|Clinton County, Ohio|
Location within the U.S. state of Ohio
Ohio's location within the U.S.
|Founded||March 1, 1810 |
|Named for||George Clinton|
|• Total||412 sq mi (1,067 km2)|
|• Land||409 sq mi (1,059 km2)|
|• Water||3.6 sq mi (9 km2), 0.9%|
|• ( 2010)||42,040|
|• Density||103/sq mi (40/km2)|
|Time zone||Eastern: UTC−5/ −4|
Clinton County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 42,040.  The county seat is Wilmington.  The county is named for former U.S. Vice President George Clinton. 
Clinton County was formed on February 19, 1810 from sections of Highland County and Warren County. It was named after George Clinton, a soldier, politician, Governor of New York, and Vice President of the United States. According to The Descendants of William Sabin, compiled by Gordon Alan Morris, Thomas J. Prittie, and Dixie Prittie, one of the first Caucasian children born in the county was Mary Stuart Sabin, daughter of Dr. Warren Sabin, c. 1812. Genealogical records also indicate Williston T. Mendenhall was born in Clarksville, Clinton County on 24 November 1811.
The entire county lies within the Little Miami River watershed, with the exception of extreme eastern areas, which are within the Scioto River watershed. Clinton County lies within the till plains physiographic region, and is somewhat flat or gently rolling. The northern two thirds of the county were covered with an ice sheet during the Wisconsinan Stage, while the southern third was covered by ice sheets during the much older Illinoian Stage. Because of such a history with ice, glacial features are readily found on the landscape, such as moraines and kames.
The general elevation of the county is roughly 1,050 feet (320 m) above sea level, and there are few areas in the county that deviate from this more than 200 feet (61 m).
The climate of Clinton County can be classified as humid continental. It is one of the coolest and wettest counties in southern Ohio, although differences between it and other southern Ohio counties are usually very slight. Clinton County averages 42 inches (1,100 mm) of precipitation per year, including 30 inches (760 mm) of snow (Note: 1 inch of snow does not equal one inch of precipitation). Average July high temperatures reach the mid and upper 80s F although temperatures above 90 F are common, while lows are typically in the 60s F. January high temperatures typically reach the low and mid 30s F, while lows generally bottom out in the 10s F, although lows in the single digits and even below 0 F are common.
Interstate 71 crosses the northern third of the county, trending northeast to southwest and connecting Clinton County to Columbus, Ohio and Cincinnati. Clinton County is part of the Cincinnati- Middletown-Wilmington Combined Statistical Area, although there is little true urban activity in the county. U.S. Route 68 is the major north-south route through the county, while U.S. Route 22 runs east-west. Several other state and local highways serve the residents of Clinton County.
- Greene County (north)
- Fayette County (northeast)
- Highland County (southeast)
- Brown County (south)
- Clermont County (southwest)
- Warren County (west)
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2017 
As of the census of 2000, there were 40,543 people, 15,416 households, and 11,068 families residing in the county. The population density was 99 people per square mile (38/km²). There were 16,577 housing units at an average density of 40 per square mile (16/km²). The racial makeup of the county was 95.99% White, 2.19% Black or African American, 0.26% Native American, 0.38% Asian, 0.20% from other races, and 0.97% from two or more races. 0.66% of the population were Hispanic or Latino of any race. 29.3% were of American, 22.2% German, 12.1% English and 10.9% Irish ancestry according to 2000 census.
In 2005 94.7% of the county's population was non-Hispanic whites. Latinos were 1.3% of the population.
There were 15,416 households out of which 34.70% had children under the age of 18 living with them, 57.40% were married couples living together, 10.10% had a female householder with no husband present, and 28.20% were non-families. 23.70% of all households were made up of individuals and 9.90% 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 26.40% under the age of 18, 10.20% from 18 to 24, 29.10% from 25 to 44, 22.10% from 45 to 64, and 12.20% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 96.10 males. For every 100 females age 18 and over, there were 92.70 males.
The median income for a household in the county was $40,467, and the median income for a family was $48,158. Males had a median income of $34,448 versus $23,846 for females. The per capita income for the county was $18,462. About 6.40% of families and 8.60% of the population were below the poverty line, including 9.90% of those under age 18 and 11.60% of those age 65 or over.
As of the 2010 United States Census, there were 42,040 people, 16,210 households, and 11,364 families residing in the county.  The population density was 102.9 inhabitants per square mile (39.7/km2). There were 18,133 housing units at an average density of 44.4 per square mile (17.1/km2).  The racial makeup of the county was 94.7% white, 2.2% black or African American, 0.5% Asian, 0.2% American Indian, 0.5% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population.  In terms of ancestry, 26.4% were German, 15.4% were Irish, 12.0% were American, and 11.9% were English. 
Of the 16,210 households, 33.5% had children under the age of 18 living with them, 52.9% were married couples living together, 11.9% had a female householder with no husband present, 29.9% were non-families, and 25.1% of all households were made up of individuals. The average household size was 2.52 and the average family size was 2.99. The median age was 38.7 years. 
The median income for a household in the county was $46,261 and the median income for a family was $56,208. Males had a median income of $42,134 versus $31,380 for females. The per capita income for the county was $22,163. About 11.2% of families and 14.0% of the population were below the poverty line, including 18.6% of those under age 18 and 7.9% of those age 65 or over. 
Clinton County is a strongly Republican county: since at least 1880 the only Democrat to win a majority in the county has been Lyndon Johnson in 1964, and he did so by only four hundred and thirty-two votes.
The Clinton County Courthouse was built in 1915 in Wilmington. The courthouse is located at 53 E. Main Street.
The Wilmington Public Library of Clinton County serves the communities of Clinton County from its administrative offices and main library in Wilmington and its Clinton Massie branch in Clarksville. In 2005, the library loaned more than 161,000 items to its 17,000 cardholders. Total holdings as of 2005 were over 64,000 volumes with over 90 periodical subscriptions. 
The following school districts have territory in Clinton County. Those primarily in Clinton are in bold, those primarily in other counties are in italics. The county a district is primarily located in is bolded.
- Blanchester Local School District (also in Brown, Clermont, and Warren)
- Clinton Massie Local School District (also in Warren)
- East Clinton Local (also in Fayette, Greene, and Highland)
- Fairfield Local School District (also in Highland)
- Fayetteville-Perry Local School District (also in Brown)
- Greeneview Local School District (also in Greene)
- Lynchburg-Clay Local School District (also in Highland)
- Miami Trace Local School District (also in Fayette)
- Wilmington City School District (also in Greene)
- Xenia City School District (also in Greene and Warren)
Clinton County is home to Cowan Lake State Park, where outdoor recreationalists enjoy fishing, swimming, boating, hiking, bicycling, camping, and wildlife viewing. The northwestern border of Clinton County is formed by Caesar Creek Lake, which is part of Caesar Creek State Park. Fossil hunting is popular here, in addition to similar activities enjoyed at Cowan Lake. Wilmington College in Wilmington has several NCAA Division III athletic programs, whose events can be attended by the public. The city is also the home of the Clinton County Corn Festival.
In terms of professional sports, Clinton County is firmly within the Cincinnati market. Many residents are supporters of the baseball Cincinnati Reds and football Cincinnati Bengals. Cincinnati is a one-hour or less drive away for nearly all Clinton County residents.
- Wilmington (county seat)
- "Ohio County Profiles: Clinton County" (PDF). Ohio Department of Development. Archived from the original ( PDF) on 2007-06-21. Retrieved 2007-04-28.
- "State & County QuickFacts". United States Census Bureau. Retrieved February 7, 2015.
- "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.
- Taylor, William Alexander (1899). Ohio Statesmen and Annals of Progress. Press of the Westbote Company. p. 244.
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Archived from the original on May 4, 2014. Retrieved February 7, 2015.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "U.S. Decennial Census". United States Census Bureau. Archived from the original on May 12, 2015. Retrieved February 7, 2015.
- "Historical Census Browser". University of Virginia Library. Retrieved February 7, 2015.
- Forstall, Richard L., ed. (March 27, 1995). "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved February 7, 2015.
- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. April 2, 2001. Retrieved February 7, 2015.
- "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Retrieved 2015-12-27.
- "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Retrieved 2015-12-27.
- "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-12-27.
- "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-12-27.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 2018-05-01.
- "2005 Ohio Public Library Statistics:Statistics by County and Town". State Library of Ohio. Archived from the original on 2006-09-24. Retrieved October 3, 2006.
|Wikivoyage has a travel guide for Clinton County.|
- Clinton County Government's website
- Clinton County Ohio Convention and Visitor's Bureau
- Clinton County Genealogical and Historical Societies
- Wilmington Public Library of Clinton County website