Knierim is a city in Calhoun County, Iowa, United States. The population was 53 at the time of the 2020 census. History The city was founded by William and Wilhelmina Knierim in 1899, and incorporated in 1901. Geography According to the United States Census Bureau, the city has a total area of , all land. Knierim lies at the southeastern margin (rim) of Manson crater, an impact structure buried by glacial till and outwash. Demographics 2010 census As of the census of 2010, there were 60 people, 25 households, and 17 families living in the city. The population density was . There were 28 housing units at an average density of . The racial makeup of the city was 96.7% White, 1.7% from other races, and 1.7% from two or more races. Hispanic or Latino of any race were 5.0% of the population. There were 25 households, of which 36.0% had children under the age of 18 living with them, 64.0% were married couples living together, 4.0% had a male householder with no wife present, and 32.0% were non-families. 32.0% of all households were made up of individuals, and 20% 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 3.06. The median age in the city was 37.5 years. 31.7% of residents were under the age of 18; 0.0% were between the ages of 18 and 24; 28.3% were from 25 to 44; 23.4% were from 45 to 64; and 16.7% were 65 years of age or older. The gender makeup of the city was 53.3% male and 46.7% female. 2000 census As of the census of 2000, there were 70 people, 34 households, and 19 families living in the city. The population density was . There were 35 housing units at an average density of . The racial makeup of the city was 100.00% White. There were 34 households, out of which 17.6% had children under the age of 18 living with them, 52.9% were married couples living together, 2.9% had a female householder with no husband present, and 44.1% were non-families. 35.3% of all households were made up of individuals, and 14.7% had someone living alone who was 65 years of age or older. The average household size was 2.06 and the average family size was 2.68. In the city, the population was