Charter Oak is a city in Crawford County, Iowa, United States, along the East Soldier River. The population was 535 at the 2020 census. Geography Charter Oak is located at (42.067897, -95.589390). According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census As of the census of 2010, there were 502 people, 229 households, and 125 families living in the city. The population density was . There were 268 housing units at an average density of . The racial makeup of the city was 95.6% White, 0.6% African American, 1.4% Asian, 1.0% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 7.2% of the population. There were 229 households, of which 26.6% had children under the age of 18 living with them, 42.4% were married couples living together, 7.4% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 45.4% were non-families. 41.5% of all households were made up of individuals, and 18.3% had someone living alone who was 65 years of age or older. The average household size was 2.19 and the average family size was 2.94. The median age in the city was 42.5 years. 25.1% of residents were under the age of 18; 7.7% were between the ages of 18 and 24; 18.8% were from 25 to 44; 30.8% were from 45 to 64; and 17.9% were 65 years of age or older. The gender makeup of the city was 47.4% male and 52.6% female. 2000 census As of the census of 2000, there were 530 people, 245 households, and 149 families living in the city. The population density was . There were 275 housing units at an average density of . The racial makeup of the city was 99.62% White and 0.38% Asian. Hispanic or Latino of any race were 0.19% of the population. There were 245 households, out of which 24.9% had children under the age of 18 living with them, 53.9% were married couples living together, 4.9% had a female householder with no husband present, and 38.8% were non-families. 37.6% of all households were made up of individuals, and 23.3% had someone living alone who was 65 years of age or older. The average household size was 2.16 and the average family size was 2.83. In the city,