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Clark County, Ohio facts for kids

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Clark County
Clark County courthouse
Official seal of Clark County
Map of Ohio highlighting Clark 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, 1818
Named for George Rogers Clark
Seat Springfield
Largest city Springfield
 • Total 403 sq mi (1,040 km2)
 • Land 397 sq mi (1,030 km2)
 • Water 5.1 sq mi (13 km2)  1.3%%
 • Total 136,001
 • Density 337.5/sq mi (130.30/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Congressional district 8th

Clark County is a county located in the west central portion of the U.S. state of Ohio. As of the 2020 census, the population was 136,001. Its county seat is Springfield. The county was created on March 1, 1818, and was named for General George Rogers Clark, a hero of the American Revolution.

Clark County comprises the Springfield, OH Metropolitan Statistical Area, which is also included in the Dayton-Springfield-Sidney-OH Combined Statistical Area.


According to the U.S. Census Bureau, the county has a total area of 403 square miles (1,040 km2), of which 397 square miles (1,030 km2) is land and 5.1 square miles (13 km2) (1.3%) is water. It is the third-smallest county in Ohio by total area.

Adjacent counties


Historical population
Census Pop.
1820 9,533
1830 13,114 37.6%
1840 16,882 28.7%
1850 22,178 31.4%
1860 25,300 14.1%
1870 32,070 26.8%
1880 41,948 30.8%
1890 52,277 24.6%
1900 58,939 12.7%
1910 66,435 12.7%
1920 80,728 21.5%
1930 90,936 12.6%
1940 95,647 5.2%
1950 111,661 16.7%
1960 131,440 17.7%
1970 157,115 19.5%
1980 150,236 −4.4%
1990 147,548 −1.8%
2000 144,742 −1.9%
2010 138,333 −4.4%
2020 136,001 −1.7%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2020

2010 census

As of the 2010 United States Census, there were 138,333 people, 55,244 households, and 36,906 families living in the county. The population density was 348.0 inhabitants per square mile (134.4/km2). There were 61,419 housing units at an average density of 154.5 per square mile (59.7/km2). The racial makeup of the county was 86.3% white, 8.8% black or African American, 0.6% Asian, 0.3% American Indian, 1.4% from other races, and 2.5% from two or more races. Those of Hispanic or Latino origin made up 2.8% of the population. In terms of ancestry, 25.3% were German, 15.0% were Irish, 13.8% were American, and 10.5% were English.

Of the 55,244 households, 31.1% had children under the age of 18 living with them, 47.5% were married couples living together, 14.1% had a female householder with no husband present, 33.2% were non-families, and 27.7% of all households were made up of individuals. The average household size was 2.45 and the average family size was 2.96. The median age was 40.5 years.

The median income for a household in the county was $44,141 and the median income for a family was $53,678. Males had a median income of $43,209 versus $30,811 for females. The per capita income for the county was $22,110. About 11.1% of families and 15.9% of the population were below the poverty line, including 24.5% of those under age 18 and 7.4% of those age 65 or over.

Metropolitan Statistical Area

The Springfield metropolitan area was first defined in 1950. Then known as the Springfield Standard Metropolitan Area (Springfield SMA), it consisted of a single county – Clark – and had a population of 111,661. Following a term change by the Bureau of the Budget (present-day Office of Management and Budget) in 1959, the Springfield SMA became the Springfield Standard Metropolitan Statistical Area (Springfield SMSA). By the census of 1960, the population had grown to 131,440, an 18 percent increase over the previous census. Champaign County was added to the Springfield SMSA in 1973. The two-county area had a combined population of 187,606 in 1970.

In 1983, the official name was shortened to the Springfield Metropolitan Statistical Area (Springfield MSA). That same year, Dayton and Springfield were grouped together as the Dayton-Springfield Metropolitan Statistical Area. The new MSA consisted of four counties – Clark, Greene, Miami, and Montgomery. This arrangement remained unchanged until 2003, when the MSA was split with Springfield's newly defined metropolitan area including only Clark County.


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




  • Bethel
  • German
  • Green
  • Harmony
  • Mad River
  • Madison
  • Moorefield
  • Pike
  • Pleasant
  • Springfield

Census-designated places

Unincorporated communities


Public school districts

    • Shawnee High School, Springfield (the Braves)
  • Greenon Local School District
    • Greenon High School, Springfield (the Knights)
    • Kenton Ridge High School, Springfield (the Cougars)
    • Northeastern High School, Springfield (the Jets)
    • Northwestern High School, Springfield (the Warriors)
    • Southeastern High School, South Charleston (the Trojans)
    • Springfield High School, (the Wildcats)
  • Tecumseh Local School District
    • Tecumseh High School, New Carlisle (the Arrows)

Colleges and Universities

    • Clark State Community College, Springfield (the Eagles)
    • Wittenberg University, Springfield (the Tigers)

See also

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