Hamilton County, Ohio

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Not to be confused with Hamilton, Ohio.
Hamilton County, Ohio
The 800 Broadway building in Cincinnati, where the Hamilton County Juvenile and Domestic Relations courts are housed
Seal of Hamilton County, Ohio
Logo of Hamilton County, Ohio
Map of Ohio highlighting Hamilton County
Location in the state of Ohio
Map of the United States highlighting Ohio
Ohio's location in the U.S.
Founded January 2, 1790[1]
Named for Alexander Hamilton
Seat Cincinnati
Largest city Cincinnati
 • Total 412.63 sq mi (1,069 km2)
 • Land 405.91 sq mi (1,051 km2)
 • Water 6.72 sq mi (17 km2), 1.63%
Population (Est.)
 • (2013) 804,520
 • Density 1,976.7/sq mi (763/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. The county seat is Cincinnati. According to the 2010 census, it has a population of 802,374,[2] making it the third-most populous county in Ohio. The county is named for the first Secretary of the Treasury, Alexander Hamilton.[3]

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.

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.


As of 2012, the members of the Hamilton Board of County Commissioners include Greg Hartmann, Chris Monzel, and Todd Portune. Since 1963, the Board has employed an administrator to run the day-to-day operations of the county; the current administrator is Christian Sigman.

Other elected officers include Dusty Rhodes (Auditor), Joe Deters (Prosecutor), Jim Neil (sheriff), Theodore B. Hubbard, (Engineer), Wayne Coates (Recorder), Robert A. Goering (Treasurer), and Lakshmi Sammarco (Coroner).

Seals of the Recorder and the Treasurer of Hamilton County

The elected Common Pleas Court include: Judge Nadine Allen, Judge Kim Wilson Burke, Judge Ethna M. Cooper, Judge Pat DeWine, Judge Dennis S. Helmick Judge Charles J. Kubicki, Jr., Judge Jody M. Luebbers, Judge Melba D. Marsh, Judge Steven E. Martin, Judge Jerome J. Metz, Jr., Judge Beth A. Myers Judge Norbert A. Nadel, Judge Robert P. Ruehlman, Judge John Andrew West, Judge Ralph E. Winkler, Judge Robert C. Winkler



According to the 2010 census, the county has a total area of 412.63 square miles (1,068.7 km2), of which 405.91 square miles (1,051.3 km2) (or 98.37%) is land and 6.72 square miles (17.4 km2) (or 1.63%) is water.[5]

Geographic features[edit]

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.

The county boundaries include the lowest point in Ohio, located 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.[6]

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

Adjacent counties[edit]


Further information: Transportation in Cincinnati

Major highways[edit]

Interstate 71, Interstate 74, Interstate 75, Interstate 471 and Interstate 275 serve the county. The Norwood Lateral and Ronald Reagan Highway are also prominent east-west thoroughfares in the county.


CSX Transportation, Norfolk Southern, RailAmerica, and Amtrak.[7]

Cincinnati, Ohio viewed from the SW, across the Ohio River, in Kentucky.


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. 2013 804,520 0.3%
U.S. Decennial Census[8]
2012 Estimate[2]

As of the 2000 census, there were 845,303 people, 346,790 households, and 212,582 families residing 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 72.93% White, 23.43% Black or African American, 0.18% Native American, 1.61% Asian, 0.03% Pacific Islander, 0.51% from other races, and 1.32% from two or more races. 1.13% 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.




Map of Hamilton County, Ohio with Municipal and Township Labels


Census-designated places[edit]

Other localities[edit]

† Only partially in Hamilton County


Public elementary and secondary education is provided by a number of independent school districts, supplemented by a county vocational school district, the Great Oaks Institute of Technology and Career Development. The 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. Cincinnati public schools are 71% African American while most suburban school districts are predominantly White.[citation needed]

Colleges and universities[edit]

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 Hamilton County Park District in 1949; it now spans 4,279 acres.


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 Hamilton County Park 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.

See also[edit]


  1. ^ "Ohio County Profiles: Hamilton County" (PDF). Ohio Department of Development. Retrieved 2007-04-28. 
  2. ^ a b "Hamilton County QuickFacts". United States Census Bureau. Retrieved 2012-02-16. 
  3. ^ "Hamilton County data". Ohio State University Extension Data Center. Archived from the original on 2007-12-03. Retrieved 2007-04-28. 
  4. ^ "Hamilton County Elected Officials". Retrieved 13 September 2012. 
  5. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23. 
  6. ^ "Markland". United States Army Corps of Engineers: Louisville District. Archived from the original on 2012-02-09. 
  7. ^ of Cincinnati
  8. ^ "U.S. Decennial Census". Census.gov. Retrieved November 5, 2013. 

External links[edit]

Coordinates: 39°12′N 84°32′W / 39.20°N 84.54°W / 39.20; -84.54