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Knox County, Ohio facts for kids

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Knox County
Knox County
The Knox County Courthouse in 2013
The Knox County Courthouse in 2013
Flag of Knox County
Official seal of Knox County
Map of Ohio highlighting Knox County
Location within the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location within the U.S.
Country  United States
State  Ohio
Founded March 1, 1808
Named for Henry Knox
Seat Mount Vernon
Largest city Mount Vernon
 • Total 530 sq mi (1,400 km2)
 • Land 525 sq mi (1,360 km2)
 • Water 4.1 sq mi (11 km2)  0.8%%
 • Total 62,721
 • Density 118.3/sq mi (45.7/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Congressional district 7th

Knox County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 62,721. Its county seat is Mount Vernon. The county is named for Henry Knox, an officer in the American Revolutionary War who was later the first Secretary of War. Knox County comprises the Mount Vernon, OH Micropolitan Statistical Area, which is also included in the Columbus-Marion-Zanesville, OH Combined Statistical Area.


Knox County was formed from Fairfield County in 1808. A rich African American cultural heritage has existed in the county since its founding.


According to the U.S. Census Bureau, the county has a total area of 530 square miles (1,400 km2), of which 525 square miles (1,360 km2) is land and 4.1 square miles (11 km2) (0.8%) is water. Approximately 58% of the county is farmland and 28% is forested. Most of the county lies in the Glaciated Allegheny Plateau with rolling hills and valleys. Although the relief is not sharp, some elevations in the county reach over 1400 feet above sea level.

Adjacent counties


Historical population
Census Pop.
1810 2,149
1820 8,326 287.4%
1830 17,085 105.2%
1840 29,579 73.1%
1850 28,872 −2.4%
1860 27,735 −3.9%
1870 26,333 −5.1%
1880 27,431 4.2%
1890 27,600 0.6%
1900 27,768 0.6%
1910 30,181 8.7%
1920 29,580 −2.0%
1930 29,338 −0.8%
1940 31,024 5.7%
1950 35,287 13.7%
1960 38,808 10.0%
1970 41,795 7.7%
1980 46,304 10.8%
1990 47,473 2.5%
2000 54,500 14.8%
2010 60,921 11.8%
2020 62,721 3.0%
U.S. Decennial Census
1790–1960 1900–1990
1990–2000 2020

2010 census

As of the 2010 United States Census, there were 60,921 people, 22,607 households, and 15,693 families living in the county. The population density was 115.9 inhabitants per square mile (44.7/km2). There were 25,118 housing units at an average density of 47.8 per square mile (18.5/km2). The racial makeup of the county was 96.7% white, 0.8% black or African American, 0.6% Asian, 0.2% American Indian, 0.4% from other races, and 1.2% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population. In terms of ancestry, 30.5% were German, 14.4% were Irish, 13.9% were English, and 9.2% were American.

Of the 22,607 households, 32.4% had children under the age of 18 living with them, 55.2% were married couples living together, 9.7% had a female householder with no husband present, 30.6% were non-families, and 25.7% of all households were made up of individuals. The average household size was 2.54 and the average family size was 3.04. The median age was 38.3 years.

The median income for a household in the county was $45,655 and the median income for a family was $55,881. Males had a median income of $41,762 versus $30,836 for females. The per capita income for the county was $21,204. About 9.1% of families and 13.1% of the population were below the poverty line, including 18.8% of those under age 18 and 9.5% of those age 65 or over.


Map of Knox County Ohio With Municipal and Township Labels
Map of Knox County, Ohio with Municipal and Township Labels




  • Berlin
  • Brown
  • Butler
  • Clay
  • Clinton
  • College
  • Harrison
  • Hilliar
  • Howard
  • Jackson
  • Jefferson
  • Liberty
  • Middlebury
  • Milford
  • Miller
  • Monroe
  • Morgan
  • Morris
  • Pike
  • Pleasant
  • Union
  • Wayne

Census-designated places

Unincorporated communities


A large portion of Knox County's economy is based on agriculture, with gross cash receipts for crops and livestock at $110 million for 2011. Corn is the primary crop, followed by soybeans and livestock. Mount Vernon, the county seat, is home to major employers in the county, Siemens Energy Inc. (formerly Rolls-Royce Energy Systems, Inc. and Cooper Industries before that) and Ariel Corporation, both of which are manufacturers of components used in the natural gas industry. Major employers in the county also include Kenyon College located in Gambier, Mount Vernon Nazarene University in Mount Vernon, and the Kokosing Construction Company near Fredericktown.


  • Kenyon College
  • Mount Vernon Nazarene University
  • Central Ohio Technical College

Notable residents

See also

Kids robot.svg In Spanish: Condado de Knox (Ohio) para niños

National Hispanic Heritage Month on Kiddle
Influential Hispanic athletes
Jim Plunkett
Sammis Reyes
Carlos Arroyo
Trevor Ariza
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