Clayton, Ohio  Clayton is a city in Montgomery county 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. The city was named after John Clayton, a War of 1812 veteran. Clayton is located at (39.86066, -84.35508). According to the United States Census Bureau, the city has a total area of , of which is land and is water. In 1998, Clayton annexed the remainder of Montgomery County's Randolph Township. Clayton was platted in 1816 and at that time was known as Salem. It suffered when the National Road bypassed it. In 1906 it became a stop on the Dayton Northern Traction Line. It became a city in 1998 through merger with the rest of Randolph Township, Montgomery County, Ohio. As of the census of 2010, there were 13,209 people, 5,118 households, and 3,766 families living in the city. The population density was . There were 5,423 housing units at an average density of . 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, 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. As of the census of 2000, there were 13,347 people, 4,975 households, and 3,850 families living in the city.