|Harrison County, Ohio|
Location within the U.S. state of Ohio
Ohio's location within the U.S.
|Founded||February 1, 1813  |
|Named for||William Henry Harrison|
|• Total||411 sq mi (1,064 km2)|
|• Land||402 sq mi (1,041 km2)|
|• Water||8.4 sq mi (22 km2), 2.1%|
|• ( 2010)||15,864|
|• Density||39/sq mi (15/km2)|
|Time zone||Eastern: UTC−5/ −4|
Harrison County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 15,864,  making it the fifth-least populous county in Ohio. Its county seat is Cadiz.  The county is named for General William Henry Harrison, who was later President of the United States. 
Harrison County was formed from parts of Jefferson and Tuscarawas Counties in 1813. The county was named after General William Henry Harrison, the hero of the battle of Tippecanoe in the War of 1812 <(and later to become the 9th US President).
On May 16, 2013 the Chicago Tribune Business section reported that the Utica Shale underlying Harrison County shows promise as a tight oil production zone.  To produce tight oil in large quantities would require horizontal drilling and fracturing of the shale formation as is being done in North Dakota and Texas.[ citation needed]
- Carroll County (north)
- Jefferson County (east)
- Belmont County (south)
- Guernsey County (southwest)
- Tuscarawas County (west)
The Conotton Creek Trail is a rails-to-trails path that runs along Conotton Creek from Bowerston to Jewett in northern Harrison County, Ohio. The paved multi-use trail is 11.4 miles or 18.3 kilometers long.
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2017 
As of the census  of 2000, there were 15,856 people, 6,398 households, and 4,516 families residing in the county. The population density was 39 people per square mile (15/km²). There were 7,680 housing units at an average density of 19 per square mile (7/km²). The racial makeup of the county was 96.49% White, 2.19% Black or African American, 0.08% Native American, 0.11% Asian, 0.01% Pacific Islander, 0.09% from other races, and 1.03% from two or more races. 0.37% of the population were Hispanic or Latino of any race.
There were 6,398 households out of which 29.1% had children under the age of 18 living with them, 58.5% were married couples living together, 8.8% had a female householder with no husband present, and 29.4% were non-families. 25.6% of all households were made up of individuals and 13% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.92.
In the county, the population was spread out with 23% under the age of 18, 6.9% from 18 to 24, 26.6% from 25 to 44, 25.8% from 45 to 64, and 17.7% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 94.1 males. For every 100 females age 18 and over, there were 89.9 males.
The median income for a household in the county was $30,318, and the median income for a family was $36,646. Males had a median income of $30,485 versus $18,813 for females. The per capita income for the county was $16,479. 13.3% of the population and 11% of families were below the poverty line. 17.5% of those under the age of 18 and 8.4% of those 65 and older were living below the poverty line.
As of the 2010 United States Census, there were 15,864 people, 6,526 households, and 4,452 families residing in the county.  The population density was 39.4 inhabitants per square mile (15.2/km2). There were 8,170 housing units at an average density of 20.3 per square mile (7.8/km2).  The racial makeup of the county was 95.9% white, 2.1% black or African American, 0.1% Asian, 0.1% American Indian, 0.1% from other races, and 1.6% from two or more races. Those of Hispanic or Latino origin made up 0.5% of the population.  In terms of ancestry, 20.9% were German, 15.5% were Irish, 9.0% were English, 8.9% were American, and 5.7% were Polish. 
Of the 6,526 households, 28.1% had children under the age of 18 living with them, 53.4% were married couples living together, 9.5% had a female householder with no husband present, 31.8% were non-families, and 27.1% of all households were made up of individuals. The average household size was 2.40 and the average family size was 2.88. The median age was 44.4 years. 
The median income for a household in the county was $35,363 and the median income for a family was $44,325. Males had a median income of $38,489 versus $24,063 for females. The per capita income for the county was $19,318. About 14.1% of families and 18.4% of the population were below the poverty line, including 26.3% of those under age 18 and 12.6% of those age 65 or over. 
- John Bingham - Representative to Congress and author of significant portions of the Fourteenth Amendment to the Constitution
- Benjamin Cowen - Assistant Secretary of the Interior, who was principal political facilitator in establishing Yellowstone National Park and the idea that the use of national parks is for all Americans
- George Custer - served in the American Civil War and was killed in the Battle of Little Big Horn
- Thomas Custer - Medal of Honor recipient, and brother to George Custer
- Clark Gable - actor
- Edwin Stanton - Secretary of War in the Abraham Lincoln administration
- Cy Young - Baseball pitcher and member of the Baseball Hall of Fame
- William Henry Holmes - anthropologist, archaeologist, geologist, and museum director
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- McAllister, Edward; Zawadzki, Sabina (May 16, 2013). "Ohio's well data shatters shale oil hopes". Chicago Tribune. Reuters. Retrieved May 20, 2013.
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- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 2018-05-02.