|— City —|
|Motto: "The Learning Community"|
|Montgomery County, Ohio|
|• Mayor||Joyce Deitering|
|• Council Members||Beverly Smith, Kenneth Henning, Tim Gorman, Greg Merkle, Ray Slone, Robert Peters|
|• Total||18.60 sq mi (48.17 km2)|
|• Land||18.51 sq mi (47.94 km2)|
|• Water||0.09 sq mi (0.23 km2)|
|Elevation||1,001 ft (305 m)|
|• Estimate (2011)||13,269|
|• Density||713.6/sq mi (275.5/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
|GNIS feature ID||1056811|
Clayton is a city in Montgomery and Miami counties in the U.S. state of Ohio. The population was 13,209 at the 2010 census. It is part of the Dayton Metropolitan Statistical Area. In 1998, Clayton merged with the remainder of Montgomery County's Randolph Township.
Clayton is located at (39.86066, -84.35508).
According to the United States Census Bureau, the city has a total area of 18.60 square miles (48.17 km2), of which, 18.51 square miles (47.94 km2) is land and 0.09 square miles (0.23 km2) is water.
2010 census 
As of the census of 2010, there were 13,209 people, 5,118 households, and 3,766 families residing in the city. The population density was 713.6 inhabitants per square mile (275.5 /km2). There were 5,423 housing units at an average density of 293.0 per square mile (113.1 /km2). The racial makeup of the city was 76.5% White, 18.8% African American, 0.2% Native American, 1.4% Asian, 0.6% from other races, and 2.5% from two or more races. Hispanic or Latino of any race were 1.4% of the population.
There were 5,118 households out of which 32.1% had children under the age of 18 living with them, 59.2% were married couples living together, 10.7% had a female householder with no husband present, 3.6% had a male householder with no wife present, and 26.4% were non-families. 22.7% of all households were made up of individuals and 7.8% 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 3.00.
The median age in the city was 42.6 years. 23.4% of residents were under the age of 18; 7.6% were between the ages of 18 and 24; 22.3% were from 25 to 44; 32.7% were from 45 to 64; and 14% were 65 years of age or older. The gender makeup of the city was 49.0% male and 51.0% female.
2000 census 
As of the census of 2000, there were 13,347 people, 4,975 households, and 3,850 families residing in the city. The population density was 723.7 people per square mile (279.5/km²). There were 5,193 housing units at an average density of 281.6 per square mile (108.7/km²). The racial makeup of the city was 87.14% White, 9.87% African American, 0.15% Native American, 1.45% Asian, 0.04% Pacific Islander, 0.30% from other races, and 1.03% from two or more races. Hispanic or Latino of any race were 0.90% of the population.
There were 4,975 households out of which 35.7% had children under the age of 18 living with them, 65.4% were married couples living together, 8.6% had a female householder with no husband present, and 22.6% were non-families. 19.2% of all households were made up of individuals and 6.5% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.05.
In the city the population was spread out with 26.9% under the age of 18, 6.7% from 18 to 24, 27.2% from 25 to 44, 28.0% from 45 to 64, and 11.2% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 97.9 males. For every 100 females age 18 and over, there were 94.7 males.
The median income for a household in the city was $60,625, and the median income for a family was $67,250. Males had a median income of $45,569 versus $29,261 for females. The per capita income for the city was $26,569. About 3.3% of families and 4.4% of the population were below the poverty line, including 5.9% of those under age 18 and 2.8% of those age 65 or over.
Clayton is served by Montgomery County's Northmont City School District, which operates the following schools:
- Northmont High School
- Northmont Middle School
- Englewood Elementary
- Englewood Hills Elementary
- Northmoor Elementary
- Northwood Elementary
- O. R. Edgington Elementary
- Union Elementary
Notable residents 
- Jesse "Pop" Haines - member of the Baseball Hall of Fame
- Johnnie Wilder, Jr. - former lead singer of the funk group Heatwave.
- Chris Hero - professional wrestler, ROH tag team champion Ring of Honor
In fiction 
Part of Ayn Rand's novel The Fountainhead is set at Clayton. In the early 1930s the novel's male protagonist, the controversial architect Howard Roark, gets a contract to build in Clayton the (fictional) Janer's Department Store, a five-storey building. Later on Roark's beloved, Dominique Francon, comes seeking him there, and feels that in a sense Clayton "belongs to her more than to any of its inhabitants" because her beloved is there.
- "US Gazetteer files 2010". United States Census Bureau. Retrieved 2013-01-06.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "American FactFinder". United States Census Bureau. Retrieved 2013-01-06.
- "Population Estimates". United States Census Bureau. Retrieved 2013-01-06.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "American FactFinder2". Retrieved 2010-03-20.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.