|Darke County, Ohio|
Location within the U.S. state of Ohio
Ohio's location within the U.S.
|Founded||March 1, 1817|
|Named for||William Darke|
|• Total||600 sq mi (1,554 km2)|
|• Land||598 sq mi (1,549 km2)|
|• Water||1.7 sq mi (4 km2), 0.3%|
|• ( 2010)||52,959|
|• Density||89/sq mi (34/km2)|
|Time zone||Eastern: UTC−5/ −4|
Darke County is a county in the U.S. state of Ohio. As of the 2010 census, the population was 52,959.  Its county seat is Greenville.  The county was created in 1809 and later organized in 1817.  It is named for William Darke, an officer in the American Revolutionary War. 
Notable county residents include Annie Oakley, famed 19th-century markswoman who performed with Buffalo Bill's Wild West show, who was born in Darke County, as was Lucullus Virgil McWhorter, a farmer and frontiersman who studied and wrote about the historical American Indian tribes of West Virginia and Ohio. After moving to Yakima, Washington, in 1903, he documented and became an advocate for the contemporary Yakama and Nez Perce peoples, and collected their oral histories. The travel author and broadcaster Lowell Thomas was born in Darke County.
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2017 
As of the census  of 2000, there were 53,309 people, 20,419 households, and 14,905 families residing in the county. The population density was 89 people per square mile (34/km²). There were 21,583 housing units at an average density of 36 per square mile (14/km²). The racial makeup of the county was 98.09% White, 0.39% Black or African American, 0.17% Native American, 0.25% Asian, 0.02% Pacific Islander, 0.34% from other races, and 0.74% from two or more races. 0.86% of the population were Hispanic or Latino of any race. 43.1% were of German, 20.1% American, 8.1% English, 6.8% Irish and 5.8% French ancestry according to Census 2000.
There were 20,419 households out of which 33.30% had children under the age of 18 living with them, 61.00% were married couples living together, 8.00% had a female householder with no husband present, and 27.00% were non-families. 23.50% of all households were made up of individuals, and 11.00% had someone living alone who was 65 years of age or older. The average household size was 2.56, and the average family size was 3.03.
In the county, the population was spread out with 26.30% under the age of 18, 7.80% from 18 to 24, 27.50% from 25 to 44, 23.20% from 45 to 64, and 15.30% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 96.10 males. For every 100 females age 18 and over, there were 93.30 males.
The median income for a household in the county was $39,307, and the median income for a family was $45,735. Males had a median income of $32,933 versus $23,339 for females. The per capita income for the county was $18,670. About 6.00% of families and 8.00% of the population were below the poverty line, including 10.10% of those under age 18 and 9.20% of those age 65 or over.
As of the 2010 United States Census, there were 52,959 people, 20,929 households, and 14,673 families residing in the county.  The population density was 88.5 inhabitants per square mile (34.2/km2). There were 22,730 housing units at an average density of 38.0 per square mile (14.7/km2).  The racial makeup of the county was 97.8% white, 0.4% black or African American, 0.3% Asian, 0.2% American Indian, 0.4% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population.  In terms of ancestry, 38.9% were German, 11.5% were American, 10.6% were Irish, and 9.0% were English. 
Of the 20,929 households, 31.9% had children under the age of 18 living with them, 56.7% were married couples living together, 9.0% had a female householder with no husband present, 29.9% were non-families, and 25.9% of all households were made up of individuals. The average household size was 2.50, and the average family size was 3.00. The median age was 40.8 years. 
The median income for a household in the county was $44,280, and the median income for a family was $53,454. Males had a median income of $40,402 versus $28,310 for females. The per capita income for the county was $21,483. About 7.5% of families and 10.6% of the population were below the poverty line, including 14.5% of those under age 18 and 8.1% of those age 65 or over. 
Darke County has a three-member Board of County Commissioners who oversee the various county departments, in similar fashion to all but two of the 88 Ohio counties. Darke County's elected commissioners are Mike Rhoades, Mike Stegall, and Matt Aultman. 
- Ansonia Local Schools
- Ansonia High School, Ansonia (the Tigers)
- Arcanum-Butler Local School District
- Arcanum High School, Arcanum (the Trojans)
- Franklin Monroe Schools
- Franklin Monroe Middle School/High School, Pitsburg (the Jets)
- Greenville City School District
- Greenville Senior High School, Greenville (the Green Wave)
- Mississinawa Valley Local School District
- Mississinawa Valley Junior/Senior High School, Union City (the Blackhawks)
- Tri-Village Local School District
- Tri-Village High School, New Madison (the Patriots)
- Versailles Exempted Village Schools
- Versailles High School, Versailles (the Tigers)
- Greenville (county seat)
- Fort Jefferson
- Hill Grove
- Hunchberger Corners
- New Harrison
- North Dayton
- Painter Creek
- Poplar Ridge
- Rose Hill
Darke County has 25 places listed on the National Register of Historic Places, including the Darke County Courthouse, Sheriff's House, and Jail and the Versailles Town Hall and Wayne Township House.
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- Frazer E. Wilson, History of Darke County, Ohio from Its Earliest Settlement to the Present Time: Also Biographical Sketches of Many Representative Citizens of the County. In Two Volumes. Milford, OH: Hobart Publishing Co., 1914. Volume 1 | Volume 2
- A Biographical History of Darke County, Ohio: Compendium of National Biography. Chicago: Lewis Publishing Co., 1900.
- The History of Darke County, Ohio Containing a History of the County; Its Cities, Towns, etc.; General and Local Statistics; Portraits of Early Settlers and Prominent Men; History of the Northwest Territory; History of Ohio; Map of Darke County; Constitution of the United States, Miscellaneous Matters, etc., etc. Chicago: W.H. Beers and Co., 1880.