New Hartford is a city in Butler County, Iowa, United States. The population was 570 at the time of the 2020 census. Geography New Hartford's longitude and latitude coordinates in decimal form are 42.567189, -92.621435. According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census At the 2010 census, there were 516 people, 215 households and 147 families living in the city. The population density was . There were 234 housing units at an average density of . The racial makeup of the city was 98.1% White, 0.4% Native American, 0.2% Asian, 0.4% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 1.6% of the population. There were 215 households, of which 30.7% had children under the age of 18 living with them, 53.5% were married couples living together, 10.7% had a female householder with no husband present, 4.2% had a male householder with no wife present, and 31.6% were non-families. 26.5% of all households were made up of individuals, and 9.8% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.83. The median age was 38.3 years. 25% of residents were under the age of 18; 5.7% were between the ages of 18 and 24; 27.8% were from 25 to 44; 28.6% were from 45 to 64; and 13% were 65 years of age or older. The population was 51.0% male and 49.0% female. 2000 census At the 2000 census, there were 659 people, 270 households and 196 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 98.63% White, 0.15% Native American, 0.15% Asian, 0.15% from other races, and 0.91% from two or more races. Hispanic or Latino of any race were 1.06% of the population. There were 270 households, of which 30.7% had children under the age of 18 living with them, 58.5% were married couples living together, 8.5% had a female householder with no husband present, and 27.4% were non-families. 22.6% of all households were made up of individuals, and 10.7% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was