cleves Symmes, and the region was a part of the Symmes Purchase. The first European-American settlers rafted down the Ohio River in 1788 following the American Revolutionary War. They established the towns of Losantiville (later Cincinnati) and Cleves.

Hamilton County was organized in 1790, as the second county in the Northwest Territory. Its area then included about one-eighth of Ohio, and had about 2,000 inhabitants (not including the remaining Native Americans). The United States persuaded most of the Shawnee and other Indian peoples to remove in the 1820s to locations west of the Mississippi River.

Since then, other counties were created from Hamilton, reducing the county to its present size. Rapid growth occurred during the 1830s and 1840s as the area attracted many German and Irish immigrants, especially after the Great Famine in Ireland and the revolutions in Germany in 1848.


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