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Hamilton County is a county located in the southwestern 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 and largest city 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.

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

Hamilton County was organized in 1790 by order of Arthur St. Clair, governor of the Northwest Territory, as the second county in the Northwest Territory. Cincinnati was named as the seat. Residents named the county in honor of Alexander Hamilton, who was the first Secretary of the Treasury of the United States and a founder of the Federalist Party. Its original boundaries were those defined for the Symmes purchase contract in 1788: the Ohio River in the South, Great Miami River to the west, the Lesser Miami River to the east, and the Cayuhoga River to the North. Its area then included about one-eighth of Ohio, and had about 2,000 inhabitants (not including the remaining Native Americans). The county was greatly expanded in 1792 to include what is today the lower peninsula of Michigan. Since 1796, other counties were created from Hamilton, reducing the county to its present size.

The county was the location of much of the Northwest Indian War both before and after its organization.

The United States forcibly removed most of the Shawnee and other Indian peoples to move to locations west of the Mississippi River in the 1820s. 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.

During the Civil War, Morgan's Raid (a Confederate cavalry campaign from Kentucky) passed through the northern part of the county during the summer of 1863.


Ch?teau Laroche in Symmes Township lies in the Little Miami Valley.
According to the U.S. Census Bureau, the county has a total area of 413 square miles (1,070 km2), of which 406 square miles (1,050 km2) is land and 6.7 square miles (17 km2) (1.6%) is water.

Geographic features

Cincinnati, Ohio viewed from the SW, across the Ohio River, in Kentucky.
The county lies in a region of gentle hills formed by the slopes of the Ohio River valley and its tributaries. The Great Miami River, the Little Miami River, and the Mill Creek also contribute to this system of hillsides and valleys. No naturally occurring lakes exist, but three major manmade lakes are part of the Great Parks of Hamilton County. The largest lake by far is Winton Woods Lake, covering 188 surface acres, followed by Miami Whitewater Lake, covering 85 surface acres, and Sharon Lake, covering 36 surface acres.

The county boundaries include the lowest point in Ohio, in Miami Township, where the Ohio River flows out of Ohio and into Indiana. This is the upper pool elevation behind the Markland Dam, 455 feet (139 m) above sea level.

The highest land elevation in Hamilton County is the Rumpke Sanitary Landfill at 1,045 feet (319 m) above sea level in Colerain Township.

Major highways
US 22
US 27
US 42
US 50
US 52
US 127
SR 3
SR 4
SR 32
SR 125
SR 126
SR 128
SR 264
Historical population
Census Pop. %±
1800 14,692 —
1810 15,258 3.9%
1820 31,764 108.2%
1830 52,317 64.7%
1840 80,145 53.2%
1850 156,844 95.7%
1860 216,410 38.0%
1870 260,370 20.3%
1880 313,374 20.4%
1890 374,573 19.5%
1900 409,479 9.3%
1910 460,732 12.5%
1920 493,678 7.2%
1930 589,356 19.4%
1940 621,987 5.5%
1950 723,952 16.4%
1960 864,121 19.4%
1970 924,018 6.9%
1980 873,224 ?5.5%
1990 866,228 ?0.8%
2000 845,303 ?2.4%
2010 802,374 ?5.1%
Est. 2019 817,473 1.9%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2019
2000 census
As of the 2000 census, there were 845,303 people, 346,790 households, and 212,582 families living in the county. The population density was 2,075 people per square mile (801/km2). There were 373,393 housing units at an average density of 917 per square mile (354/km2). The racial makeup of the county was 69.2% White, 26.0% Black or African American, 0.1% Native American, 2.3% Asian, 0.01% Pacific Islander, 0.51% from other races, and 2.2% from two or more races. 2.8% of the population were Hispanic or Latino of any race.

There were 346,790 households, out of which 30.20% had children under the age of 18 living with them, 43.40% were married couples living together, 14.30% had a female householder with no husband present, and 38.70% were non-families. 32.90% of all households were made up of individuals, and 10.60% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 3.07.

Hamilton County property value, dollars per square foot-2011
In the county, the population was spread out, with 25.80% under the age of 18, 9.60% from 18 to 24, 29.70% from 25 to 44, 21.50% from 45 to 64, and 13.50% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 91.10 males. For every 100 females age 18 and over, there were 86.80 males.

The median income for a household in the county was $40,964, and the median income for a family was $53,449. Males had a median income of $39,842 versus $28,550 for females. The per capita income for the county was $24,053. About 8.80% of families and 11.80% of the population were below the poverty line, including 16.20% of those under age 18 and 8.70% of those age 65 or over.

2010 census
As of the 2010 United States Census, there were 802,374 people, 333,945 households, and 197,571 families living in the county. The population density was 1,976.7 inhabitants per square mile (763.2/km2). There were 377,364 housing units at an average density of 929.7 per square mile (359.0/km2). The racial makeup of the county was 68.8% white, 25.7% black or African American, 2.0% Asian, 0.2% American Indian, 0.1% Pacific islander, 1.1% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 2.6% of the population. In terms of ancestry, 31.0% were German, 14.7% were Irish, 7.7% were English, and 6.6% were American.

Of the 333,945 households, 29.7% had children under the age of 18 living with them, 39.4% were married couples living together, 15.4% had a female householder with no husband present, 40.8% were non-families, and 33.9% of all households were made up of individuals. The average household size was 2.34 and the average family size was 3.04. The median age was 37.1 years.

The median income for a household in the county was $48,234 and the median income for a family was $64,683. Males had a median income of $48,344 versus $37,310 for females. The per capita income for the county was $28,799. About 11.1% of families and 15.4% of the population were below the poverty line, including 22.9% of those under age 18 and 9.0% of those age 65 or over.

The County’s highest population was recorded in the 1970 U.S. Census. Since then, the County has lost population at an average rate of three percent per decade. Although Hamilton County is experiencing a decline in birth rates and has higher death rates in older age groups (cohorts), out-migration of residents is the key factor in population loss. In the last decade, this population loss has been reversed, and it is estimated that both Hamilton County and the City of Cincinnati have grown their populations. The Cincinnati Metropolitan Statistical Area, over the last three decades has seen a 19 percent increase in population. Much of the region’s growth has been through movement of Cincinnati and Hamilton County residents into neighboring counties.

See also: Ohio county government
As of 2020, the members of the Hamilton Board of County Commissioners are Denise Driehaus, Stephanie Summerow Dumas, and Victoria Parks.

Since 1963, the Board has employed an administrator to run the day-to-day operations of the county; the current administrator is Jeffrey Aluotto. Other elected officers include Dusty Rhodes (Auditor), Joe Deters (Prosecutor), Jim Neil (Sheriff), Theodore B. Hubbard, (Engineer), Norbert Nadel (Recorder), Robert A. Goering (Treasurer), and Lakshmi Sammarco (Coroner).

As of 2018, the elected Common Pleas Court include: Judge Charles J. Kubicki, Jr., Judge Lisa Allen, Judge Kim Wilson Burke, Judge Thomas O. Beridon, Judge Elizabeth A. Callan, Judge Ethna M. Cooper, Judge Patrick T. Dinkelacker, Judge J. Patrick Foley III, Judge Leslie Ghiz, Judge Tom Heekin, Judge Jody M. Luebbers, Judge Melba D. Marsh, Judge Jerome J. Metz, Jr., Judge Terry Nestor, Judge Robert P. Ruehlman, Judge Megan E. Shanahan.

Hamilton County historically elected Republican candidates in national elections, but has trended Democratic in recent years. In 2008, Barack Obama was the first Democratic presidential candidate to win the county since 1964. The county continued to lean Democratic, voting for Obama again in 2012 and for Democratic candidate Hillary Clinton in 2016. In fact, it was one of the few counties in Ohio to swing toward the Democrats in 2016 even as the state as a whole had swung toward the Republicans. In the 2018 midterm elections, with the election of Democrat Stephanie Summerow Dumas, the Hamilton County Board of Commissioners was completely under Democratic control for the first time ever. They had previously regained a 2/3rds majority control of the Board of Commissioners in 2016 with the election of Denise Driehaus. In 2019, longtime Democratic Commissioner Todd Portune announced his resignation from the Board due to health problems. Portune's Chief of Staff, Victoria Parks, was appointed to serve the remainder of his term (through the November 2020 general election). With Parks' appointment, the Board of Commissioners became for the first time all-female and majority black.

Due to its tight races and its position in the swing state of Ohio, Hamilton County is regarded as a crucial county to win in presidential elections. In 2012, The Washington Post named Hamilton as one of the seven most important counties in the country for that year's election. Time characterized Hamilton County's political scene as "a battle between conservative suburbs and a Democratic urban center, though Cincinnati is one of the most conservative metro areas in the Midwest."

Presidential election results
Further information: Education in Cincinnati

The University of Cincinnati was founded in 1819; The Engineering Research Center, designed by UC Alumnus Michael Graves, was designed to look like a 4-cylinder engine.

Miami Whitewater Forest was the second park to join the Great Parks of Hamilton County in 1949; it now spans 4,279 acres.
Public elementary and secondary education is provided by 22 school districts:

Cincinnati Public Schools
Deer Park Community City Schools District
Finneytown Local
Forest Hills Local School District
Indian Hill Exempted Village
Lockland City
Loveland City
Madeira City
Mariemont City
Mount Healthy City
North College Hill City
Northwest Local
Norwood City
Oak Hills Local
Princeton City
Reading City
Southwest Local
St. Bernard - Elmwood Place City
Sycamore Community
Three Rivers Local
Winton Woods City
Wyoming City
In 2016, Cincinnati Public Schools had 35,000 students, 63% of which were African-American. The county also has a vocational school district, the Great Oaks Institute of Technology and Career Development. Parochial schools of various denominations add to this base. Among these the Roman Catholic Archdiocese of Cincinnati maintains a system of 108 elementary and 22 secondary schools, the ninth largest private system in the United States.

Colleges and universities
Art Academy of Cincinnati
Athenaeum of Ohio
Mount St. Joseph University
Chatfield College
Cincinnati Christian University
Cincinnati College of Mortuary Science
Cincinnati State Technical and Community College
God's Bible School and College
Hebrew Union College
ITT Technical Institute
Mount St. Mary's Seminary of the West
Union Institute and University
University of Cincinnati
Xavier University
Further information: Transportation in Cincinnati
Major highways
Interstate 71, Interstate 74, Interstate 75, Interstate 471 and Interstate 275 serve the county. The Norwood Lateral and Ronald Reagan Cross County Highway are also prominent east-west thoroughfares in the county.

CSX Transportation, Norfolk Southern, RailAmerica, and Amtrak.

The county, in cooperation with the City of Cincinnati, operates the Public Library of Cincinnati and Hamilton County system with a main library and 41 branches. Major sports teams are listed under the communities in which they are located, primarily Cincinnati. The Great Parks of Hamilton County district resides within Hamilton County and maintains a series of preserves and educational facilities. Three of the largest parks within the system are Miami Whitewater Forest, Winton Woods, and Sharon Woods. The Hamilton County Fair is the oldest county fair in Ohio.


Map of Hamilton County, Ohio, with cities and villages in gray, and townships in colors
Blue Ash
Cincinnati (county seat)
Deer Park
Fairfield (part)
Forest Park
Village of Indian Hill
Loveland (part)
Milford (part)
Mount Healthy
North College Hill
Sharonville (part)
Arlington Heights
Elmwood Place
Golf Manor
Lincoln Heights
North Bend
St. Bernard
Terrace Park
Mill Creek (defunct)
Census-designated places
Blue Jay
Camp Dennison
Cherry Grove
Concorde Hills
Delhi Hills
Dry Ridge
Dry Run
Fruit Hill
Loveland Park (part)
Miami Heights
Monfort Heights
Mount Healthy Heights
New Baltimore
New Burlington
New Haven
Pleasant Hills
Pleasant Run
Pleasant Run Farms
Salem Heights
Sixteen Mile Stand
Skyline Acres
Taylor Creek
Turpin Hills
White Oak
Unincorporated communities
Colerain Heights
Mount Saint Joseph
Neighborhoods of Cincinnati
Main article: List of Cincinnati neighborhoods
Bond Hill
Camp Washington
College Hill
East End
East Price Hill
East Walnut Hills
East Westwood
English Woods
The Heights
Hyde Park
Kennedy Heights
Lower Price Hill
Mount Adams
Mount Airy
Mount Auburn
Mount Lookout
Mount Washington
North Avondale
North Fairmount
Paddock Hills
Pleasant Ridge
Sayler Park
South Cumminsville
South Fairmount
Spring Grove Village
Walnut Hills
West End
West Price Hill
Winton Hills

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