Clarksville is a city in Butler County, Iowa, United States, along the Shell Rock River. The population was 1,264 at the 2020 census. Geography Clarksville is located at 42°46'58" North, 92°40'11" West (42.782665, -92.669842). According to the United States Census Bureau, the city has a total area of , of which is land and is water. Demographics 2010 census As of the census of 2010, there were 1,439 people, 573 households, and 401 families living in the city. The population density was . There were 619 housing units at an average density of . The racial makeup of the city was 98.0% White, 0.1% African American, 0.2% Native American, 0.4% Asian, 0.1% Pacific Islander, 0.1% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 1.2% of the population. There were 573 households, of which 31.2% had children under the age of 18 living with them, 53.8% were married couples living together, 10.3% had a female householder with no husband present, 5.9% had a male householder with no wife present, and 30.0% were non-families. 25.5% of all households were made up of individuals, and 12.6% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.86. The median age in the city was 40.2 years. 24.7% of residents were under the age of 18; 7.1% were between the ages of 18 and 24; 23.8% were from 25 to 44; 24.1% were from 45 to 64; and 20% were 65 years of age or older. The gender makeup of the city was 47.9% male and 52.1% female. 2000 census As of the census of 2000, there were 1,441 people, 581 households, and 393 families living in the city. The population density was . There were 611 housing units at an average density of . The racial makeup of the city was 99.03% White, none Black or African American, 0.07% Native American, 0.21% Asian, none Pacific Islander, 0.14% from other races, and 0.56% from two or more races. 0.35% of the population were Hispanic or Latino of any race. There were 581 households, out of which 32.9% had children under the age of 18 living with them, 55.2% were married couples living together, 8.8% had a female householder with no husband present, and 32.2% were non-families. 28.7% of all households were